ORCID Profile
0000-0001-5327-2497
Current Organisation
Qatar University College of Engineering
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Publisher: American Chemical Society (ACS)
Date: 30-08-2022
DOI: 10.1021/ACS.LANGMUIR.2C01841
Abstract: Rational synthesis of Co-ZIF-67 metal-organic framework (MOF)-derived carbon-supported metal nanoparticles is essential for various energy and environmental applications however, their catalytic activity toward carbon monoxide (CO) oxidation in various electrolytes is not yet emphasized. Co-ZIF-67-derived hierarchical porous carbon nanosheet-supported Pd nanocrystals (Pd/ZIF-67/C) were prepared using a simple microwave-irradiation approach followed by carbonization and etching. Mechanistically, during microwave irradiation, triethyleneamine provides abundant reducing gases that promote the formation of Pd nanoparticles/Co-N
Publisher: Wiley
Date: 30-09-2021
Publisher: Wiley
Date: 04-10-2021
Abstract: Invited for this month's cover picture is the group of Prof. Dr. Kenneth I. Ozoemena at the University of the Witwatersrand and collaborators from Qatar University and Peking University. The Front Cover illustrates the significance of bifunctional electrocatalysis (ORR / OER) and zinc anode as the key drivers for the development of rechargeable zinc‐air batteries that promise to revolutionize electricity storage and applications (represented herein as electric vehicle charging point). Read the full text of the Review at 10.1002/celc.202100574 .
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02053D
Abstract: A facile method for one-pot synthesis of worm-like PtMo wavy nanowires under hydrogen pressure is developed. The as-made catalyst shows superior catalytic activity and durability towards the methanol oxidation reaction.
Publisher: American Chemical Society (ACS)
Date: 25-05-2022
Publisher: American Chemical Society (ACS)
Date: 20-07-2023
Publisher: Elsevier BV
Date: 06-2023
Publisher: Informa UK Limited
Date: 02-2011
DOI: 10.2147/IJN.S14309
Publisher: Elsevier BV
Date: 06-2020
Publisher: American Chemical Society (ACS)
Date: 11-01-2022
Abstract: The design of alternative earth-abundant van der Waals (vdW) nanoheterostructures for bifunctional oxygen evolution/reduction (OER/ORR) electrocatalysis is of paramount importance to fabricate energy-related devices. Herein, we report a simple metal-organic framework (MOF)-derived synthetic strategy to fabricate low-dimensional (LD) nanohybrids formed by zero-dimensional (0D) ZrO
Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 2022
Publisher: American Chemical Society (ACS)
Date: 15-07-2021
DOI: 10.1021/JACS.1C06579
Publisher: Springer Science and Business Media LLC
Date: 17-05-2016
DOI: 10.1038/SREP26196
Abstract: Tailoring the morphology of Pt nanocrystals (NCs) is of great concern for their enhancement in catalytic activity and durability. In this article, a novel synthetic strategy is developed to selectively prepare porous dendritic Pt NCs with different structures for oxygen reduction reaction (ORR) assisted by NH 3 gas and halides (F − , Cl − , Br − ). The NH 3 gas plays critical roles on tuning the morphology. Previously, H 2 and CO gas are reported to assist the shape control of metallic nanocrystals. This is the first demonstration that NH 3 gas assists the Pt anisotropic growth. The halides also play important role in the synthetic strategy to regulate the formation of Pt NCs. As-made porous dendritic Pt NCs, especially when NH 4 F is used as a regulating reagent, show superior catalytic activity for ORR compared with commercial Pt/C catalyst and other previously reported Pt-based NCs.
Publisher: Wiley
Date: 10-06-2016
Abstract: Engineering the size, composition, and morphology of platinum-based nanomaterials can provide a great opportunity to improve the utilization efficiency of electrocatalysts and reinforce their electrochemical performances. Herein, three-dimensional platinum-palladium hollow nanospheres with a dendritic shell (PtPd-HNSs) are successfully fabricated through a facile and economic route, during which SiO2 microspheres act as the hard template for the globular cavity, whereas the triblock copolymer F127 contributes to the formation of the dendritic shell. In contrast with platinum hollow nanospheres (Pt-HNSs) and commercial platinum on carbon (Pt/C) catalyst, the novel architecture shows a remarkable activity and durability toward the methanol oxidation reaction (MOR) owing to the coupled merits of bimetallic nanodendrites and a hollow interior. As a proof of concept, this strategy is also extended to trimetallic gold-palladium-platinum hollow nanospheres (AuPdPt-HNSs), which paves the way towards the controlled synthesis of other bi- or multimetallic platinum-based hollow electrocatalysts.
Publisher: MDPI AG
Date: 30-11-2022
Abstract: Direct alcohol fuel cells are deemed as green and sustainable energy resources however, CO-poisoning of Pt-based catalysts is a critical barrier to their commercialization. Thus, investigation of the electrochemical CO oxidation activity (COOxid) of Pt-based catalyst over pH ranges as a function of Pt-shape is necessary and is not yet reported. Herein, porous Pt nanodendrites (Pt NDs) were synthesized via the ultrasonic irradiation method, and its CO oxidation performance was benchmarked in different electrolytes relative to 1-D Pt chains nanostructure (Pt NCs) and commercial Pt/C catalyst under the same condition. This is a trial to confirm the effect of the size and shape of Pt as well as the pH of electrolytes on the COOxid. The COOxid activity and durability of Pt NDs are substantially superior to Pt NCs and Pt/C in HClO4, KOH, and NaHCO3 electrolytes, respectively, owing to the porous branched structure with a high surface area, which maximizes Pt utilization. Notably, the COOxid performance of Pt NPs in HClO4 is higher than that in NaHCO3, and KOH under the same reaction conditions. This study may open the way for understanding the COOxid activities of Pt-based catalysts and avoiding CO-poisoning in fuel cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA09471H
Abstract: We present a facile method for the rational design of highly exfoliated two-dimensional Ti 3 C 2 T x nanosheets (T x = O, OH, and F) doped with Cu (Cu/Ti 3 C 2 T x ) for electrochemical CO 2 reduction to formic acid at low Cu content of ∼1 wt%.
Publisher: Elsevier BV
Date: 02-2022
Publisher: Springer Science and Business Media LLC
Date: 28-08-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 10-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR08895C
Abstract: Bimetallic Pt-based nanodendrites are of particular interest in various catalytic applications due to their high surface areas and low densities. Herein, we provide a facile method for one-pot synthesis of PtRu nanodendrites via the co-reduction of Pt and Ru precursors in oleylamine by H
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9CY02366F
Abstract: Uniform and vertically aligned nanotube arrays of titanium oxynitride functionalized with iridium nanoparticles (Ir/TiON-NTs) were fabricated for the solar driven-water splitting.
Publisher: MDPI AG
Date: 22-09-2018
DOI: 10.3390/CATAL8100411
Abstract: Developing efficient catalyst for CO oxidation at low-temperature is crucial in various industrial and environmental remediation applications. Herein, we present a versatile approach for controlled synthesis of carbon nitride nanowires (CN NWs) doped with palladium and copper (Pd/Cu/CN NWs) for CO oxidation reactions. This is based on the polymerization of melamine by nitric acid in the presence of metal-precursors followed by annealing under nitrogen. This intriguingly drove the formation of well-defined, one-dimensional nanowires architecture with a high surface area (120 m2 g−1) and doped atomically with Pd and Cu. The newly-designed Pd/Cu/CN NWs fully converted CO to CO2 at 149 °C, that was substantially more active than that of Pd/CN NWs (283 °C) and Cu/CN NWs (329 °C). Moreover, Pd/Cu/CN NWs fully reserved their initial CO oxidation activity after 20 h. This is mainly attributed to the combination between the unique catalytic properties of Pd/Cu and outstanding physicochemical properties of CN NWs, which tune the adsorption energies of CO reactant and reaction product during the CO oxidation reaction. The as-developed method may open new frontiers on using CN NWs supported various noble metals for CO oxidation reaction.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ03411G
Abstract: A facile road-map is developed for one-pot synthesis of PtPd nanodendrite ornamented niobium oxynitride nanosheets for efficient solar-driven water splitting.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Informa UK Limited
Date: 03-2012
DOI: 10.2147/IJN.S26524
Publisher: Future Medicine Ltd
Date: 07-2014
DOI: 10.2217/NNM.13.89
Abstract: Background: The emergence of microbial resistance to antibiotics warrants the search for effective broad-spectrum antibacterial agents. Silver nanoparticles (AgNPs) have been used as antimicrobial agents. AgNPs encapsulated in nanolipososmes have been developed as effective antimicrobial agents. Materials & methods: Nanoliposomes ( nm) were prepared using a modified reverse-phase evaporation method, and spherical, dextrose-capped AgNPs were synthesized. The prepared liposome AgNPs (LAgNPs) were characterized, and tested for their antibacterial effects. Results: The size of LAgNPs is 25–80 nm. The release of AgNPs from nanoliposomes was sustained over 10 h. Complete growth inhibition of Eschericia coli, Salmonella enterica, Pseudomonas aeruginosa and Staphylococcus aureus was achieved using 180, 200, 160 and 120 µM, respectively, of LAgNPs. LAgNPs exhibited sustained broad-spectrum antibacterial effects compared with free AgNPs. Conclusion: Nanoliposomes loaded with AgNPs are potentially effective broad-spectrum antimicrobial agents. This new formula, which can be further fortified by encapsulation of additional established antibacterial agents, may be effective against antibiotic-resistant bacteria and also promote wound healing. Original submitted 30 May 2012 Revised submitted 3 April 2013
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.ENVRES.2022.112685
Abstract: Graphene-based nanomaterials with remarkable properties, such as good biocompatibility, strong mechanical strength, and outstanding electrical conductivity, have dramatically shown excellent potential in various applications. Increasing surface area and porosity percentage, improvement of adsorption capacities, reduction of adsorption energy barrier, and also prevention of agglomeration of graphene layers are the main advantages of functionalized graphene nanocomposites. On the other hand, Cerium nanostructures with remarkable properties have received a great deal of attention in a wide range of fields however, in some cases low conductivity limits their application in different applications. Therefore, the combination of cerium structures and graphene networks has been widely invesitaged to improve properties of the composite. In order to have a comprehensive information of these nanonetworks, this research reviews the recent developments in cerium functionalized graphene derivatives (graphene oxide (GO), reduced graphene oxide (RGO), and graphene quantum dot (GQD) and their industrial applications. The applications of functionalized graphene derivatives have also been successfully summarized. This systematic review study of graphene networks decorated with different structure of Cerium have potential to pave the way for scientific research not only in field of material science but also in fluorescent sensing, electrochemical sensing, supercapacitors, and catalyst as a new candidate.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 09-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1GC01303C
Abstract: This review summarises the structural-compositional engineering of carbon nitride (g-C 3 N 4 ) for electrocatalytic and photocatalytic CO 2 reduction to chemicals and fuels experimentally and theoretically.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00274K
Abstract: We tailored the defects of sub-100 nm multipodal titanium nitride/oxynitride nanotubes for the photocatalytic water splitting.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3CY00623A
Abstract: Rational fabrication of Ni-metal–organic-framework (MOF)-derived hollow N-doped carbon encapsulated Pd nanocrystals (Pd/Ni-MOF-HNC) has been demonstrated for efficient low-temperature CO oxidation, due to their outstanding catalytic and physicochemical merits.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9SC01586H
Abstract: Herein, we rationally fabricated three-dimensional upconversion core–double shell nanodendrites as efficient and safe luminescent probes for in vitro and in vivo bioimaging.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR04557F
Abstract: Porous bimetallic PtCu nanocrystals, which are highly active catalysts for the methanol oxidation reaction, are prepared by a one-step method.
Publisher: The Chemical Society of Japan
Date: 15-05-2021
Publisher: Elsevier BV
Date: 10-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2GC02748H
Abstract: This is the first review that emphasizes the engineering of carbon nitride-based catalysts for thermal, electrochemical, and photoelectrochemical CO oxidation reactions experimentally and theoretically.
Publisher: American Chemical Society (ACS)
Date: 19-09-2023
Publisher: MDPI AG
Date: 17-08-2022
DOI: 10.3390/NANO12162825
Abstract: Li-ion batteries (LIBs) and Na-ion batteries (SIBs) are deemed green and efficient electrochemical energy storage and generation devices meanwhile, acquiring a competent anode remains a serious challenge. Herein, the density-functional theory (DFT) was employed to investigate the performance of V4C3 MXene as an anode for LIBs and SIBs. The results predict the outstanding electrical conductivity when Li/Na is loaded on V4C3. Both Li2xV4C3 and Na2xV4C3 (x = 0.125, 0.5, 1, 1.5, and 2) showed expected low-average open-circuit voltages of 0.38 V and 0.14 V, respectively, along with a good Li/Na storage capacity of (223 mAhg−1) and a good cycling performance. Furthermore, there was a low diffusion barrier of 0.048 eV for Li0.0625V4C3 and 0.023 eV for Na0.0625V4C3, implying the prompt intercalation/extraction of Li/Na. Based on the findings of the current study, V4C3-based materials may be utilized as an anode for Li/Na-ion batteries in future applications.
Publisher: American Chemical Society (ACS)
Date: 04-02-2019
DOI: 10.1021/ACS.LANGMUIR.8B03588
Abstract: The precise fabrication of efficient catalysts for CO oxidation is of particular interest in a wide range of industrial and environmental applications. Herein, a scalable method is presented for the controlled synthesis of graphitic-like porous carbon nitride nanotubes (gC
Publisher: American Chemical Society (ACS)
Date: 16-07-2018
Publisher: Wiley
Date: 05-06-2015
Publisher: Elsevier BV
Date: 10-2023
Publisher: American Chemical Society (ACS)
Date: 15-06-2020
Publisher: Wiley
Date: 12-07-2021
Abstract: Rechargeable zinc‐air batteries (RZABs) are one of the most promising next‐generation energy‐storage technologies for stationary applications (home and industry), wearable and portable electronics, and transportation (including electric vehicles) due to their high energy density, environmental friendliness, safety, and low cost. However, RZABs still face serious challenges (such as sluggish oxygen reactions, poor durability, inferior reversibility of the zinc anode, and low cell energy efficiency) that conspire against their widespread commercialization. The reactions that occur at the three key components of the RZAB (air cathode, zinc anode, and electrolyte) co‐operatively conspire against its performance. Thus, this review focuses on the bifunctional electrocatalytic events at the cathode (i. e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)). That is in addition to the recent developments aimed at mitigating the performance‐limiting events at the anode and the electrolytes. This review directs the attention of researchers and users to the critical areas for the development of the next‐generation RZABs.
Publisher: MDPI AG
Date: 04-05-2020
DOI: 10.3390/NANO10050885
Abstract: Efficient approaches for toxic metal removal from wastewater have had transformative impacts to mitigating freshwater scarcity. Adsorption is among the most promising purification techniques due to its simplicity, low cost, and high removal efficiency at ambient conditions. MXene-based nanoarchitectures emerged as promising adsorbents in a plethora of toxic metal removal applications. This was due to the unique hydrophilicity, high surface area, activated metallic hydroxide sites, electron-richness, and massive adsorption capacity of MXene. Given the continual progress in the rational design of MXene nanostructures for water treatment, timely updates on this field are required that deeply emphasize toxic metal removal, including fabrication routes and characterization strategies of the merits, advantages, and limitations of MXenes for the adsorption of toxic metals (i.e., Pb, Cu, Zn, and Cr). This is in addition to the fundamentals and the adsorption mechanism tailored by the shape and composition of MXene based on some representative paradigms. Finally, the limitations of MXenes and their potential future research perspectives for wastewater treatment are also discussed. This review may trigger scientists to develop novel MXene-based nanoarchitectures with well-defined shapes, compositions, and physiochemical merits for efficient, practical removal of toxic metals from wastewater.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NJ04214K
Abstract: A one-pot method is developed for the synthesis of PdCu nanoframes which are an active catalyst for the methanol oxidation reaction.
Publisher: Elsevier BV
Date: 03-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3GC01071F
Abstract: MnFeM (M = Cu, Ti, and Co) active sites doped porous g-C 3 N 4 nanofibers were developed for efficient electrochemical green H 2 production. MnFeCu/g-C 3 N 4 NFs with higher synergism showed the best activity compared to others with less synergism.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3GC01790G
Abstract: We present a scalable one-pot strategy for the green fabrication of nitrogen-enriched graphitic-like hierarchical porous sub-100 nm carbon (denoted as N-HMPC) nanocapsules with controllable N-content for ORR experimentally and theoretically.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR07609F
Abstract: The electrocatalysts of porous PtPdRu nanodendrites and PtPdRu nanoflowers were obtained by a one-step ultrasonic irradiation method and magnetic stirring, respectively.
Publisher: American Chemical Society (ACS)
Date: 05-01-2021
DOI: 10.1021/JACS.0C12386
Publisher: American Chemical Society (ACS)
Date: 29-08-2022
Publisher: MDPI AG
Date: 06-05-2021
DOI: 10.3390/NANO11051226
Abstract: Catalytic methane decomposition (CMD) is a highly promising approach for the rational production of relatively COx-free hydrogen and carbon nanostructures, which are both important in multidisciplinary catalytic applications, electronics, fuel cells, etc. Research on CMD has been expanding in recent years with more than 2000 studies in the last five years alone. It is therefore a daunting task to provide a timely update on recent advances in the CMD process, related catalysis, kinetics, and reaction products. This mini-review emphasizes recent studies on the CMD process investigating self-standing/supported metal-based catalysts (e.g., Fe, Ni, Co, and Cu), metal oxide supports (e.g., SiO2, Al2O3, and TiO2), and carbon-based catalysts (e.g., carbon blacks, carbon nanotubes, and activated carbons) alongside their parameters supported with various ex les, schematics, and comparison tables. In addition, the review examines the effect of a catalyst’s shape and composition on CMD activity, stability, and products. It also attempts to bridge the gap between research and practical utilization of the CMD process and its future prospects.
Publisher: MDPI AG
Date: 12-2022
Abstract: Photocatalytic green hydrogen (H2) production through water electrolysis is deemed as green, efficient, and renewable fuel or energy carrier due to its great energy density and zero greenhouse emissions. However, developing efficient and low-cost noble-metal-free photocatalysts remains one of the daunting challenges in low-cost H2 production. Porous graphitic carbon nitride (gCN) nanostructures have drawn broad multidisciplinary attention as metal-free photocatalysts in the arena of H2 production and other environmental remediation. This is due to their impressive catalytic hotocatalytic properties (i.e., high surface area, narrow bandgap, and visible light absorption), unique physicochemical durability, tunable electronic properties, and feasibility to synthesize in high yield from inexpensive and earth-abundant resources. The physicochemical and photocatalytic properties of porous gCNs can be easily optimized via the integration of earth-abundant heteroatoms. Although there are various reviews on porous gCN-based photocatalysts for various applications, to the best of our knowledge, there are no reviews on heteroatom-doped porous gCN nanostructures for the photocatalytic H2 evolution reaction (HER). It is essential to provide timely updates in this research area to highlight the research related to fabrication of novel gCNs for large-scale applications and address the current barriers in this field. This review emphasizes a panorama of recent advances in the rational design of heteroatom (i.e., P, O, S, N, and B)-doped porous gCN nanostructures including mono, binary, and ternary dopants for photocatalytic HERs and their optimized parameters. This is in addition to H2 energy storage, non-metal configuration, HER fundamental, mechanism, and calculations. This review is expected to inspire a new research entryway to the fabrication of porous gCN-based photocatalysts with ameliorated activity and durability for practical H2 production.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 07-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA00533D
Abstract: A facile one-pot method is proposed for the synthesis of unique PtIr tripods with a dendritic surface which are an efficient catalyst for the oxygen reduction reaction.
Publisher: MDPI AG
Date: 14-10-2019
DOI: 10.3390/S19204442
Abstract: Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational design of ternary bentonite-silylpropyl-polypyrrole/silver nanoarchitectures (denoted as BP-PS-PPy/Ag) via the in-situ photo polymerization of pyrrole with salinized bentonite (BP-PS) in the presence of silver nitrate. The Pyrrolyl-functionalized silane (PS) is used as a coupling agent for tailoring the formation of highly exfoliated BP-PS-PPy sheet-like nanostructures ornamented with monodispersed Ag nanoparticles (NPs). Taking advantage of the combination between the unique physicochemical properties of BP-PS-PPy and the outstanding catalytic merits of Ag nanoparticles (NPs), the as-synthesized BP-PS-PPy/Ag shows a superior electrocatalytic reduction and high-detection activity towards H2O2 under different pH conditions (from 3 to 10). Intriguingly, the UV-light irradiation significantly enhances the electroreduction activity of H2O2 substantially, compared with the dark conditions, due to the high photoelectric response properties of Ag NPs. Moreover, BP-PS-PPy/Ag achived a quick current response with a detection limit at 1 μM within only 1 s. Our present approach is green, facile, scalable and renewable.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR02330J
Abstract: This review emphasizes the rational synthesis of porous spinel-type transition metal oxide nanostructures for electrocatalytic oxygen reduction reactions in various electrolytes.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NA00455K
Abstract: Ni-MOF-derived hierarchical porous carbon nanosheets (Ni-MOF/PC) decorated with Pd nanocrystals (Pd/Ni-MOF/PC) have high electrocatalytic CO oxidation activity in KOH, HClO 4 , and NaHCO 3 electrolytes than Pd/C and Pd/Ni-MOF/C.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CY00860K
Abstract: Porous binary PtPd, AuPt, PtCu, and PtNi nanodendrites prepared by a facile one-step reduction under ultrasonic irradiation at room temperature, exhibited a substantial catalytic activity towards glucose oxidation reaction at different pH values relative to a commercial Pt/C catalyst.
Publisher: Informa UK Limited
Date: 09-03-2016
Publisher: MDPI AG
Date: 25-09-2020
DOI: 10.3390/NANO10101916
Abstract: MXenes have emerged as promising materials for various mechanical applications due to their outstanding physicochemical merits, multilayered structures, excellent strength, flexibility, and electrical conductivity. Despite the substantial progress achieved in the rational design of MXenes nanostructures, the tutorial reviews on the mechanical properties of self-standing MXenes were not yet reported to our knowledge. Thus, it is essential to provide timely updates of the mechanical properties of MXenes, due to the explosion of publications in this filed. In pursuit of this aim, this review is dedicated to highlighting the recent advances in the rational design of self-standing MXene with unique mechanical properties for various applications. This includes elastic properties, ideal strengths, bending rigidity, adhesion, and sliding resistance theoretically as well as experimentally supported with various representative paradigms. Meanwhile, the mechanical properties of self-standing MXenes were compared with hybrid MXenes and various 2D materials. Then, the utilization of MXenes as supercapacitors for energy storage is also discussed. This review can provide a roadmap for the scientists to tailor the mechanical properties of MXene-based materials for the new generations of energy and sensor devices.
Publisher: MDPI AG
Date: 23-07-2023
Abstract: Tailoring the shape of Pd nanocrystals is one of the main ways to enhance catalytic activity however, the effect of shapes and electrolyte pH on carbon monoxide oxidation (COOxid) is not highlighted enough. This article presents the controlled fabrication of Pd nanocrystals in different morphologies, including Pd nanosponge via the ice-cooling reduction of the Pd precursor using NaBH4 solution and Pd nanocube via ascorbic acid reduction at 25 °C. Both Pd nanosponge and Pd nanocube are self-standing and have a high surface area, uniform distribution, and clean surface. The electrocatalytic CO oxidation activity and durability of the Pd nanocube were significantly superior to those of Pd nanosponge and commercial Pd/C in only acidic (H2SO4) medium and the best among the three media, due to the multiple adsorption active sites, uniform distribution, and high surface area of the nanocube structure. However, Pd nanosponge had enhanced COOxid activity and stability in both alkaline (KOH) and neutral (NaHCO3) electrolytes than Pd nanocube and Pd/C, attributable to its low Pd-Pd interatomic distance and cleaner surface. The self-standing Pd nanosponge and Pd nanocube were more active than Pd/C in all electrolytes. Mainly, the COOxid current density of Pd nanocube in H2SO4 (5.92 mA/cm2) was nearly 3.6 times that in KOH (1.63 mA/cm2) and 10.3 times that in NaHCO3 (0.578 mA/cm2), owing to the greater charge mobility and better electrolyte–electrode interaction, as evidenced by electrochemical impedance spectroscopy (EIS) analysis. Notably, this study confirmed that acidic electrolytes and Pd nanocube are highly preferred for promoting COOxid and may open new avenues for precluding CO poisoning in alcohol-based fuel cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3CY00253E
Abstract: Porous ternary Pd-based catalysts at low Pd mass exhibit inimitable surface area, accessible active sites, and tunable electronic structure advantageously utilized for high CO oxidation (CO oxid ) activity and stability in different electrolyte media.
Publisher: American Chemical Society (ACS)
Date: 12-08-2015
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02571E
Abstract: PtPd/CN nanorods synthesized via the rolling up mechanism enhanced the electrochemical and photoelectrochemical CO oxidation activity substantially at room temperature.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0GC01561J
Abstract: Edge-carboxylated graphene (ECG) crumpled nanosheets with tuneable COOH content were synthesized by a facile one pot approach for selective hydrolysis of cellulose to glucose and eucalyptus to xylose and glucose under ambient conditions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7SE00111H
Abstract: Perovskite oxide Pt–NiMnO 3 nanocrystals synthesized by a modified citrate-gel approach exhibited a superior catalytic activity and durability towards the oxygen evolution reaction over a wide range of pH values relative to available commercial Pt/C and NiMnO 3 nanocrystals.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NA90092K
Abstract: Correction for ‘Pd/Ni-metal–organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range’ by Adewale K. Ipadeola et al. , Nanoscale Adv. , 2022, 0.1039/d2na00455k.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 2016
Publisher: American Chemical Society (ACS)
Date: 09-09-2021
Publisher: Elsevier
Date: 2017
Publisher: Wiley
Date: 07-12-2017
Abstract: To develop low-cost and efficient oxygen reduction reaction (ORR) catalysts, a novel hybrid comprising cobalt-embedded nitrogen-doped carbon nanotubes and nitrogen-doped reduced graphene oxide (Co-NCNT/NrGO-800) was simply prepared by pyrolysis. The combination of nanotubes and graphene, and the efficient doping with cobalt and nitrogen, greatly contribute to the excellent ORR performance. This optimized Co-NCNT/NrGO catalyst exhibits a positive onset potential of 0.91 V and a half-wave potential of 0.82 V, combined with a relatively low peroxide yield, better durability, and better methanol tolerance than commercially available Pt/C, which makes it a promising candidate as a low-cost and effective non-precious-metal ORR catalyst.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA01981H
Abstract: Trimetallic Pt–Pd–Ru nanodendrites synthesized by a one-step route are highly active electrocatalysts for methanol oxidation reaction and oxygen reduction reaction.
Publisher: Springer Science and Business Media LLC
Date: 05-02-2020
DOI: 10.1186/S12302-020-0292-Z
Abstract: Carbon dots (CDs) are of particular interest in numerous applications. However, their efficiency for heavy metal removal from wastewater was not yet reported. Herein, we rationally synthesized CDs from petroleum coke waste via hydrothermal treatment in the presence of ammonia. This drove the formation of outstanding photoluminescent, water-soluble, biocompatible, and high yield of monodispersed sub-5 nm CDs. The CDs are co-doped with high 10% of N and 0.2% of S. The as-prepared CDs possess unprecedented photoluminescent properties over broad pH range making these dots unique efficient pH sensor. Chitosan (CH)–CDs hybrid hydrogel nanocomposite film was further prepared as a platform membrane for the removal Cd 2+ metal from wastewater. The as-prepared CH–CDs membranes show relatively good mechanical properties, based on stress resistance and flexibility to facilitate handling. The equilibrium state was reached within 5 min. Intriguingly, the UV-light illuminations enhanced the Cd 2+ removal efficiency of the photoluminescent CDs substantially by four times faster under. It was found that adsorption followed pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity at 25 °C was found to be 112.4 mg g −1 at pH 8. This work paves the way to new applications of CDs in water treatment.
Publisher: Wiley
Date: 18-03-2016
Abstract: Certain bimetallic nanocrystals (NCs) possess promising catalytic properties for electrochemical energy conversion. Herein, we report a facile method for the one-step synthesis of porous dendritic PtNi NCs in aqueous solution at room temperature that contrasts with the traditional multistep thermal decomposition approach. The dendritic PtNi NCs assembled by interconnected arms are efficient catalysts for the oxygen reduction reaction. This direct and efficient method is favorable for the up-scaled synthesis of active catalysts used in electrochemical applications.
Publisher: MDPI AG
Date: 21-06-2019
DOI: 10.20944/PREPRINTS201906.0211.V1
Abstract: The deaf impairment is among the most substantial health problem worldwide, that can lead to various personal, economical, and social crisis. Therefore, it is critical for developing an efficient way to facilitate communication between deaf-dumb impaired and normal people. Herein, we have rationally designed a new digitally computerized and mobile smart system as an efficient communication tool between deaf impaired and normal Arabian people. This is based on two main steps, including creating a digital output for the hand gestures using gloves flex sensors equipped with a three-axis accelerometer that is controlled using a microcontroller. The digital results are compared to that in a words-based & database& , where Arabs use expressions not alphabet in their communication. The second step is translation or conversion the outputs of the first stage into written texts and voices. The newly developed system allows Arabian deaf to translate words of ordinary people into gestures using a speech recognition system with an impressive accuracy over 90 % without the needing for a webcam, colored gloves, and/or online translator. The presented system can be used on any android or windows.
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 06-2020
Publisher: MDPI AG
Date: 12-07-2022
DOI: 10.3390/NANO12142379
Abstract: The continual rise of the CO2 concentration in the Earth’s atmosphere is the foremost reason for environmental concerns such as global warming, ocean acidification, rising sea levels, and the extinction of various species. The electrochemical CO2 reduction (CO2RR) is a promising green and efficient approach for converting CO2 to high-value-added products such as alcohols, acids, and chemicals. Developing efficient and low-cost electrocatalysts is the main barrier to scaling up CO2RR for large-scale applications. Heteroatom-doped porous carbon-based (HA-PCs) catalysts are deemed as green, efficient, low-cost, and durable electrocatalysts for the CO2RR due to their great physiochemical and catalytic merits (i.e., great surface area, electrical conductivity, rich electrical density, active sites, inferior H2 evolution activity, tailorable structures, and chemical–physical–thermal stability). They are also easily synthesized in a high yield from inexpensive and earth-abundant resources that meet sustainability and large-scale requirements. This review emphasizes the rational synthesis of HA-PCs for the CO2RR rooting from the engineering methods of HA-PCs to the effect of mono, binary, and ternary dopants (i.e., N, S, F, or B) on the CO2RR activity and durability. The effect of CO2 on the environment and human health, in addition to the recent advances in CO2RR fundamental pathways and mechanisms, are also discussed. Finally, the evolving challenges and future perspectives on the development of heteroatom-doped porous carbon-based nanocatalysts for the CO2RR are underlined.
No related grants have been discovered for Kamel Eid.