ORCID Profile
0000-0002-5063-8390
Current Organisation
Southeast University
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Functional Materials | Materials Engineering | Metals and Alloy Materials
Hydrogen Production from Renewable Energy | Fabricated Metal Products not elsewhere classified |
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 03-2016
Publisher: Springer Science and Business Media LLC
Date: 06-12-2016
DOI: 10.1038/SREP38520
Abstract: Stability and reusability are important characteristics of advanced catalysts for wastewater treatment. In this work, for the first time, sulfate radicals (SO 4 ∙ − ) with a high oxidative potential (E o = 2.5–3.1 V) were successfully activated from persulfate by a Fe 78 Si 9 B 13 metallic glass. This alloy exhibited a superior surface stability and reusability while activating persulfate as indicated by it being used for 30 times while maintaining an acceptable methylene blue (MB) degradation rate. The produced SiO 2 layer on the ribbon surface expanded strongly from the fresh use to the 20 th use, providing stable protection of the buried Fe. MB degradation and kinetic study revealed 100% of the dye degradation with a kinetic rate k = 0.640 within 20 min under rational parameter control. The dominant reactive species for dye molecule decomposition in the first 10 min of the reaction was hydroxyl radicals (∙OH, E o = 2.7 V) and in the last 10 min was sulfate radicals (SO 4 ∙ − ), respectively. Empirical operating variables for dye degradation in this work were under catalyst dosage 0.5 g/L, light irradiation 7.7 μW/cm 2 , and persulfate concentration 1.0 mmol/L. The amorphous Fe 78 Si 9 B 13 alloy in this work will open a new gate for wastewater remediation.
Publisher: Elsevier BV
Date: 02-2018
Publisher: MDPI AG
Date: 2020
Abstract: Fe-based metallic glasses have been demonstrated as effective heterogeneous catalysts in Fenton-like processes for dye degradation. Yet, currently corresponding studies have limitations due to the limited study object (dyes) and the correlation between metallic glasses and dye pollutants in Fenton-like processes is still not comprehensively studied. Accordingly, this work intensively investigated the thermal catalytic behavior correlations between two Fe-based metallic glasses (Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3) and eight different dyes. Results indicated a lower activation energy in the more active metallic glass and a dependence of the activation energy of Fe-based metallic glasses in dye solutions. In addition, a high H2O2 concentration led to a declined catalytic efficiency but a photo-enhanced Fenton-like process overcame this limitation at high concentration of H2O2 due to the decrease of pH and enhancement of irradiation. Furthermore, the average mineralization rates of Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 have been measured to be 42.7% and 12.6%, respectively, and the correlation between decolorization and mineralization revealed that a faster decolorization in a Fenton-like process contributed to a higher mineralization rate. This work provides an intrinsic viewpoint of the correlation between Fe-based metallic glasses and dyes in Fenton-like processes and holds the promise to further promote the industrial value of metallic glasses.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier
Date: 2022
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 05-2017
Publisher: American Chemical Society (ACS)
Date: 28-06-2022
Publisher: Springer Science and Business Media LLC
Date: 04-03-2022
Publisher: American Chemical Society (ACS)
Date: 10-09-2020
Publisher: Wiley
Date: 25-07-2023
Abstract: Platinum‐based electrocatalysts possess high water electrolysis activity and are essential components for hydrogen evolution reaction (HER). A major challenge, however, is how to break the cost‐efficiency trade‐off. Here, a novel defect engineering strategy is presented to construct a nanoporous (FeCoNiB 0.75 ) 97 Pt 3 (atomic %) high‐entropy metallic glass (HEMG) with a nanocrystalline surface structure that contains large amounts of lattice distortion and stacking faults to achieve excellent electrocatalytic performance using only 3 at% of Pt. The defect‐rich HEMG achieves ultralow overpotentials at ere‐level current density of 1000 mA cm −2 for HER (104 mV) and oxygen evolution reaction (301 mV) under alkaline conditions, while retains a long‐term durability exceeding 200 h at 100 mA cm −2 . Moreover, it only requires 81 and 122 mV to drive the current densities of 1000 and 100 mA cm −2 for HER under acidic and neutral conditions, respectively. Modelling results reveal that lattice distortion and stacking fault defects help to optimize atomic configuration and modulate electronic interaction, while the surface nanoporous architecture provides abundant active sites, thus synergistically contributing to the reduced energy barrier for water electrolysis. This defect engineering approach combined with a HEMG design strategy is expected to be widely applicable for development of high‐performance alloy catalysts.
Publisher: Wiley
Date: 30-05-2021
Abstract: Developing highly efficient and durable electrocatalysts for hydrogen evolution reaction (HER) under both alkaline and acidic media is crucial for the future development of a hydrogen economy. However, state‐of‐the‐art high‐performance electrocatalysts recently developed are based on carbon carriers mediated by binding noble elements and their complicated processing methods are a major impediment to commercialization. Here, inspired by the high‐entropy alloy concept with its inherent multinary nature and using a glassy alloy design with its chemical homogeneity and tunability, we present a scalable strategy to alloy five equiatomic elements, PdPtCuNiP, into a high‐entropy metallic glass (HEMG) for HER in both alkaline and acidic conditions. Surface dealloying of the HEMG creates a nanosponge‐like architecture with nanopores and embedded nanocrystals that provides abundant active sites to achieve outstanding HER activity. The obtained overpotentials at a current density of 10 mA cm −2 are 32 and 62 mV in 1.0 m KOH and 0.5 m H 2 SO 4 solutions, respectively, outperforming most currently available electrocatalysts. Density functional theory reveals that a lattice distortion and the chemical complexity of the nanocrystals lead to a strong synergistic effect on the electronic structure that further stabilizes hydrogen proton adsorption/desorption. This HEMG strategy establishes a new paradigm for designing compositionally complex alloys for electrochemical reactions.
Publisher: Wiley
Date: 02-08-2017
Publisher: Springer Science and Business Media LLC
Date: 21-10-2022
DOI: 10.1038/S41467-022-33725-8
Abstract: Hydrogen energy is critical for achieving carbon neutrality. Heterostructured materials with single metal-atom dispersion are desirable for hydrogen production. However, it remains a great challenge to achieve large-scale fabrication of single atom-anchored heterostructured catalysts with high stability, low cost, and convenience. Here, we report single iron (Fe) atom-dispersed heterostructured Mo-based nanosheets developed from a mineral hydrogel. These rationally designed nanosheets exhibit excellent hydrogen evolution reaction (HER) activity and reliability in alkaline condition, manifesting an overpotential of 38.5 mV at 10 mA cm −2 , and superior stability without performance deterioration over 600 h at current density up to 200 mA cm −2 , superior to most previously reported non-noble-metal electrocatalysts. The experimental and density functional theory results reveal that the O-coordinated single Fe atom-dispersed heterostructures greatly facilitated H 2 O adsorption and enabled effective adsorbed hydrogen (H*) adsorption/desorption. The green, scalable production of single-atom-dispersed heterostructured HER electrocatalysts reported here is of great significance in promoting their large-scale implementation.
Publisher: Springer Science and Business Media LLC
Date: 29-03-2022
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 08-02-2019
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 06-2023
Publisher: Wiley
Date: 13-09-2018
Abstract: Metallic glasses (MGs) with the metastable nature and random atomic packing structure have attracted large attention in the catalytic family due to their superior catalytic performance. In contrast, their crystalline counterparts are restricted by the highly ordered packing structure, fewer surface active sites, and crystallographic defects for catalytic activity. The uncertainty of the different catalytic mechanisms and the intrinsic characteristics correlated to MGs and their crystalline counterparts become a major impediment to promote their catalytic efficiencies and widespread applications. Herein, it is reported that the excellent catalytic behavior in Fe-based MGs goes through a detrimental effect with the partial crystallization, but receives a compelling rejuvenation in the full crystallization. Further investigation reveals that multiphase intermetallics with electric potential differences in fully crystallized alloys facilitate the formation of galvanic cells. More importantly, extensively reduced grain boundaries due to grain growth greatly weaken electron trapping and promote inner electron transportation. The relatively homogenous grain-boundary corrosion in the intermetallics contributes to well-separated phases after reaction, leading to refreshment of the surface active sites, thereby quickly activating hydrogen peroxide and rapidly degrading organic pollutants. The exploration of catalytic mechanisms in the crystalline counterparts of MGs provides significant insights into revolutionize novel catalysts.
Publisher: Elsevier BV
Date: 07-2014
Publisher: Wiley
Date: 10-10-2022
Abstract: The rational design of high‐performance and cost‐effective electrocatalysts to overcome the kinetically sluggish water oxidation reaction is a grand challenge in water electrolysis. Transitional metals with incompletely filled d orbitals are expected to have intrinsic electronic interaction to promote the reaction kinetics, however, the construction of multiple active sites is still a bottleneck problem. Here, inspired by an amorphous alloy design strategy with chemical tunability, a noble‐metal‐free FeCoMoPB amorphous nanoplate for superior alkaline water oxidation is developed. The achieved overpotentials at current densities of 10, 100, and 500 mA cm −2 are 239, 281, and 331 mV, respectively, while retaining a reliable stability of 48 h, outperforming most currently available electrocatalysts. Experimental and theoretical results reveal that the chemical complexity of the amorphous nanoplate leads to the formation of multiple active sites that is able to greatly lower the free energy of the rate‐determining step during the water oxidation reaction. Moreover, the Mo element would result in an electron delocalization behavior to promote electron redistribution at its surrounding regions for readily donating and taking electrons. This amorphous alloy design strategy is expected to stimulate the development of more efficient electrocatalysts that is applicable in energy devices, such as metal–air batteries, fuel cells, and water electrolysis.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 12-2017
Publisher: MDPI AG
Date: 17-07-2017
DOI: 10.3390/MET7070273
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 08-04-2020
Publisher: Elsevier BV
Date: 05-2020
Publisher: Informa UK Limited
Date: 16-02-2022
Publisher: Springer Science and Business Media LLC
Date: 21-05-2019
DOI: 10.1038/S41598-019-42973-6
Abstract: Exploring an efficient and photostable heterostructured photocatalyst is a pivotal scientific topic for worldwide energy and environmental concerns. Herein, we reported that Pt decorated g-C 3 N 4 /Bi 2 MoO 6 heterostructured composites with enhanced photocatalytic performance under visible light were simply synthesized by one-step hydrothermal method for methylene blue (MB) dye degradation. Results revealed that the synthetic Pt decorated g-C 3 N 4 /Bi 2 MoO 6 composites with Bi 2 MoO 6 contents of 20 wt.% (Pt@CN/20%BMO) presented the highest photocatalytic activity, exhibiting 7 and 18 times higher reactivity than the pure g-C 3 N 4 and Bi 2 MoO 6 , respectively. Structural analyses showed that Bi 2 MoO 6 microplates were anchored on the wrinkled flower-like g-C 3 N 4 matrix with Pt decoration, leading to a large expansion of specific surface area from 10.79 m 2 /g for pure Bi 2 MoO 6 to 46.09 m 2 /g for Pt@CN/20%BMO. In addition, the Pt@CN/20%BMO composites exhibited an improved absorption ability in the visible light region, presenting a promoted photocatalytic MB degradation. Quenching experiments were also conducted to provide solid evidences for the production of hydroxyl radicals ( • OH), electrons (e − ), holes (h + ) and superoxide radicals ( • O 2− ) during dye degradation. The findings in this critical work provide insights into the synthesis of heterostructured photocatalysts with the optimization of band gaps, light response and photocatalytic performance in wastewater remediation.
Publisher: American Chemical Society (ACS)
Date: 17-02-2022
Publisher: Elsevier BV
Date: 04-2017
Start Date: 12-2022
End Date: 12-2022
Amount: $433,000.00
Funder: Australian Research Council
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