ORCID Profile
0000-0002-2042-763X
Current Organisations
The University of Newcastle
,
University of New South Wales
,
Quaid-i-Azam University
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Publisher: Springer Science and Business Media LLC
Date: 06-02-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC05684J
Abstract: Bimetallic CoFe 2 O 4 clusters supported on graphene act as highly efficient and stable electrocatalysts for ambient electrocatalytic ammonia production.
Publisher: Wiley
Date: 15-09-2020
Publisher: Wiley
Date: 27-08-2023
Publisher: IEEE
Date: 04-2017
Publisher: Elsevier BV
Date: 08-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA11841K
Abstract: Hypostoichiometric Pt/WO 3 shows efficient, selective and stable conversion of aromatic alcohols into corresponding aldehydes under simulated sunlight in aqueous solution.
Publisher: The Electrochemical Society
Date: 2016
DOI: 10.1149/2.0461607JES
Publisher: Elsevier BV
Date: 12-2023
Publisher: American Scientific Publishers
Date: 08-2018
Abstract: Herein, pore size, crystalinity, and Si/Al ratio of mesoporous ZSM-5 (MFI) nanocrystals was controlled by synthesis parameters, such as surfactant concentration ([3-(trimethoxysilyl)propyl] hexa-decyl dimethyl ammonium chloride), sodium hydroxide concentrations, synthesis temperature and time. The morphology, surface structure and composition of the MFI particles was systematically investigated. More notably, the mesopore-dependent catalytic activity of ZSM-5 was evaluated by studying the cracking of n-hexane. The findings suggest the porosity has pronounced impact on the catalytic activity, selectivity and stability of ZSM-5 nanocrystals. Critical surface attributes such as nature of acid sites (Brønsted and Lewis), concentration, and strength are obtained by the infrared study of adsorbed probe molecules (pyridine) and the temperature programmed desorption. In spite of being weaker in Si/Al ratio or acidic strength, mesoporous catalysts showed more stable and efficient cracking of n-hexane suggesting that acidity seems not the predominant factor operative in the activity, selectivity and stability.
Publisher: Wiley
Date: 15-09-2020
Publisher: American Chemical Society (ACS)
Date: 11-08-2015
Abstract: Due to exciting catalytic activity and selectivity, tailoring of nanocatalysts consisting of preferred crystal facets and desired structural properties remains at the forefront of materials engineering. A facile one-step nonhydrolytic solvothermal synthesis of a nanocomposite of reduced graphene oxide and one-dimensional nitrogen-doped Nb2O5 (N-NbOx) with exposed ⟨001⟩ facet is described. Triethylamine performed the dual role as nitrogen source and capping agent to control the size and unidirectional growth of Nb2O5 nanocrystallites. The nanocomposite showed efficient visible-light-mediated (λ > 420 nm) water splitting in a photoelectrochemical cell. A plausible mechanism for the formation of N-NbOx nanorods and improved photoelectrochemical efficacy in terms of their oriented growth is proposed.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 16-09-2016
Publisher: American Chemical Society (ACS)
Date: 10-01-2022
Publisher: Elsevier BV
Date: 03-2013
DOI: 10.1016/J.SAA.2012.12.020
Abstract: A novel class of azo-guanidine compounds is introduced in this article. The novel compound 2-(2-hydroxyphenyl)-1-(phenylamino)-3-(phenylimino)guanidine (AG) was synthesized and well characterized by using different analytical instrumental techniques like elemental analysis, FTIR, (1)H and (13)C NMR, UV-Visible spectroscopy and cyclic voltammetry. The new compound was found interacting with DNA and shows clear color change in the solution. The AG-DNA complex was qualitatively and quantitatively characterized with UV-Visible spectroscopy and cyclic voltammetry. Electrostatic mode of interaction, clear color change and moderate binding constant (K(b)=10(4)) indicate its potential use as DNA staining agent.
Publisher: Elsevier BV
Date: 08-2019
Publisher: Springer Science and Business Media LLC
Date: 10-06-2016
Publisher: Springer Science and Business Media LLC
Date: 24-04-2018
Publisher: Elsevier BV
Date: 2015
Publisher: Wiley
Date: 12-06-2017
Publisher: IOP Publishing
Date: 28-12-2016
Abstract: Incorporation of foreign moiety in the lattice of semiconductors significantly alters their optoelectronic behavior and opens a plethora of new applications. In this paper, we report the synthesis of sulfur-doped zinc oxide (S-doped ZnO) nanorods by reacting ZnO nanorods with diammonium sulfide in vapor phase. Microscopic investigation revealed that the morphological features, such as, the length (2-4 μm) and width (100-250 nm) of the original hexagonal ZnO nanorods remained intact post-sulfidation. X-ray photoelectron spectroscopy analysis of the sulfide s le confirmed the incorporation of sulfur into ZnO lattice. The optical measurements suggested the extension of absorption threshold into visible region upon sulfidation. Photoelectrochemical (PEC) activities of pure and S-doped ZnO nanorods were compared for water oxidation in visible light (λ > 420 nm), which showed several-fold increment in the performance of S-doped ZnO s le the observed amelioration in the PEC activity was rationalized in terms of preferred visible light absorption and low resistance of sulfide s le, as evidenced by optical and electrochemical impedance spectroscopy.
Publisher: Springer Science and Business Media LLC
Date: 24-11-2018
Publisher: American Chemical Society (ACS)
Date: 09-01-2015
DOI: 10.1021/AM507428R
Abstract: Selective conversion of aromatic alcohols into corresponding aldehydes is important from energy and environmental stance. Here, we describe highly selective (>99%) and efficient conversion (>99%) of aromatic alcohols (e.g., 4-methoxybenzyl alcohol and 4-nitrobenzyl alcohol) into their corresponding aldehydes in the presence of Pt-modified nanoporous hierarchical Bi2WO6 spheres in water under simulated sunlight at ambient conditions. Overoxidation of p-anisaldehyde, formed during photooxidation process, was not observed until comprehensive alcohol oxidation was attained. Furthermore, the catalyst showed substantial oxidation under dark and course of conversion was different than that of under light. Dependency of alcohol oxidation on substrate concentration, photocatalyst amount, and Pt loading was studied. The effect of various radical scavengers was investigated, and the rate-determining step was elucidated. It has been envisaged that the reduction site of semiconductor photocatalysts plays more decisive role in determining the selectivity as alcohol preferably get oxidized over that of water. Furthermore, the chemical stability and recyclability of the photocatalyst were investigated.
Publisher: American Chemical Society (ACS)
Date: 12-04-2023
Publisher: American Chemical Society (ACS)
Date: 29-12-2017
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 10-2015
Location: Saudi Arabia
No related grants have been discovered for Muhammad Ibrar Ahmed.