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Your search keyword '"Asif, Mohammad"' showing total 40 results
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40 results on '"Asif, Mohammad"'

10. Design and Experimental Studies on a Single Slope Solar Still for Water Desalination

Author

Al-Mezeini, Saif Salim Saif, primary, Siddiqui, Mohd Asim, additional, Shariq, Mohammad, additional, Althagafi, Talal M., additional, Ahmed, Inas A., additional, Asif, Mohammad, additional, Alsufyani, Sultan J., additional, Algarni, Saud A., additional, Ahamed M.B., Niyaz, additional, Elamin, Khalda M. A., additional, Alaghaz, Abdel-Nasser M. A., additional, and Gomaa, Mohammed M., additional

Published
2023
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39. Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo 2 O 4 for Energy Storage Devices.

Author

Rajasekhara Reddy G, Siva Kumar N, Deva Prasad Raju B, Shanmugam G, Al-Ghurabi EH, and Asif M

Abstract

The demand for eco-friendly renewable energy resources as energy storage and management devices is increased due to their high-power density and fast charge/discharge capacity. Recently, supercapacitors have fascinated due to their fast charge-discharge capability and high-power density along with safety. Herein, the authors present the synthesis of 3D-hierarchical peony-like ZnCo 2 O 4 structures with 2D-nanoflakes by a hydrothermal method using polyvinylpyrrolidone. The reaction time was modified to obtain two samples (ZCO-6h and ZCO-12h) and the rest of the synthesis conditions were the same. The synthesized structures were systematically studied through various techniques: their crystalline characteristics were studied through XRD analysis, their morphologies were inspected through SEM and TEM, and the elemental distribution and oxidation states were studied by X-ray photoelectron spectroscopy (XPS). ZCO-12h sample has a larger surface area (55.40 m 2 ·g -1 ) and pore size (24.69 nm) than ZCO-6h, enabling high-speed transport of ions and electrons. The ZCO-12h electrode showed a high-specific capacitance of 421.05 F·g -1 (31.52 C·g -1 ) at 1 A·g -1 and excellent cycle performance as measured by electrochemical analysis. Moreover, the morphologic characteristics of the prepared hierarchical materials contributed significantly to the improvement of specific capacitance. The excellent capacitive outcomes recommend the 3D-ZnCo 2 O 4 hierarchical peony-like structures composed of 2D-nanoflakes as promising materials for supercapacitors with high-performance.

Published
2020
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40. Silver Quantum Dot Decorated 2D-SnO 2 Nanoflakes for Photocatalytic Degradation of the Water Pollutant Rhodamine B.

Author

Siva Kumar N, Asif M, Ranjeth Kumar Reddy T, Shanmugam G, and Ajbar A

Abstract

Decoration of 2D semiconductor structures with heterogeneous metal quantum dots has attracted considerable attention due to advanced optical, electrical, and catalytic properties that result from the large surface-to-volume ratio associated with these structures. Herein, we report on silver quantum dot decorated 2D SnO 2 nanoflakes for the photocatalytic abatement of water effluents, the synthesis of which was achieved through a straightforward and mild hydrothermal procedure. The photocatalysts were systematically investigated using UV-Vis, XRD, electron microscopy (SEM, HR-TEM), EDX, XPS and FTIR. The photocatalytic activity of the nanostructures was evaluated for the abatement of water pollutant rhodamine B (RhB), under light irradiation. The mild hydrothermal synthesis (100 °C) proved highly efficient for the production of large scale Ag quantum dot (QD)/SnO 2 nanoflakes for a novel photocatalytic application. The decoration of SnO 2 with Ag QDs significantly enhances the synergetic charge transfer, which diminishes the photo-induced electron-hole reunion. Moreover, the plasmonic effect from Ag QDs and 2D-SnO 2 structures acts as an electron tank to collect the photo-induced electrons, generating a Schottky barrier between the SnO 2 structures and quantum dots. Overall, this resulted in a facile and efficient degradation of RhB, with a rate double that of pristine SnO 2 .

Published
2019
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