Catalyzing WO3/W nanostructures by 2D transition metal dichalcogenides for enhanced water splitting
Paper ID : 1255-ICNS
Authors:
Majdoddin Mojaddami *1, Abdolreza Simchi2
1Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran.
2Department of Materials Science and Engineering, Sharif University of Technology, Tehran, 14588, Iran
Abstract:
Photoelectrochemical water splitting is known as a clean method for hydrogen production as a clean energy source. Among proposed photoanodes, WO3 is considered as a photo-stable environmentally compatible semiconductor. High active surface area and fast kinetic of oxygen evolution reaction is crucial to improve the efficiency of WO3 photoanodes. To have a high active surface area electrode for water splitting, we present a scalable method to produce a porous tungsten network by means of copper etching from commercial W-Cu powder metallurgy (P/M) parts followed by hydrothermal processing to grow WO3 nanoflakes. To improve the performance of the electrode, ultrasonically exfoliated WS2 and MoS2 nanosheets were mixed and deposited on WO3 nanoflakes. The coated photoelectrode demonstrated 9.75 mA.cm-2 current density at 1 VAg/AgCl which is 210% higher than that of WO3/W electrode (4.64 mA.cm-2). The coated sample exhibited lower resistance and higher charge transfer rate in electrochemical impedance spectroscopy and Mott-Schottky studies.
Keywords:
Oxygen evolution reaction; Hydrogen; Renewable energy; Photoelectrochemical water splitting.
Status : Abstract Accepted (Poster Presentation)