462862 1T-WS2 on Graphite Foam As a Binder-Free Electrode for Enhanced Hydrogen Evolution

Tuesday, November 15, 2016: 3:15 PM
Golden Gate 8 (Hilton San Francisco Union Square)
Xiaomeng Guo1, Yuanzhi Zhu1, Junyi Ji2, Xiaobin Fan1, Guoliang Zhang1, Fengbao Zhang1 and Wenchao Peng1, (1)School of Chemical Engineering & Technology, Tianjin University, Tianjin, China, (2)College of Chemical Engineering, Sichuan University, Chengdu, China

1T-WS2 on Graphite Foam as a binder-free electrode for Enhanced Hydrogen Evolution

1Xiaomeng Guo, 1Yuanzhi Zhu, 2Junyi Ji*, 1Xiaobin Fan, 1Guoliang Zhang, 1Fengbao Zhang, 1Wenchao Peng*

1School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China,

wenchao.peng@tju.edu.cn

2College of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, China,

 junyiji@scu.edu.cn

Hydrogen is regarded as a clean alternative energy carrier due to its high energy density and environmental friendliness. Electrochemical catalytic hydrogen evolution reaction (HER) is an efficient method for the production of hydrogen. Pt-group metals are the most effective HER catalysts due to their low overpotential and high efficiency. However, these metals are rare and expensive to apply on an industrial scale. To develop highly active and low-cost HER catalysts remains a big challenge. Molybdenum disulfide (MoS2) and tungsten disulphide (WS2) are emerging HER catalysts that could be used as a substitute for noble metals in HER.

   In this study, a three dimensional graphite foam (GF) was synthesized on the Ni foam using chemical vapor deposition (CVD) method. After the removal of Ni foam with HCl aqueous solution, exfoliated 1T-WS2 was dipped on the surface of GF to obtain the GF-WS2 composite. Due to the 3D structure and strong mechanical strength of GF, the composite can be used as a binder-free electrode. The GF-WS2 electrode was then tested for the HER performance in 0.5 M H2SO4 solution, and excellent HER activity was observed with a small overpotential of ∼0.1 V (vs RHE). Compared to the naked WS2, the overpotential had been decreased ~0.1 V, and the cathodic current can increase ~10 times at a bias of -0.3V. This activity improvement should be due to the strong chemical and electronic coupling between the GF supports and WS2 nanosheets. The electrical coupling could afford rapid electron transport from the less-conducting WS2 nanosheets to the GF with more active sites. The GF-WS2 is therefore a promising binder-free electrode with great potentials for hydrogen production.


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