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WS2/WO3 modified carbon anode as efficient electrocatalysts for enhancing electricity generation and pollution
Yugang Sang1,2, Quantong Jiang1,2,3, Fang Guan2,3
1Department of Materials Science and Engineering, Qilu University of Technology, Jinan, China.
Abstract:
Microbial fuel cells (MFCs) have emerged as a new energy technology to solve severe energy and environmental issues. As a bridge connecting the internal and external circuits and a habitat for microorganisms, the anode is a key component influencing the performance output of MFCs. Recently, tungsten trioxide (WO3) and tungsten disulfide (WS2) can be used for the MFC setup. In this study, a direct hydrothermal synthesis method was employed to prepare WS2/WO3 nanomaterials. It was subsequently integrated with carbon paper (CP) to develop WS2/WO3-CP and WO3-CP anodes for MFCs. Contact angle tests showed that the hydrophilicity of the WS2/WO3-CP electrode was significantly improved. In electrochemical tests, the MFCs with WS2/WO3-CP anode exhibited lower charge transfer resistance and higher electron transfer efficiency than the original ones. The MFC with the WS2/WO3-CP anode had a maximum power density reaching 2.32 W·m-2, which was 1.34 and 3.09 times higher than that of the WO3-CP and bare CP anodes, respectively. Meanwhile, this MFC with the WS2/WO3-CP anode showed higher removal rates of chemical oxygen demand and SO4 2- than the WO3-CP and CP anodes. The modified WS2/WO3 nanomaterials are promising materials that can be adopted for MFCs industrial use.
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