Reduced Graphene Oxide Supported Zinc Tungstate Nanoparticles as Proficient Electro-Catalysts for Hydrogen Evolution Reactions

Catalysts

Saad M. Alshehri¹  Jahangeer Ahmed¹  Tansir Ahamad¹  Norah Alhokbany¹ 

[1] Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;

关键词: nanocomposites;    hydrogen evolution;    energy storage and conversion;   

DOI  :  10.3390/catal12050530

来源: DOAJ

【 摘 要 】

The nanocomposites of reduced graphene oxide (rGO) supported zinc tungstate nanoparticles (ZnWO₄-NPs) receive considerable attention in electro-catalytic hydrogen evolution reactions (HER) and reveal significantly higher electro-catalytic performances than pure ZnWO₄-NPs in alkaline media (i.e., 0.5 M KOH electrolyte). The polarization studies show that the ZnWO₄-NPs@rGO nanocomposites exhibit low energy loss and good electrode stability during electrochemical reactions for HER. Furthermore, the Tafel slope of ZnWO₄-NPs@rGO nanocomposites is found to be approximately 149 mV/dec, which closely agrees with the reported Tafel values of the noble metal electrocatalyst. In contrast, the performance of the ZnWO₄-NPs@rGO nanocomposite is found to be approximately 1.5 times higher than that of ZnWO₄-NPs in hydrogen production efficiency. Our results emphasize the significance of the nanocomposites with enhanced electro-catalytic activities by lowering the energy loss during electro-catalysis in an alkaline medium.

【 授权许可】

Unknown