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Polythionine Coated on Au/Co3O4 Enhances the Performance for Hydrogen Evolution Reaction

    https://doi.org/10.1142/S1793292021500557Cited by:1 (Source: Crossref)

    Developing a general, green and effective strategy to improve the hydrogen evolution reaction (HER) electrocatalyst is urgently needed but challenging. Herein, we report a novel conducting polymer/metal/metal oxide composite as HER catalyst prepared by a two-step strategy, in which the Au/Co3O4 is synthesized by a one-pot hydrothermal method, subsequently, cyclic voltammetry is employed to electropolymerize polythionine on the Au/Co3O4. It is demonstrated that the HER electrocatalytic activity of Au/Co3O4 is effectively improved by the coating polythionine layer. The optimal polythionine/Au/Co3O4 displays an excellent electrocatalytic ability towards HER with an overpotential of 168mV at 10mAcm210mAcm2 and low Tafel slope of 79mVdec11 in 0.5M H2SO4, which is greatly superior to those of the Au/Co3O4 (an overpotential of 300mV at 10mAcm210mAcm2 and tafel slope of 157mVdec1)157mVdec1). Interestingly, the HER performance of N-doped reduced graphene (N-rGO) can also be significantly boosted by the coating polythionine layers, indicating the multifunctionality of polythionine in the enhancement of HER performance of nano electrocatalysts.