Metal sulphides combined with graphene/reduced graphene oxide (rGO) represent a unique class of materials for hydrogen generation either through electrocatalytic or photo(electro) catalytic methods. Herein, we report a solvothermal synthesis of Cu₃SnS₄ decorated rGO resulting in a highly active electrocatalyst for hydrogen evolution reaction (HER) compared to its native Cu₃SnS₄. The Cu₃SnS₄‐rGO exhibited very low overpotential of 190 mV versus reversible hydrogen electrode (RHE), whereas Cu₃SnS₄ requires 250 mV versus RHE at a current density of 10 mA/cm². Tafel slope of Cu₃SnS₄‐rGO and Cu₃SnS₄ is about 64 and 76 mV/dec, respectively. This suggests that Cu₃SnS₄‐rGO is a better electrocatalyst when compared to Cu₃SnS₄ and follows mixed Volmer and Heyrovsky mechanism for HER.

中文翻译：

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还原氧化石墨烯上的Cu3SnS4溶剂热修饰，用于增强电催化制氢反应

金属硫化物与石墨烯/氧化石墨烯（rGO）的结合代表了一类独特的用于通过电催化或光（电）催化方法产生氢的材料。在此，我们报告了溶剂热合成Cu ₃ SnS ₄修饰的rGO的结果，与其天然的Cu ₃ SnS ₄相比，产生了用于氢释放反应（HER）的高活性电催化剂。与可逆氢电极（RHE）相比，Cu ₃ SnS ₄ -rGO的超电势仅为190 mV，而在10 mA / cm ²的电流密度下，Cu ₃ SnS ₄相对于RHE则需要250 mV 。Cu ₃ SnS的塔菲尔斜率₄ -rGO和Cu ₃ SnS _4分别约为64和76 mV / dec。这表明铜₃的SnS ₄与Cu相比时-rGO是较好的电催化剂_3周的SnS ₄和如下混合Volmer方程和海洛夫斯基机制HER。