MoSe2-Ni3Se4 Hybrid Nanoelectrocatalysts and Their Enhanced Electrocatalytic Activity for Hydrogen Evolution Reaction
Pengyuan Wu, Gangyong Sun, Yuanzhi Chen, Wanjie Xu, Hongfei Zheng, Jin Xu, Laisen Wang, Dong‐Liang Peng
Abstract
Abstract Combining MoSe 2 with other transition metal dichalcogenides to form a hybrid nanostructure is an effective route to enhance the electrocatalytic activities for hydrogen evolution reaction (HER). In this study, MoSe 2 -Ni 3 Se 4 hybrid nanoelectrocatalysts with a flower-like morphology are synthesized by a seed-induced solution approach. Instead of independently nucleating to form separate nanocrystals, the Ni 3 Se 4 component tends to nucleate and grow on the surfaces of ultrathin nanoflakes of MoSe 2 to form a hybrid nanostructure. MoSe 2 –Ni 3 Se 4 hybrid nanoelectrocatalysts with different Mo:Ni ratios are prepared and their HER catalytic activities are compared. The results show that the HER activities are affected by the Mo:Ni ratios. In comparison with pure MoSe 2 , the MoSe 2 -Ni 3 Se 4 hybrid nanoelectrocatalysts having a Mo:Ni molar ratio of 2:1 exhibit enhanced HER properties with an overpotential of 203 mV at 10 mA/cm 2 and a Tafel slope of 57 mV per decade. Improved conductivity and increased turnover frequencies (TOFs) are also observed for the MoSe 2 -Ni 3 Se 4 hybrid samples.