The use of abundant elements in the earth as electrocatalytic hydrogen production catalysts is of great significance for hydrogen energy cycling.Herein,we report amorphous TiO2-decorated CoP/NF(TiO2-CoP/NF)as an excellent electrocatalyst for alkaline hydrogen evolution reaction(HER).The well-dispersed amorphous TiO2 on nanoneedle-like CoP arrays preserves the crystal structure of CoP and changes its electronic structure by interfacial charge transfer.Compared to CoP/NF catalyst,the Ti02-CoP/NF composite catalyst exhibits high HER activity with an overpotential of 61 mV at 10 mA cm-2 and high stability.Importantly,it almost maintains the Volmer step as a rate-determining step(RDS)and the Tafel slope at a wide cathodic potential range showing the fast kinetics under large polarization regions.Theoretical simulations reveal that the combination of TiO2 and CoP selectively accelerates the hydrated K+diffusion,regulates the interfacial water orientation to adapt to the subsequent smooth water dissociation,and optimizes *H adsorption/H2 desorption.The strengthened coupling of HER multi-scale-processes on transition metal compound composites catalysts is the underlying mechanism for improving HER activity.

The State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization,College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;Department of Chemical and Biological Engineering,Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,Hong Kong 999077,China

[1]Mingming Deng;Hongmei Yang;Lishan Peng;Ling Zhang;Lianqiao Tan;Guiju He;Minhua Shao;Li Li;Zidong Wei-.Insight into the boosted activity of Ti02-CoP composites for hydrogen evolution reaction:Accelerated mass transfer,optimized interfacial water,and promoted intrinsic activity)[J].能源化学,2022(11):111-120

nanoneedle

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