High Alkaline Electrochemical Hydrogen Evolution on a Pt/GaN Heterostructure
CHEMNANOMAT(2023)
摘要
The construction of suitable metal/substrate interfaces that can synergistically optimize the water dissociation, hydrogen transfer and hydrogen adsorption processes has proved to be a promising approach to boost the alkaline electrochemical hydrogen evolution reaction (HER) but remains challenging. Herein, a Pt/GaN heterostructure electrocatalyst is constructed using the electrochemical deposition technique and used for alkaline electrochemical HER. The as-synthesized Pt/GaN catalyst exhibits competitive HER performance, including low overpotentials of 24 and 441 mV to reach current densities of 10 and 1000 mA cm(-2), respectively, and a superior mass activity (7.34 A mg(Pt)(-1) at the overpotential of 100 mV), which is 25.7 and 5.0 times higher than commercial Pt/C and as-synthesized Pt/CP, respectively. First-principle calculations suggest that the Pt/GaN heterostructure can greatly reduce the energy barrier for H2O dissociation, create a local acid-like microenvironment through a H spillover process and optimize the value of & UDelta;G(H), leading to a remarkable acceleration of the alkaline HER kinetics. This discovery provides new insights for the development of alkaline HER catalysts.
更多查看译文
关键词
electrocatalyst, alkaline hydrogen evolution, water dissociation, synergistic effect, metal-support interface
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要