氮掺杂超薄碳纳米片复合铂钌单原子合金催化剂的电化学析氢性能

Nitrogen Doped Ultra-thin Carbon Nanosheet Composited Platinum-ruthenium Single Atom Alloy Catalyst for Promoting Electrochemical Hydrogen Evolution Process

为了减少贵金属的用量,降低成本,提高大规模生产的可能性,构建单原子合金(SAA)是一个非常可行的解决方案.设计了一种超小PtRu单原子合金物种均匀分散在掺氮超薄碳纳米片上的电催化剂(PtRu SAA/NC),并通过基于同步辐射的X射线吸收精细结构(XAFS)光谱进行了结构确认.与纯Ru团簇和氮掺杂的碳片相比,PtRu SAA/NC具有更高的析氢反应(HER)催化活性和特殊的稳定性,在0.5 mol/L H_(2)SO_(4)溶液中进行HER时,表现出较小的Tafel斜率(43 mV/dec),且在10 mA/cm^(2)电流密度下过电位仅为54 mV.

In order to reduce the amount of precious metals,reduce costs and increase the possibility of large-scale production,the construction of single atom alloy(SAA)is a very feasible solution.Herein,an electrocatalyst with ultra-small PtRu single atom alloy species evenly dispersed on nitrogen doped ultra-thin carbon nanosheets(PtRu SAA/NC)was designed,and its structure was confirmed by synchrotron-radiation-based X-ray absorption fine structure(XAFS)spectroscopy.Compared with pure Ru clusters and nitrogen doped carbon sheets,the PtRu SAA/NC possesses higher hydrogen evolution reaction(HER)catalytic activity and exceptional stability,which exhibits a small Tafel slope of 43 mV/dec and a low overpotential of 54 m V at 10 m A/cm^(2) during HER in 0.5 mol/L H_(2)SO_(4)solution.The design of this low-cost and high-efficiency single atom alloy catalyst provides a new research direction for the development of clean energy structure conversion.