Affiliation:
1. School of Material Science and Engineering Nanchang Hangkong University 696#, FengHeNan Road Nanchang Jiangxi 330063 China
2. State Grid Jiangxi Electric Power Research Institute Nanchang Jiangxi 330096 China
3. MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
Abstract
Comprehensive SummaryThe kinetic process of a slow oxygen evolution reaction (OER) always constrains the efficiency of overall water electrolysis for H2 production. In particular, nonprecious metal electrodes for the OER have difficulty in possessing excellent electrocatalytic activity and stability in pH‐universal media simultaneously. In this work, urea is first used as a pore‐forming agent and active C/N source to fabricate a nanoporous NiFeCoCN medium‐entropy alloy (MEA) by high‐temperature sintering based on the nanoscale Kirkendall effect. The NiFeCoCN MEA achieves an overpotential of 432 mV at a current density of 10 mA·cm–2 and a lower Tafel slope of 52.4 mV·dec–1 compared to the IrO2/Ti electrode (58.6 mV·dec–1) in a 0.5 mol/L H2SO4 solution. In a 1 mol/L KOH solution, the NiFeCoCN MEA obtains an overpotential of 175 mV for 10 mA·cm–2 and a Tafel slope of 40.8 mV·dec–1, which is better than IrO2/Ni foam. This work proves a novel strategy to design and prepare nanoporous MEA materials with desirable C/N species, which provides promising prospects for the industrial production of H2 energy.
Funder
Aeronautical Science Foundation of China
Fundamental Research Funds for the Central Universities
Key Research and Development Program of Jiangxi Province
National Key Research and Development of China
National Natural Science Foundation of China
Natural Science Foundation of Jiangxi Province
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献