摘要
用化学腐蚀方法制备出3D多孔自支撑型Mn_(50)Fe_(12.5)Co_(12.5)Ni_(12.5)Cr_(12.5)高熵合金。电化学测试结果表明,将这种高熵合金放入1 mol/L KOH的碱性溶液中,电流密度为10 mA·cm^(-2)时过电位为281 mV,Tafel斜率为63 mV/dec,表明其电催化性能优于商业RuO2的性能。在电流密度为50 mA·cm^(-2)的条件下连续工作50 h,工作电压没有明显的升高,表明这种富锰高熵电催化电极材料具有优异的析氧稳定性。电化学阻抗谱表明,这种自支撑型结构的块体高熵合金催化剂具有出色的导电性,与负载型催化剂相比其电子转移能力显著提高。
A novel three-dimensional porous self-supporting electrode material for electrochemical catalytic oxygen evolution were prepared by chemical etching method from a bulk high-entropy alloy Mn_(50)Fe_(12.5)Co_(12.5)Ni_(12.5)Cr_(12.5).The electrochemical test results show that the overpotential of the prepared electrode material is only 281 mV at the current of 10 mA·cm^(-2) and the Tafel slope is 63 mV/dec in an alkaline solution of 1 mol/L KOH,which is better than that of commercial RuO2.At the same time,the working voltage does not increase significantly after continuous operation for 50 h at the current density of 50 mA·cm^(-2),which reflects the excellent stability during electrocatalytic oxygen evolution process of the Mn-rich high-entropy porous alloy as electrocatalytic electrode material.The Nyquist plots show that the free-standing structure of the bulk HEA catalyst has outstanding electron transfer ability compared with the ordinary supported catalyst.
作者
李海龙
牟娟
王媛媛
葛绍璠
刘春明
张海峰
朱正旺
LI Hailong;MU Juan;WANG Yuanyuan;GE Shaofan;LIU Chunming;ZHANG Haifeng;ZHU Zhengwang(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第5期332-340,共9页
Chinese Journal of Materials Research
基金
国家自然科学基金(52074257)。
关键词
金属材料
电催化剂
高熵合金
析氧反应
多孔结构
metallic materials
electrocatalysts
high-entropy alloy
oxygen evolution
porous structure
