Constructing interlaced network structure by grain boundary corrosion methods on CrCoNiFe alloy for high-performance oxygen evolution reaction and urea oxidation reaction  

作　　者：Qiancheng Liu Feng Zhao Xulin Yang Jie Zhu Sudong Yang Lin Chen Peng Zhao Qingyuan Wang Qian Zhang 

机构地区：[1]The Institute for Advanced Study,Chengdu University,Chengdu 610106,China [2]School of Mechanical Engineering,Chengdu University,Chengdu 610106,China [3]Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,Jianghan University,Wuhan 430056,China [4]College of Food and Biological Engineering,Chengdu University,Chengdu 610106,China

出　　处：《Journal of Materials Science & Technology》2024年第36期97-107,共11页材料科学技术(英文版)

基　　金：supported by the National Natu-ral Science Foundation of China(No.52102210);the Natural Sci-ence Foundation of Sichuan Province(Nos.2022NSFSC2005 and 2022NSFSC1255);the Opening Project of Key Laboratory of Op-toelectronic Chemical Materials and Devices of Ministry of Educa-tion,Jianghan University(No.JDGD-202218);Supplementary materials Supplementary material associated with this article can be found,in the online version,at doi:10.1016/j.jmst.2024.01.096.106。

摘　　要：Corrosion engineering is an effective way to improve the oxygen evolution reaction(OER)activity of al-loys.However,the impact of grain boundary corrosion on the structure and electrochemical performance of alloy is still unknown.Herein,the vacuum arc-melted CrCoNiFe alloys with interlaced network struc-tures via grain boundary corrosion methods were fabricated.The grain boundaries that existed as de-fects were severely corroded and an interlaced network structure was formed,promoting the exposure of the active site and the release of gas bubbles.Besides,the(oxy)hydroxides layer(25 nm)on the sur-face could act as the true active center and improve the surface wettability.Benefiting from the unique structure and constructed surface,the CrCoNiFe-12 affords a high urea oxidation reaction(UOR)perfor-mance with the lowest overpotential of 250 mV at 10 mA/cm^(2)in 1 M KOH adding 0.33 M urea.The CrCoNiFe-12||Pt only required a cell voltage of 1.485 V to afford 10 mA/cm^(2)for UOR and long-term sta-bility of 100 h at 10 mA/cm^(2)(27.6 mV decrease).These findings offer a facile strategy for designing bulk multiple-principal-element alloy electrodes for energy conversion.

关 键 词：Grain boundary corrosion Interlaced network structures(oxy)hydroxides layer Urea oxidation reaction 

分 类 号：TG1[金属学及工艺—金属学]