电化学2017，Vol.23Issue(4)：400-408,9.DOI:10.13208/j.electrochem.170324
Fe/N/C氧还原催化剂的热稳定性及活性位结构
Thermo-Stability and Active Site Structure of Fe/N/C Electrocatalyst for Oxygen Reduction Reaction
摘要
Abstract
The development of Fe/N/C electrocatalyst for oxygen reduction reaction (ORR) is vital for the large-scale applications of proton exchange membrane fuel cells.Understanding the active site structure will contribute to the rational design of highly active catalysts.In this study,the as-prepared Fe/N/C catalyst based on poly-m-phenylenediamine (PmPDA-FeNx/C) catalyst with the high ORR activity was subjected to the high-temperature heat treatment at 1000 ～ 1500 ℃.The degradation in the ORR activity of PmPDA-FeNx/C with various heat treatments was correlated to the change of elemental compositions,chemical states and textural properties.As the temperature elevated,the Fe atoms aggregated to form nanoparticles,while the gaseous N-containing species volatilized and the amount of N contents decreased,resulting in the destruction of active sites.The XPS analysis revealed that the content of N species with low binding energy show good positive correlation with the ORR kinetic current of catalyst,demonstrating that the pyridinic N and Fe-N species are probably main components of active sites and contribute to the high ORR activity.This study provides a new strategy to investigate the nature of active centre.关键词
Fe/N/C催化剂/氧还原反应/活性位/吡啶型N/Fe-N物种Key words
Fe/N/C electrocatalyst/oxygen reduction reaction/active sites/pyridinic N/Fe-N species分类
化学化工引用本文复制引用
陈驰,赖愉姣,周志有,张新胜,孙世刚..Fe/N/C氧还原催化剂的热稳定性及活性位结构[J].电化学,2017,23(4):400-408,9.基金项目
国家自然科学基金项目(No.21373175,No.21621091)资助 （No.21373175,No.21621091）
