MIIT Key Laboratory of Critical Materials Technology, for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P.R. China.
Institute of Advanced Electrochemical Energy, and School of Materials, Science and Engineering, Xi'an University of Technology, Xi'an, 710048, P.R. China.
Chem Asian J. 2018 Oct 18;13(20):3057-3062. doi: 10.1002/asia.201801134. Epub 2018 Sep 19.
The oxygen reduction reaction (ORR) in a cathode is an essential component of many electrochemical energy storage and conversion systems. Two-dimensional materials are beneficial for electron conduction and mass transport with high density, showing prominent electrochemical catalytic performance towards the ORR. Herein, a simple NaCl-assisted method to synthesize cobalt-nitrogen-doped carbon materials (CoNC), which present prominent performance towards the ORR in alkaline media, is described. The utilization of the NaCl template endows the product with a large specific surface area of 556.4 m g , as well as good dispersion of cobalt nanoparticles. CoNC-800@NaCl (800 indicates the calcination temperature in °C) displays an excellent onset potential of 0.94 V (vs. a reversible hydrogen electrode), which is close to that of commercial Pt/C. Additionally, CoNC-800@NaCl also exhibits better long-term durability and methanol tolerance than that of Pt/C. The high-performance CoNC-800@NaCl catalyst provides a hopeful alternative to noble-metal catalysts for the ORR in practical applications.
在阴极中，氧气还原反应（ORR）是许多电化学储能和转换系统的重要组成部分。二维材料有利于电子传导和高密度的质量传输，对 ORR 表现出突出的电化学催化性能。本文描述了一种简单的 NaCl 辅助方法来合成钴-氮掺杂碳材料（CoNC），该材料在碱性介质中对 ORR 表现出突出的性能。NaCl 模板的使用赋予了产物 556.4 m2/g 的大比表面积以及钴纳米粒子的良好分散性。CoNC-800@NaCl（800 表示在°C 下的煅烧温度）显示出 0.94 V（相对于可逆氢电极）的优异起始电位，接近商业 Pt/C 的起始电位。此外，CoNC-800@NaCl 还表现出比 Pt/C 更好的长期耐久性和甲醇耐受性。高性能 CoNC-800@NaCl 催化剂为实际应用中 ORR 的贵金属催化剂提供了一种有希望的替代方案。
