Co-N-C纳米复合材料氧还原反应性能分析

牛福，栾惟然

山东交通学院汽车工程学院，山东 济南  250357

摘要：为研究质子交换膜燃料电池阴极催化剂氧还原反应（oxygen reduction reaction，ORR）性能，采用模板法、水热法和高温热解还原制备Co-N-C纳米复合材料；采用循环伏安法和线性扫描伏安法，结合三电极测试体系分析不同硝酸钴质量、煅烧温度下催化剂样品的ORR性能，并将Pt-C催化剂作为标准催化剂进行对比。试验结果表明：Co-N-C催化剂最佳煅烧温度为900 ℃；硝酸钴质量为50 mg、煅烧温度为900 ℃时的催化剂Co-N-C-50-900的半波电位及扩散控制区极限电流密度更接近标准催化剂，ORR性能较好；催化过程以4电子反应为主，该催化剂制备方法简单便捷，成本较低，且符合催化剂ORR要求。

关键词：燃料电池；催化剂；氧还原反应；煅烧温度；半波电位

Analysis of the oxygen reduction reaction performance of Co-N-C nanocomposite materials

NIU Fu, LUAN Weiran

School of Automotive Engineering, Shandong Jiaotong University, Jinan 250357, China

Abstract: In order to study the oxygen reduction reaction (ORR) performance of the cathode catalyst of proton exchange membrane fuel cells, Co-N-C nanocomposites are prepared by template method, hydrothermal method and high temperature pyrolysis reduction. The ORR performance of the catalyst samples at different cobalt nitrate mass and calcination temperatures is studied by cyclic voltammetry and linear scanning voltammetry with a three-electrode testing system, and the Pt-C catalyst is used as the standard catalyst for comparison. The experimental results show that the optimal calcination temperature of Co-N-C catalyst is 900 ℃; the half-wave potential and the limiting current density of the diffusion-controlled region of the Co-N-C-50-900 with a cobalt nitrate mass of 50 mg and calcination temperature of 900 ℃ are to those of the standard catalyst, and the ORR performance is better; the catalytic process is dominated by 4-electron reaction, and the preparation method of catalyst is simple and convenient, with the low cost and meets the requirements of ORR for catalysts.

Keywords: fuel cell; catalyst; oxygen reduction reaction; calcination temperature; half-wave potential