氮碳共掺杂CoFe2O4氧还原催化剂制备及研究  

Preparation and study of CoFe2O4 catalyst co-doped with nitrogen and carbon for oxygen reduction reaction

作　　者：李颖 荣婉琪 LI Ying;RONG Wan-qi(Institute for Advanced Study,Shenzhen University,Shenzhen 518000,Guangdong Province,China;Quality Control Department,Tianjin Jialin Pharmaceutical Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]深圳大学高等研究院,广东深圳518000 [2]天津嘉林科医有限公司质量控制部,天津300000

出　　处：《化学工程》2020年第10期29-33,共5页Chemical Engineering(China)

摘　　要：传统的碱性聚合物电解质膜燃料电池催化剂为铂、铑等贵金属,但是其价格昂贵,限制了其广泛应用。为了解决这一问题,文中通过微波法合成超细CoFe2O4粉体,在高温下使其与聚苯胺进行原位复合,在不同焙烧温度下制备出不同CoFe2O4质量分数的氮碳共掺杂CoFe2O4氧还原催化剂。该催化剂化学活性高,可用作碱性聚合物电解质膜燃料电池的阴极非贵金属催化剂。LSV电化学测试表明,焙烧温度和CoFe2O4质量分数均影响氮碳共掺杂CoFe2O4催化剂的催化活性,且当焙烧温度为1000℃,CoFe2O4质量分数为5%时,该催化剂具有最优的催化活性,起始氧还原电位为0.88 V;Raman、XPS表明,该催化剂中含有较多的表面缺陷碳原子和石墨型的氮,这是其氧还原催化活性高的一个重要因素。Traditional alkaline polymer electrolyte membrane fuel cell catalysts usually use noble metals such as platinum and rhodium.However,the application is limited due to the high price of the catalyst.In order to solve this problem,the ultrafine CoFe2O4 powder was synthesized with microwave method and the CoFe2O4 was in situ composite with polyaniline at a high temperature.The CoFe2O4 catalysts co-doped with nitrogen and carbon were prepared with different contents of CoFe2O4 at different calcination temperatures.The catalysts had a high chemical activity and can be used as a cathode non-noble metal catalyst for alkaline polymer electrolyte membrane fuel cell.LSV indicated that both the calcination temperature and the content of CoFe2O4 affected the chemical activity.The catalyst with 5% CoFe2O4 prepared at 1000℃ had the optimal catalytic activity,and the initial oxygen reduction potential was 0.88 V.Raman and XPS indicated that the optimal catalyst contained more surface-deficient carbon atoms and graphite nitrogen than the rest catalysts,which was an significant factor that led to the best catalytic activity.

关 键 词：非贵金属催化剂 氮碳共掺杂CoFe2O4 氧还原 表面缺陷碳 石墨型 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]