【作者】 张波； 肖春辉； 向阳； 董碧桃； 丁书江； 唐玉海；

【Author】 Bo Zhang;Chuihui Xiao;Yang Xiang;Bitao Dong;Shujiang Ding;Yuhai Tang;Department of Applied Chemistry, School of Science, Xi’an Jiaotong University;

【机构】 西安交通大学；

【摘要】 开发在金属-空气电池和燃料电池阴极氧还原反应中高效耐用的催化剂是必需的。在本文中,大小为2.5-8.5nm的氮掺杂石墨烯量子点在热还原氧化石墨烯原位生长均匀,这不同于那些加入预先制备好的石墨烯量子点催化剂。通过对各种材料的表征技术的结果表明,包覆在氧化石墨烯表面的聚多巴胺膜,通过吸附大量的铁离子,可以在高温下变换成高度石墨化的氮掺杂石墨烯量子点。我们的催化剂在相同负载量下表现出类似铂碳的催化活性、较好的耐久性以及较高的耐甲醇渗透性。更多还原

【Abstract】 Highly active and durable catalysts are essential to promote the oxygen reduction reaction(ORR) at the cathode in metal-air batteries and fuel cells. In this paper, N-doped graphene quantum dots(GQDs) with a size of 2.5-8.5 nm are ultra-uniformly grown on the thermally reduced graphene oxide in situ, different from those catalysts by adding pre-prepared GQDs artificially. Based on the results of various characterization techniques of the material, we present that, the polydopamine membrane coated on the surface of graphene oxide, where adsorbs a large amount of iron ions, could transform to highly graphitized GQDs along with the incorporation of N element under an annealing process. As a result, our catalyst shows comparable ORR catalytic activity to the state of art Pt/C catalyst with the same mass and better durability and higher tolerance to the methanol crossover effect.更多还原