摘要
以石墨为原料,采用修正的Hummers法制备氧化石墨(GO),以醋酸钴和硒粉为前驱体以及乙二醇为还原剂,采用一步水热法合成了CoSe_2/rGO复合材料。XRD测试表明,样品由正交结构的CoSe_2晶相组成。在0.5 mol/L H_2SO_4溶液中,CoSe_2/rGO对氧还原反应(ORR)具有高的催化活性和电化学稳定性,电极开路电位(OCP)达到0.79 V(vs. NHE),氧还原主要按照四电子机理直接生成水。CoSe_2/rGO的高催化活性与石墨烯大的比表面积和特殊的电子特性有关,也归因于Se元素对Co电子结构的修饰。
Graphite oxide was prepared by modified Hummers method using graphite as raw material. The CoSe2/rGO composites were synthesized by one step hydrothermal method using cobalt acetate and selenium powder as precursors and ethylene glycol as reductant. X-ray diffraction(XRD) results showed that the sample was composed of CoSe2 crystal phase with orthogonal structure.The catalyst had an open circuit potential(OCP) of 0.79 V(vs. NHE) and showed a promising catalytic activity and electrochemical stability for oxygen reduction reaction(ORR) in 0.5 mol/L H2SO4 solution. The oxygen molecule reduction may proceed via the overall four-electron transfer reaction to form water. The high catalytic activity of CoSe2/rGO was related to the large specific surface area and special electronic properties of graphene, and was also attributed to the modification of Co electronic structure by Se element.
作者
马松艳
田喜强
迟彩霞
赵东江
Ma Song-yan;Tian Xi-qiang;Chi Cai-xia;Zhao Dong-jiang(of Food and Pharmaceutical Engineering,Suihua University,Heilongjiang Suihua 152061,China)
出处
《炭素技术》
CAS
北大核心
2019年第1期14-17,40,共5页
Carbon Techniques
基金
黑龙江省自然科学基金资助项目(B201423)
黑龙江省教育厅基本科研业务费基础研究项目(2016-KYYWF-0923)
国家自然科学基金青年科学基金(21601132)
作者简介
马松艳(1964-),女,教授,硕士,主要从事化学电源研究,E-mail:msyhhh@126.com;通讯作者:赵东江(1965-),男,教授,博士,从事化学电源研究,E-mail:zhaodongjiang1965@163.com。
