The synthesis and characterization of a Co-N/C composite catalyst for the oxygen reduction reaction in acidic solution  

作　　者：SI YuJun CHEN ChangGuo YIN Wei CAI Hui 

机构地区：[1]College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China [2]College of Chemistry and Pharmaceutical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China,' [3]College of Material Science and Engineering, Chongqing University, Chongqing 400044, China

出　　处：《Chinese Science Bulletin》2011年第11期1086-1091,共6页

基　　金：supported by the Innovative Talent Training Project(CDJXS11220004);the Fundamental Research Funds for the Central Universities of Chongqing University;the Scientific Reserch Fund of SiChuan Provincial Education Department(10ZB126);the Natural Science Foundation Project of Chongqing,China(CSTC2009BB6213)

摘　　要：A non-precious metal Co-N/C catalyst for the oxygen reduction reaction (ORR) was synthesized by heating a mechanical mixture of cobalt chloride,urea and acetylene black under a nitrogen atmosphere.The catalyst was characterized by XRD and XPS.The electrocatalytic activity in the ORR was evaluated by linear sweep voltammetry in 0.5 mol L-1 H2SO4 solution.The results show that the Co-N/C catalyst aids the reduction of oxygen.The presence of elemental cobalt in the precursor allows nitrogen atoms to embed themselves in the graphite matrix to form pyridinic and graphitic type C-N structures as the ORR active sites.The effect of heat-treating temperature on the catalytic activity was also investigated.The results also show that the Co-N/C catalyst is most active when pyrolyzed at 600℃.The obtained Co-N/C catalyst loses some activity after initial exposure to the H2SO4 solution because of leaching,but is then stable for up to 20 h immersion.The catalyst is also stable when charged,which is supported by the cyclic voltammetry results.A non-precious metal Co-N/C catalyst for the oxygen reduction reaction （ORR） was synthesized by heating a mechanical mixture of cobalt chloride, urea and acetylene black under a nitrogen atmosphere. The catalyst was characterized by XRD and XPS. The electrocatalytic activity in the ORR was evaluated by linear sweep voltammetry in 0.5 mol L-1 H2SO4 solution. The results show that the Co-N/C catalyst aids the reduction of oxygen. The presence of elemental cobalt in the precursor allows nitrogen atoms to embed themselves in the graphite matrix to form pyridinic and graphitic type C-N structures as the ORR active sites. The effect of heat-treating temperature on the catalytic activity was also investigated. The results also show that the Co-N/C catalyst is most active when pyrolyzed at 600~C. The obtained Co-N/C catalyst loses some activity after initial exposure to the H2SO4 solution because of leaching, but is then stable for up to 20 h immersion. The catalyst is also stable when charged, which is supported by the cyclic voltammetry results.

关 键 词：复合催化剂 氧还原反应 酸性溶液 合成 线性扫描伏安法 H2SO4溶液 表征 催化剂活性 

分 类 号：O643.36[理学—物理化学]