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

• 来源期刊: 科学通报(英文版)
• 学科: 化学
• 年，卷（期）: 2011,（11）
• 页码范围: 1086-1091
• 页数: 6页
• 分类号: O643.36
• 语种: 中文

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.