氮掺杂碳负载铁酸钴电催化氧还原性能研究

Electrocatalytic Performances of Nitrogen-doped Carbon Supported Cobalt Ferrite for Oxygen Reduction Reaction

发展高效非贵金属阴极氧还原催化剂,被认为是促进燃料电池商业化应用最具潜力的一条技术途径,其中碳负载金属复合物是对氧还原反应(Oxygen reduction reaction,ORR)能表现出高活性的非贵金属催化剂之一。本文以科琴黑(Ketjenblack EC600JD)、氯化钴、三聚氰胺分别为碳载体、金属前驱体和氮掺杂剂,通过溶剂热法和高温热处理制备了氮掺杂碳负载铁酸钴复合材料(CoFe_(2)O_(4)/NKB-HT)并考察了其在碱性电解质(0.1M KOH)中电催化ORR的性能。结果表明,其起始电势、半波电势和极限电流密度分别达到0.96V、0.79V和4.33mA·cm^(-2),且催化ORR主要以四电子途径进行,适合于用作燃料电池阴极催化剂产生电能。

Development of highly efficient non-noble metal catalysts for cathodic oxygen reduction reaction(ORR)is considered to be the most potential technical approach to promote the commercial application of fuel cells.Among them,carbon supported metal complex is one of the non-noble metal catalysts which can show high activity for ORR.In this paper,nitrogen-doped carbon-supported cobalt ferrite composite(CoFe_(2)O_(4)/N-KB-HT)was prepared by solvothermal method and high-heat treatment using Ketjenblack EC600JD,cobalt chloride and melamine as the carbon support,metal precursor and nitrogen dopant respectively.The results show that electrocatalysis of ORR on the CoFe_(2)O_(4)/N-KB-HT proceeded mainly via a four-electron pathway with the initial potential,half-wave potential and limiting current density reaching 0.96 V,0.79 V and 4.33 mA·cm^(-2),respectively,which is suitable to be used as the cathode catalyst of fuel cell for generating electric energy.