热处理温度对锂氧气电池用Co-N/C催化剂催化性能的影响(英文)

Influence of Calcination Temperature on Performances of Co-N/C Electrocatalysts for Li/O_2 Cells

开发低成本、高效的空气电极催化剂是发展锂空气电池的关键课题之一.采用邻菲咯啉(phen)为配体制备Co(phen)2配合物,负载于BP2000碳载体上,并分别在600、700、800和900°C的温度下进行热处理,制备得到碳支撑的Co-N催化剂(Co-N/C).对催化剂的氧还原反应/析氧反应(ORR/OER)活性进行了表征,并且与典型的CoTMPP/C催化剂进行了比较.同时研究了煅烧温度对Co-N/C催化剂的组成和结构的影响.电化学测试结果表明,热处理温度为700-800°C时催化剂具有较好的电化学性能.Co-N/C催化剂具有电化学性能优良与低成本的特点,是一种良好的锂氧气电池催化剂.

The development of low-cost and effective electrocatalysts for air electrodes is critical for practical applications of lithium/oxygen batteries. In the present work, phenanthroline （phen） was used as a ligand to prepare a Co（phen）2 complex. The Co（phen）2 complex was coated on BP2000 and then heat treated at 600, 700, 800, and 900 ℃, to obtain carbon-supported Co-N （Co-N/C） catalysts. The catalytic activities in oxygen reduction reaction/oxygen evolution reaction （ORR/OER） of the prepared catalysts were measured and compared with those of a typical carbon-supported cobalt tetramethoxyphenylporphyrin （CoTMPP/C） catalyst. The influence of the calcination temperature on the composition and structure of the Co-N/C catalysts was investigated. Electrochemical tests showed that the Co-N/C catalysts prepared at 700 and 800 ℃ gave better performances, comparable to that of the CoTMPP/C catalyst. The superior electrochemical performance of the prepared Co-N/C catalysts and the low cost of the phenanthroline chelating agent make Co-N/C a promising cheap catalyst for lithium/oxygen batteries.