化石燃料的大量使用造成了严重的温室效应，寻求高效清洁的能源转换动力系统迫在眉睫。燃料电池因其环境无污染和能量转换效率高等优点，被看作是解决这一问题的有效方法之一。但燃料电池阴极上的氧还原反应动力学缓慢，限制了燃料电池的实际能量转换效率。因此，需要应用高效的氧还原反应(ORR)催化剂，以提高电池的整体性能。目前商用Pt/C催化剂价格高昂，产量稀缺，且稳定性差，限制了燃料电池的广泛应用。层状双金属氢氧化物（LDH）因其特殊的层状结构特征、层板结构可调等特点而备受关注。本论文以LDH为研究主体，以尿素为沉淀剂，氟化铵为晶型调控剂，通过水热合成法将其与多壁碳纳米管进行复合，成功制备出一系列碳纳米管负载的CoFe-LDHs催化剂(CoFe-LDHs@CNT)，并探究了反应物比例、反应温度等条件对材料结构和催化性能的影响。结果显示，钴铁摩尔比为3:1、反应温度为140 ℃下所合成的Co₃Fe₁-LDH@CNT性能最优，在0.1M KOH电解液中，其ORR的半波电位为0.73 V，略低于商用Pt/C催化剂，但具有明显的价格优势。

The use of fossil fuels has caused serious greenhouse effect, so it is urgent to seek efficient and clean energy conversion power system. Fuel cell is regarded as one of the effective device to solve the problem because of pollution-free environment and high energy conversion efficiency. However, the slow kinetics of oxygen reduction reaction at the cathode of fuel cell limits the actual energy conversion efficiency of fuel cell. Therefore, it is necessary to design efficient ORR catalyst to improve the property of fuel cell. At present, the disadvantages of high price, scarce yield and poor stability of commercial Pt/C catalysts limit the wide application of fuel cells. Layered double hydroxide (LDH) have attracted much attention because of their special layered structure and adjustable lamellar characteristic. In this paper, a series of catalysts which combining CoFe-LDHs with carbon nanotubes(CoFe-LDH@CNT)were successfully prepared. And the CoFe-LDH@CNT was synthesized with urea as precipitant and ammonium fluoride as crystal regulator. The effects of reactant ratio, reaction temperature and other conditions on the structure and catalytic performance of materials were investigated. The results show that in 0.1M KOH electrolyte, the Co/Fe mole ratio is 3:1. Under the reaction temperature of 140 ℃, Co₃Fe₁-LDH@CNT has the best performance. In 0.1M KOH electrolyte, the half-wave potential of its ORR is 0.73 V, which is slightly lower than that of commercial Pt/C catalyst, but Co₃Fe₁-LDH@CNT has a better price advantage.