Co/Co-N-C高效氧还原催化剂的制备及其用于镁-空气燃料电池的研究

Preparation of high-efficient oxygen reduction catalyst by one-step pyrolysis of ZIF-67 and study on its application in Mg-air fuel cells

采用还原性气氛一步热解ZIF-67的方法制备钴和氮共掺杂的蓬松絮状碳纳米管Co/Co-N-C催化剂。该催化剂具有高的比表面积和良好的导电性,利用三电极体系在旋转圆盘上进行测试,结果表明,其半波电位为0.82 V,起始电位为0.93 V,表明其氧还原性能表现突出。在镁-空气燃料电池实际应用体系中进行测试,负载该催化剂的单电池最高功率密度可达60 mW/cm^(2),在长达20 h的恒流放电测试中,放电电压没有明显衰减,表明其具有良好的放电稳定性和应用前景。

Co and N co-doped fluffy carbon nanotubes(Co/Co-N-C)catalyst is prepared thorugh one-step pyrolysis of ZIF-67 in a reducing atmosphere.The catalyst has high specific surface area and good conductivity.The half wave potential and initial potential of the catalyst are 0.82 V and 0.93 V,respectively,representing an outstanding performance in catalyzing the reduction of oxygen.When the catalyst is evaluated in the practical application system of Mg-air fuel cell,the highest power density of the single cell loaded with the catalyst can reach 60 mW·cm^(-2).During a constant current discharge test for 20 hours,the discharge voltage has no obvious attenuation,indicating its good discharge stability and application prospect.