应用于锌-空气电池的新型碳载钴-聚噻吩复合催化剂

采用化学氧化聚合法合成了以碳为载体的钴-聚噻吩复合物(Co-PTh/C)作为气体扩散电极氧还原催化剂。 通过扫描电子显微镜-能量色散X射线能谱（SEM-EDX）、透射电子显微镜（TEM）等测试技术对催化剂进行表征。 结果表明，Co-PTh/C催化剂颗粒的粒径为10~30 nm，且分布均匀。 利用极化曲线、交流阻抗等电化学方法测试了其在碱性介质中(6 mol/L KOH)对氧还原的催化性能。 此催化剂在碱性介质中空气气氛条件下，电极电位在-0.20 V(vs.Hg/HgO)时电流密度达到0.152 A/cm2，催化性能高于质量分数5%Pt/C，显示出优越的氧还原电催化性能。 采取催化层/集流体/扩散层的排布方式，以纯锌为负极，6 mol/L的KOH为电解液，将气体扩散电极与锌负极组装成锌-空气电池。 电池以0.075 A/cm2进行恒流放电，放电电压为1.1 V且性能稳定。

Application of Novel Carbon-supported Cobalt Polythiophene Composite Catalysts in Zinc-air Cell

Cobalt/polythiophene/carbon black composite catalysts(Co-PTh/C) were firstly synthesized by an oxidative chemical polymerization and then were tested as a reduction reagent in the gas diffusion electrode of zinc-air cells. The as prepared catalysts were characterized by means of SEM-EDX and TEM techniques, which showed that they dispersed uniformly and had a size range of 10 to 30 nm. The catalytic activity of the products towards ORR(oxygen reduction reaction) in a 6 mol/L KOH aqueous solution was evaluated by cathodic polarization curves(LSV) and electrochemical impedance spectroscopy(EIS). A current density of 0.152 A/cm2 at -0.20 V(vs.Hg/HgO) could be achieved on the electrode with Co PTh/C as catalyst, which is superior to 5%Pt/C. Using this electrode as a positive electrode and pure zinc as a negative electrode, a zinc-air cell could be assembled. The cell showed a stable voltage platform of 1.1 V with a constant current density of 0.075 A/cm2 when discharged in a 6.0 mol/L KOH solution.