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采用真空离子镀和乙醇催化燃烧方法对燃料电池石墨电极进行纳米Pt和炭黑复合表面改性,用扫描电镜(SEM)、透射电镜(TEM)、电化学工作站等手段研究电极表面改性前后的组织形貌和电催化性能,并探讨了纳米Pt和炭黑对电极电催化性能的影响。研究表明,石墨电极经过纳米Pt/炭黑复合表面改性后,其循环伏安曲线上出现了三个氧化峰并具有更大的背景电流。与纳米Pt单一表面改性相比,纳米Pt/炭黑复合表面改性后的电极对乙醇的电催化性更好。纳米炭黑表面改性获得的高比表面积以及催化材料Pt的协同作用有效提高了电极对乙醇的电催化性能。
The graphite electrode of fuel cell was modified by nano-Pt and carbon black by vacuum ion plating and ethanol catalytic combustion. The surface modification of electrode was studied by means of SEM, TEM and electrochemical workstation Morphology and electrocatalytic performance of the electrode were investigated. The effects of nano-Pt and carbon black on the electrocatalytic performance of the electrode were also discussed. The results show that the graphite electrode has three oxidation peaks on the cyclic voltammetry and a larger background current after being modified by nano-Pt / carbon black composite surface. Compared with nano-Pt single surface modification, nano-Pt / carbon black composite surface modified electrode has better electrocatalytic activity than ethanol. The high specific surface area obtained by the surface modification of nano-carbon black and the synergistic effect of the catalytic material Pt effectively improve the electrocatalytic activity of the electrode on ethanol.