Creation of Surface Structures with High Corrosion Resistance forPt Catalyst of Fuel Cell

为提高聚合物电解质燃料电池铂催化剂的耐久性，研究了晶向和晶界对铂电化学性能的影响。微电化学电池系统使得能够在多晶Pt中的单个平面上进行电化学测量，并且发现在Pt（110）表面上检测到的Pt氧化电流密度高于Pt（100）表面。晶界引起氧化电流的增加。这一结果意味着晶界是多晶Pt中氧化的主要部位。

The influence of crystal orientation and grain boundary on the electrochemical property of Pt was studied to improve the durability of Pt catalyst in polymer electrolyte fuel cell. A microelectrochemical cell system enabled the electrochemical measurements on single planes in a polycrystalline Pt, and it was found that higher current densities by Pt oxidation was detected on the Pt(110) surface than Pt(100). Grain boundaries caused the increase of the oxidation current. This result implies the grain boundary is a predominant site of oxidation in a polycrystalline Pt.