In-situ Studies of Hydrogen Oxydation Reaction in Proton Exchange Membrane fuel Cells

Abstract

高性能和长寿命是实现质子交换膜燃料电池商业化的重要基础。在最佳电池运行条件下,阴极性能的衰减远比阳极性能显著,但在一般运行条件下阳极对电池整体性能的影响却不清楚。本论文通过系统考察两种商用催化剂(PtRu/C和Pt/C)的氢氧化行为,试图建立起现场电化学表征体系,获得在可控运行条件下,电池阳极的氢氧化反应规律及对寿命性能的影响。 通过选择合适的交流阻抗等效电路并结合其他电化学方法如塔菲尔曲线、极化曲线和循环伏安等技术确认了与氢氧化反应对应的重要参数:传荷电阻Rct和双电层充电电容Cdl及与氢吸附密切相关的Rad和Cad,系统考察了附加电位、氢气流速、工作温度、相对湿度、放电电流密度及加载方式...High performance and excellent durability are practically important for the commercialization of proton exchange membrane fuel cells. It is widely accepted that under the optimal operating condition the sluggish oxygen reduction in the cathode mainly limits the cell performance when compared with the fast hydrogen oxidation in the anode. However, in the conventional operation the significance of ...学位:理学硕士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:1912005130187

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