PEMFC催化层中Nafion含量梯度优化研究

Research on the gradient optimization of Nafion contents in catalyst layer for PEMFC

提出了一种新的催化层结构,该催化层中的Nafion从内向外成梯度增大。测试显示,新结构的催化层相对于常规催化层不仅开路电压高,而且单电池性能同样优于常规催化层。CV测试结果显示,催化层中Nafion含量的变化对阴极电极中Pt催化剂活性面积影响很小;新电极不仅电阻小,而且具有良好的气体传递能力和排水能力。

A novel catalyst layer cathode structure with gradient change of Nafion content is fabricated.The measurements show that the novel catalyst layer cathode not only has higher open circuit voltage,but also has better performance of single cells in comparision with normal catalyst layer cathode in PEMFC（proton exchange membrane fuel cell）.Cyclic voltammetry（CV） test demonstrates that the change of Nafion content in the cathode don＇t nearly affect the electrochemical active surface area of Pt in electrode.The performance increment of a novel catalyst layer cathode is mainly attributed to lower resistance resulted from low Nafion content,better gas transport ability and drainability.