碱性膜燃料电池阳极双催化层结构与性能研究

Structure and Performance of Anode Dual Catalyst Layer for Anion-Exchange Membrane Fuel Cell

改善阳极水管理是碱性阴离子交换膜(AEM)燃料电池重要的研究课题.在质子交换膜燃料电池(PEMFC)阴极研究中,发现改变催化层内部结构能够有效改善阴极的水管理能力,然而目前关于AEM燃料电池催化层相关研究较少.本研究针对AEM燃料电池阳极水分布特点,利用Pt/C和PtRu/C催化剂在碱性条件下氢氧化反应(HOR)的活性差异,设计了双层催化剂结构.当活性较高的PtRu/C层靠近气体扩散层,活性较低Pt/C层靠近AEM时,双催化层形成与单一催化层水分布相反的活性梯度,能够有效改善水分布,在测试温度为30℃和100%相对湿度时,获得较高峰值功率密度88.1 mW/cm^(2).研究成果为碱性膜燃料电池的阳极催化层结构设计提出一种新思路.

Improving water transport behavior within the anode catalyst layer is an important research topic for anionexchange membrane(AEM)fuel cells.For proton-exchange membrane fuel cells(PEMFCs),the catalyst layer mi-crostructure has been found to significantly influence the water management,while there is a lack of study on the anode catalyst layer for AEM fuel cells.In this work,we utilize the hydrogen oxidation reaction(HOR)activity difference between Pt/C and PtRu/C catalysts to design anode dual catalyst layers(ADCLs)to improve the water management.The results indicate that the ADCL with the PtRu/C layer close to the gas diffusion layer and the Pt/C close to the AEM form a reactivity gradient that is opposite to the water gradient in the PtRu/C or Pt/C catalyst layer,leading to better water transport in the anode.At 30℃and a relative humidity of 100%,the maximum peak power density was achieved as 88.1 mW/cm^(2).The results of this study will provide a novel idea for the design of anode catalyst layers in AEM fuel cells.