Effect of electrode Pt-loading and cathode flow-field plate type on the degradation of PEMFC

论文摘要

The electrode Pt-loading has an effect on the number of active sites and the thickness of catalyst layer,which has huge influence on the mass transfer and water management during dynamic process in PEMFCs. In this study, membrane electrode assemblies with different Pt-loadings were prepared, and PEMFCs were assembled using those membrane electrode assemblies with traditional solid plate and water transport plate as cathode flow-field plates, respectively. The performance and electrochemical surface area of cells were characterized to evaluate the membrane electrode assemblies degradation after rapid currentvariation cycles. Scanning electron microscope and transmission electron microscope were used to investigate the decay of catalyst layers and Pt/C catalyst. With the increase of Pt-loading, the performance degradation of membrane electrode assemblies will be mitigated. But higher Pt-loading means thicker catalyst layer, which leads to a longer pathway of mass transfer, and it may result in carbon material corrosion in membrane electrode assemblies. The decay of Pt/C catalyst in cathode is mainly caused by the corrosion of carbon support, and the degradation of anode Pt/C catalyst is a consequence of migration and aggregation of Pt particles. And using water transport plate is beneficial to alleviating the age of cathode Pt/C catalyst.

论文目录

• 1. Introduction
• 2. Experimental
•   2.1. Preparation of MEAs
•   2.2. Fuel cell design
•   2.3. Fuel cell test system
•   2.4. Degradation experiment conditions
•   2.5. Polarization curves
•   2.6. Cyclic voltammetry curves
•   2.7. Transmission electron microscopy
•   2.8. Scanning electron microscopy
• 3. Results and discussion
•   3.1. Electrochemical characterization of MEAs
•   3.2. Physical characterization of MEAs
• 4. Conclusions

文章来源

类型: 期刊论文

作者: Lijuan Qu,Zhiqiang Wang,Xiaoqian Guo,Wei Song,Feng Xie,Liang He,Zhigang Shao,Baolian Yi

来源: Journal of Energy Chemistry 2019年08期

年度: 2019

分类: 工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 无机化工,有机化工,电力工业

单位: Fuel Cell System and Engineering Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences,University of Chinese Academy of Sciences

基金: financially supported by the National Key Research and Development Program of China (Grant no.2016YFB0101208),NSFC-Liaoning Joint Funding (Grant no. U1508202),the National Natural Science Foundations of China (Grant no. 61433013 and 91434131)

分类号: TQ426;TM911.48

页码: 95-103

总页数: 9

文件大小: 1692K

下载量: 8