Degradation analysis of the core components of metal plate proton exchange membrane fuel cell stack under dynamic load cycles |
| |
Affiliation: | 1. School of Automotive Studies, Tongji University (Jiading Campus), 4800 Cao''an Road, Shanghai, 201804, China;2. Clean Energy Automotive Engineering Center, Tongji University (Jiading Campus), 4800 Cao''an Road, Shanghai, 201804, China;3. Weichai Power Co., Ltd, Weifang, 261000, China;4. Shandong Heavy Industry Group Co., Ltd, Jinan, 250013, China;5. Henan YuQing Power Co., Ltd, 416 Muye Road, Xinxiang, 453000, China |
| |
Abstract: | The durability of metal plate proton exchange membrane fuel cell (PEMFC) stack is still an important factor that hinders its large-scale commercial application. In this paper, we have conducted a 1000 h durability test on a 1 kW metal plate PEMFC stack, and explored the degradation of the core components. After 1000 h of dynamic load cycles, the voltage decay percentage of the stack under the current densities of 1000 mA cm?2 is 5.67%. By analyzing the scanning electron microscopy (SEM) images, the surfaces of the metal plates are contaminated locally by organic matter precipitated from the membrane electrode assembly (MEA). The SEM images of the catalyst coated membrane (CCM) cross section indicate that the MEA has undergone severe degradation, including the agglomeration of the catalyst layer, and the thinning and perforation of the PEM. These are the main factors that cause the rapid increase in hydrogen crossover flow rate and performance decay of the PEMFC stack. |
| |
Keywords: | PEMFC stack MEA Durability Dynamic load cycle Degradation mechanism |
本文献已被 ScienceDirect 等数据库收录! |
|