Study on influence factors of Commercial large size MEA for PEMFC 2020-01-1171
Proton exchange membrane fuel cell (PEMFC), which converts the chemical energy of fuels into electrical energy directly through electrochemical reactions, is widely considered as one of the best power source for new energy vehicles (NEV) because of its high power density, high energy conversion efficiency, no pollution, low noise, fast startup and low operating temperature. The Membrane Electrode Assembly (MEA) is the core component of fuel cell, which composes proton exchange membrane catalyst layers (CL) and gas diffusion layers (GDL). The MEA play an important role in the mass transportation and electrochemical reaction. The MEA not only plays a key role for the performance of the PEMFCs, but also for the reducing the cost of the fuel cells, as well as accelerating the commercial applications. Commercialized large-size MEA directly plays a major role in determining fuel cell stack and vehicle performance. In this paper, commercial samples A and B from two different batches of the MEA production line are tested. Compared with the polarization curve, the current density of sample A and sample B are 1.25A/cm2 and 1.86A/cm2 respectively. In terms of current density, the result of sample B is 47% higher than the one of Sample A. In addition, the morphology and electrochemical test are used to explain reason for the different performance between sample A and sample B. According to the result, it can be seen that the active area of the catalyst in sample B is larger than that in sample A. Meanwhile, the pore size and blow-hole rate of the GDL in sample B is larger than that in sample A. Thus, the performance of sample B is better than that of sample A.
Tiancai Ma, Jinghui Zhao, Yanbo Yang, Weikang Lin