Local impact of humidification on degradation in polymer electrolyte fuel cells

JOURNAL OF POWER SOURCES

卷:352

Article

Sanchez, Daniel G.¹  Ruiu, Tiziana¹  Biswas, Indro¹  Schulze, Mathias¹  Helmly, Stefan¹  Friedrich, K. Andreas^1,2 

[1] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Tech Thermodynam, D-70569 Stuttgart, Germany

[2] Univ Stuttgart, Inst Energy Storage, Pfaffenwaldring 31, D-70569 Stuttgart, Germany

关键词: PEFC;    Water management;    Degradation;    Local measurements;    Current density distributions;   

DOI  :  10.1016/j.jpowsour.2017.03.057

来源: Elsevier

【 摘 要 】

The-water level-in-a polymer electrolyte membrane fuel cell (PEMFC) affects the durability as is seen from the degradation processes during operation a PEMFC with fully-and nonhumidified gas streams as analyzed using an in-situ segmented cell for local current density measurements during a 300 h test operating under constant conditions and using ex situ SEM/EDX and XPS post-test analysis of specific regions. The impact of the RH on spatial distribution of the degradation process results from different water distribution giving different chemical environments. Under nonhumidified gas streams, the cathode inlet region exhibits increased degradation, whereas with fully humidified gases the bottom of the cell had the higher performance losses. The degradation and the degree of reversibility produced by Pt dissolution, PTFE defluorination, and contaminants such as silicon (Si) and nickel (Ni) were locally evaluated. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free