Long-term durability of HT-PEM fuel cells based on thermally cross-linked polybenzimidazole

JOURNAL OF POWER SOURCES

卷:342

Article

Sondergaard, Tonny¹  Cleemann, Lars Nilausen¹  Becker, Hans¹  Aili, David¹  Steenberg, Thomas²  Hjuler, Hans Aage²  Seerup, Larisa¹  Li, Qingfeng¹  Jensen, Jens Oluf¹ 

[1] Tech Univ Denmark, Dept Energy Convers & Storage, Kemitorvet 207, DK-2800 Lyngby, Denmark

[2] Danish Power Syst Ltd, Egeskovvej 6C, DK-3490 Kvistgard, Denmark

关键词: Durability;    Polymer electrolyte membrane;    Fuel cell;    Polybenzimidazole;    Cross-linking;    Thermally cured;   

DOI  :  10.1016/j.jpowsour.2016.12.075

来源: Elsevier

【 摘 要 】

Long-term durability of high temperature polymer electrolyte membrane fuel cells based on thermally cross-linked polybenzimidazole membranes was studied and compared with reference membranes based on linear polybenzimidazole. The test was conducted at 160 degrees C under constant load currents of 200 mA cm(-2) for periods of 1000, 4400, and 13,000 h. Extensive beginning-of-life (BoL) and end-of-test (EoT) characterisation was carried out, and disturbance of the steady state operated cells was minimised by limiting in-line diagnostics to the low-invasive technique of electrochemical impedance spectroscopy (EIS). Up until the operating time of 9200 h, the cell equipped with the cross-linked membrane showed an average degradation rate of 0.5 mu V h(-1), compared to 2.6 mu V h(-1) for the reference membrane, though parallel tests for a shorter period of time showed deviations, likely due to malfunctioning contact between layers or cell components. For the full test period of 13,000 h, the average voltage decay rate was about 1.4 and 4.6 mu V h-1 for cells equipped with cross-linked and linear polybenzimidazole membranes, respectively. EIS and post-test analysis revealed that the cross-linked membrane showed better stability in terms of area specific resistance due to improved acid retention characteristics. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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