کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288140 1498027 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Degradation of the elastomeric gasket material in a simulated and four accelerated proton exchange membrane fuel cell environments
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Degradation of the elastomeric gasket material in a simulated and four accelerated proton exchange membrane fuel cell environments
چکیده انگلیسی

Long-term stability and durability of gaskets in Proton Exchange Membrane (PEM) fuel cell are critical to both sealing and the electrochemical performance of the PEM fuel cell. In this paper, the time-dependent chemical degradation of the silicone rubber, which is one of the potential gasket materials for PEM fuel cells, is studied in a simulated PEM fuel cell environment and four accelerated durability test (ADT) media for short-term aging tests at 70 °C. The weight loss of samples is monitored. The optical microscopy is used to show the topographical changes on the sample surface. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) are employed to study the surface chemistry of the samples before and after exposure to the test environments over time. The results show that the weight loss increases with the exposure time. The optical microscopy reveals that the surface conditions of the samples changes from initially smooth to rough, crack appearance and finally crack propagation. The ATR-FTIR and XPS results show that the surface chemistry changes significantly via de-crosslinking and chain scission in the backbone for the samples exposed to the environments over time.


• Weight loss increased with the concentration of the acidic solution over time.
• Degradation started from surface roughness and finally cracks for the sample after exposure.
• Surface chemistry changed significantly as an indication of the chemical degradation.
• Hydrofluoric (HF) acidic solution could accelerate the aging of the silicone rubber.
• Aging mechanisms could be due to de-crosslinking and chain scissoring in the backbone.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 205, 1 May 2012, Pages 244–251
نویسندگان
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