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Chemical aging of the silicone rubber in a simulated and three accelerated proton exchange membrane fuel cell environments
LI Guo 1 #,TAN Jinzhu 2,GONG Jianming 2 *
1.School of Mechanical and Power Engineerng, Nanjing university of technology, NanJing 211816
2.School of Mechanical and Power Engineerng, Nanjing university of technology, 211816
*Correspondence author
#Submitted by
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Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China (No.200802910004 ), the Natural Science Foundation of China(No.51175241), innovation Program for Graduate 270 Students in Nanjing University of Technology(No.No.BSCX200904), Research and Innovation Project for College Graduates of Jiangsu Province in China (No.CXZZ11_0335)
Opened online:22 March 2012
Accepted by: none
Citation: LI Guo,TAN Jinzhu,GONG Jianming.Chemical aging of the silicone rubber in a simulated and three accelerated proton exchange membrane fuel cell environments[OL]. [22 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4470697
 
 
Long-term stability and durability of gaskets in Proton Exchange Membrane (PEM) fuel cell are important to both sealing and the electrochemical performance of PEM fuel cells. In this paper, the time-dependent aging process of silicone rubber, which is one of the potential gasket materials for PEM fuel cells, is investigated in one simulated PEM fuel cell environment and three accelerated durability test (ADT) media at 70 oC. Optical microscopy is employed to observe the topographical changes on the surfaces of samples. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) are used to study the surface chemistry of the samples before and after exposure to the test environments over time. The optical microscopy results indicate that the surface conditions of the samples change from initially smooth to rough, crack appearance and finally crack propagation. The ATR-FTIR and XPS results reveal that the degradation mechanisms of the silicone rubber are likely due to the de-crosslinking and chain scission in the backbone,and the acid has a significant effect on the degradation.
Keywords:degradation; silicone rubber; PEM fuel cell; X-ray photoelectron spectroscopy
 
 
 

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