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000873871 1001_ $$0P:(DE-Juel1)171752$$aQiu, Diankai$$b0$$eCorresponding author
000873871 245__ $$aElectrical resistance and microstructure of typical gas diffusion layers for proton exchange membrane fuel cell under compression
000873871 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2018
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000873871 520__ $$aElectrical resistance accounts for a significant part of the performance loss in proton exchange membrane fuel cells. To the best of the authors’ knowledge, this work represents the first direct experimental investigation and comparison of the bulk resistance and microstructure of commercially available gas diffusion layers, carbon paper, carbon cloth and carbon felt, under cyclic and steady loads, which are typical compression conditions in the fuel cell. It was found that with the improvement of contact conductivity between gas diffusion layer and bipolar plate, the bulk resistance of gas diffusion layer accounts for as much as 20% of the resistance in the fuel cell, especially when the assembly pressure is high enough. Experimental results indicate that three kinds of gas diffusion layers show various electrical behaviors under compression due to their different fiber structures. For carbon paper, the resistance displays a gradual decline as the load cycles increases. A reduction in the resistance and obvious fiber cracks are observed when the compression pressure exceeds the “break stress” of 2.0 MPa. For woven carbon cloth, more uniform decline of the resistance is caused by the increasing fiber cracks, which are pulled and bent in the middle of a weave. Although felt gas diffusion layer features the lowest electrical conductivity, its tortuous and thick fibers lead to higher stability in electric resistance and microstructure than bonded carbon paper and woven carbon cloth. This study is helpful for enhancing our understanding of the relationship between electrical resistance and compression loads in the fuel cell with various gas diffusion layers.
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000873871 7001_ $$0P:(DE-Juel1)129863$$aJanßen, Holger$$b1
000873871 7001_ $$0P:(DE-HGF)0$$aPeng, Linfa$$b2
000873871 7001_ $$0P:(DE-Juel1)169777$$aIrmscher, Philipp$$b3
000873871 7001_ $$0P:(DE-HGF)0$$aLai, Xinmin$$b4
000873871 7001_ $$0P:(DE-Juel1)129883$$aLehnert, Werner$$b5
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