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扩散媒介材料及其特性(英文)

关键词:新能源,燃料电池,PEFC
简介:Polymer electrolyte fuel cell (PEFC) stacks usually employ bipolar plates with channels on either side for the distribution of reactants over the electrode surfaces. Figure 1 shows the cross-section of a small section from such a PEFC. At
the center of the structure is a 50μm membrane coated by two 15μm catalyst layers on either side. Surrounding this, two roughly 200 μm thick carbon-fiber paper gas-diffusion media are clearly observed. These are adjacent to two bipolar
plate sections, the anode plate on the top and the cathode plate on the bottom. The coolant channels are adjacent to the air channels in the cathode plate. The region between reactant channels consists of lands, also known as ribs. In this design, roughly half of the electrode area is adjacent to channels and half is adjacent to lands. The role of the gas-diffusion media is to transition with minimum voltage loss, from the channel-land structure of the flow field to the active area of the electrode. Although all of the current passes through these lands, effective diffusion media will promote a uniform current distribution at the adjacent catalyst layer.


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