Stainless steel as a bipolar plate material for solid polymer fuel cells
Stainless steel as a bipolar plate material for solid polymer fuel cells
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DOI：
10.1016/s0378-7753(99)00524-8
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发表时间：
2000-03-01
影响因子：
9.2
通讯作者：
Rowen, SJ
中科院分区：
文献类型：
--
作者：
Davies, DP;Adcock, PL;Rowen, SJ
固体聚合物燃料电池（SPFC）的不锈钢双极板与传统的石墨材料相比具有许多优点。这些优点包括相对低的成本、高强度、易于制造，并且由于它们可以成形为薄片，所以功率/体积比显著提高。然而，金属双极板和膜电极组件（MEA）的界面欧姆损失会降低SPFC的总功率输出。尽管有大量的市售合金，但316不锈钢传统上一直是双极板的首选合金。已经根据表面氧化膜的电阻评估了许多替代等级的不锈钢。这表明，燃料电池性能中表现出的欧姆损失根据不锈钢合金的元素组成而变化。选择310、316和904 L三种不锈钢合金作为候选双极板材料。观察到增加的极化，其顺序为904 L < 310 < 316。这在整个持续的耐久性测试中得以保持，其中这些电池已经运行超过3000小时而没有显著的性能退化。极化行为的这种差异归因于氧化膜厚度的变化。分析表明对双极板表面没有有害影响，也没有腐蚀迹象。(C)2000 Elsevier Science S.A. All rights reserved.
Stainless steel bipolar plates for the Solid Polymer Fuel Cell (SPFC) offer many advantages over conventional graphitic materials. These include relative low cost, high strength, ease of manufacture and as they can be shaped into thin sheets, significant improvement in the power/volume ratio. However, interfacial ohmic losses across the metallic bipolar plate and the Membrane Electrode Assembly (MEA), reduce the overall power output from a SPFC. Despite a large range of commercially available alloys, 316 stainless steel has traditionally been the alloy of choice for bipolar plates. A number of alternative grades of stainless steel have been evaluated in terms of the electrical resistance of their surface oxide film. This showed that ohmic losses exhibited in fuel cell performance varied depending on the elemental composition of the stainless steel alloy. Three stainless steel alloys, 310, 316 and 904L, were chosen as candidate bipolar plate materials. Increased polarisation was observed in the order 904L < 310 < 316. This was maintained throughout an ongoing endurance test, where these cells have been run for over 3000 h without significant performance degradation. This difference in polarisation behaviour was attributed to variation in thickness of the oxide film. Analysis has shown no deleterious effect on the surface of the bipolar plate and no evidence of corrosion. (C) 2000 Elsevier Science S.A. All rights reserved.