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化学进展 2009, Vol. 21 Issue (0708): 1687-1692 前一篇   后一篇

• 综述与评论 •

PEMFC金属双极板及其表面改性的研究进展

田如锦*   

  1. (大连交通大学材料科学与工程学院    |大连 116028)
  • 收稿日期:2008-09-08 修回日期:2008-12-04 出版日期:2009-08-24 发布日期:2009-06-30
  • 通讯作者: 田如锦 E-mail:rjtian_88@yahoo.com.cn
  • 基金资助:

    无

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Metal Bipolar Plate for PEMFC and Its Surface Modification

Tian Rujin*   

  1. (College of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China)
  • Received:2008-09-08 Revised:2008-12-04 Online:2009-08-24 Published:2009-06-30
  • Contact: Tian Rujin E-mail:rjtian_88@yahoo.com.cn

双极板是质子交换膜燃料电池（PEMFC）中重要的多功能（如分隔反应气体、集流导电等）组件之一，它不仅占整个电池组重量的70-80%和几乎全部体积，而且在电池组的生产成本中也占据相当大的比例。石墨因良好的化学稳定性和导电性而被广泛地用做双极板材料，但成本高及脆性大而阻碍了其制作低体积燃料电池和广泛市场应用。金属是具有较高的强度、导热性和气密性的良导体。同时，金属相对更易于机加工成薄板以生产低成本和体积的PEMFC电池组。因此，金属成为有力的代替者。本文详细评述了不锈钢、钛、铝及其合金以及镍基合金双极板的耐蚀性和接触电阻，并分析了采用金属双极板存在的问题以及表面改性方面的发展方向。

关键词： 金属双极板, 腐蚀, 接触电阻, 表面改性, 双极板, 腐蚀, 接触电阻, 表面改性

Bipolar plates, as important multi-functional components, connect the individual fuel cell, distribute the fuel gas and oxygen over the surfaces of the anode and cathode, conduct the electrical current from the anode of one cell to the cathode of the adjacent, support the membrane electrode assembly (MEA) and provide rigidity for the PEMFC stacks. They not only occupy 70~80% in weight of whole stack and almost whole of the volume, but also hold a considerable proportion of production cost. Traditional graphite is widely used to make the bipolar plates because of its excellent chemical stability and conductivity; nevertheless, its high brittleness and inadequate strength make it difficult to produce small size fuel cell stacks. Metals are good electrical conductors with high strength and usually have not porosities for gas permeability. In addition, metals are relatively easily machined or stamped into thin sheets, which decrease the overall cost and volume for the PEMFC stack. They are considered to be good candidates for bipolar plate materials for PEMFC. Stainless steels, titanium, aluminum and other alloys may be used as the materials for the bipolar plate. Recent research progresses in corrosion resistance and interfacial contact resistance of stainless steels, titanium, aluminum and Ni-based alloys are also reviewed systematically. Metal-based and carbon-based coatings prepared by surface modification are analyzed in this paper. The existed problems and development direct of surface modification are pointed out on this basis.

Contents
1 Surface conductivity and chemical stability of bipolar plate
2 Metal bipolar plate materials
2.1 Titanium, Aluminum and its alloys
2.2 Stainless steels
2.3 Ni-based alloys
3 Surface modification of metal bipolar plate
3.1 Metal-based coatings
3.2 Carbon-based coatings
4 Outlook

Key words: metal bipolar plate, corrosion, contact resistance, surface modification

中图分类号: 

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