氢燃料电池中钛双极板研究进展

Research Progress of Titanium Bipolar Plates in Hydrogen Fuel Cells

摘要:

钛及钛合金密度低、比强度高且在酸性环境中耐蚀性优异,在氢燃料电池双极板中具有较高的应用价值。回顾了近年来氢燃料电池用钛双极板的研究进展,详述了钛双极板表面改性技术的研究成果,包括掺杂合金元素、钛表面涂覆金属基涂层(贵金属、金属碳/氮化物等)和碳基涂层(石墨、无定型碳等)。涂层结构组织的复合化和纳米化,有利于提升钛双极板的耐蚀性、导电性和疏水性,其对于提升氢燃料电池的性能及保证其运行的稳定性和耐久性具有重要作用。

关键词:氢燃料电池;;钛合金;;双极板;;表面改性;;导电性

Abstract:

Titanium and its alloys with low density,high specific strength and excellent corrosion resistance in acidic conditions,which makes titanium and its alloys have great application value in bipolar plates of hydrogen fuel cell and attract extensive attention from scholars. In this paper,the research progress of titanium and its alloys in hydrogen fuel cell bipolar plates is reviewed. Furthermore,the research results of surface modification technology in titanium bipolar plate are studied in detail,including doping element alloying of titanium,metal-based coating( precious metals,metallic carbon/nitrides,etc.) and carbon-based coatings( graphite,amorphous carbon,etc.). Composite and nanostructure of coating structure are beneficial to improve the corrosion resistance,electrical conductivity and hydrophobicity of the titanium bipolar plate,which have a significant effect on the performance,operational stability and durability of the hydrogen fuel cell.

Key words:hydrogen fuel cell;titanium alloy;bipolar plate;surface modification;electrical conductivity