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为降低质子交换膜燃料电池(PEMFC)的生产成本,选择成本低廉、强度高、化学稳定性好的不锈钢材料替代传统的石墨双极板.以304不锈钢为研究对象,采用电化学方法测定其在模拟PEMFC环境下的极化曲线和对应于PEMFC工作电位下的恒电流极化曲线,用伏安法测量304不锈钢表面氧化膜/钝化膜与碳纸之间的接触电阻.结果表明,在模拟PEMFC环境中,304不锈钢钝化电流密度低于16μA/cm2,电流没有出现明显的波动;304不锈钢在模拟PEMFC环境中表面生成的钝化膜的接触电阻大于空气中形成的氧化膜的接触电阻.
In order to reduce the production cost of proton exchange membrane fuel cell (PEMFC), the selection of low cost, high strength, good chemical stability of stainless steel material to replace the traditional graphite bipolar plate.Take 304 stainless steel as the research object, using electrochemical methods to determine its The polarization curve of PEMFC and the galvanostatic polarization curve corresponding to the working potential of PEMFC were simulated and the contact resistance between 304 stainless steel oxide / passivation film and carbon paper was measured by voltammetry.The results show that in the simulation Passivation current density of 304 stainless steel is less than 16μA / cm2 in PEMFC environment, and there is no obvious current fluctuation. The contact resistance of passivation film formed on surface of 304 stainless steel in simulated PEMFC environment is greater than the contact resistance of oxide film formed in air.