DEFC不锈钢双极板的电化学行为研究

Research on electrochemical behaviour of stainless steel bipolar plate

为评估金属双极板在直接乙醇燃料电池(DEFC)环境中的耐蚀性能,采用50℃的0.05 mol/L H2SO4+x mol/L CH3CH2OH(x=0,1,5,10,13)溶液来模拟DEFC的阳极运行环境,在该环境中对304不锈钢(304SS)的表面形貌进行表征,并对其进行极化、恒电位时间-电流密度等电化学测试.结果表明,在高浓度的乙醇腐蚀溶液中,304SS表面局部腐蚀的现象有所缓和,其耐蚀性能较好;乙醇起到减缓304SS在0.05 mol/L H2SO4溶液中腐蚀速率的作用;304SS在乙醇浓度高的DEFC运行环境中具有较高的稳定性.

In order to evaluate the corrosion resistance of metal bipolar plate in direct ethanol fuel cell（ DEFC） environment,a solution of 0. 05 mol/L H2SO4＋ x mol/L CH3CH2OH（ x = 0,1,5,10,13） was used to simulate DEFC anode operating environment. In the environment,the surface morphology of 304 stainless steel（ 304SS） was characterized,and the electrochemical tests were carried out for polarization and constant current time-current density. The results showed that ethanol had not much effect on 304 SS corrosion potential. Ethanol played a role in slowing the corrosion rate of 304 SS in 0. 05 mol/L H2SO4 solution. 304 SS had a high stability in DEFC operating environment with high ethanol concentration.