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采用半池考察了Pt/C催化剂在含不同浓度甲醇的0.5mol/L硫酸中的氧还原活性(ORR).研究发现,当甲醇浓度为0.1mol/L时,Pt/C催化剂的ORR活性最高,在催化层上热压商品NafionNRE-212膜后也出现同样趋势.线性扫描伏安曲线显示,压膜前后的Pt/C催化剂的ORR活性在含0.1mol/L甲醇的0.5mol/L硫酸中几乎没有变化.电化学阻抗谱结果表明,在该溶液中,Nafion膜的电阻比在其它电解液中低,这可能是导致Pt/C催化剂ORR活性提高的主要原因.有必要关注Nafion膜的这一异常性质并通过特殊设计后用于电池堆,以提高燃料电池性能.
The ORR of Pt / C catalyst in 0.5 mol / L H2SO4 with different concentrations of methanol was investigated using a half cell.The results showed that the ORR activity of Pt / C catalyst was the highest when the concentration of methanol was 0.1 mol / L , The same tendency also appeared after pressing the commercial NafionNRE-212 film on the catalyst layer.The linear sweep voltammetry showed that the ORR activity of the Pt / C catalyst before and after the lamination was in 0.5 mol / L sulfuric acid containing 0.1 mol / L methanol Almost no change.Electrochemical impedance spectroscopy results show that in this solution, Nafion membrane resistance than other electrolytes low, which may lead to ORR activity of Pt / C catalyst is the main reason it is necessary to focus on this Nafion membrane An unusual property and used in a specially designed battery stack to improve fuel cell performance.