以纳米Pd, Pd-Ru, Au和Au-Ru为碱性直接醇燃料电池非Pt阳极催化剂,考察了其对甲醇、乙醇和乙二醇的电氧化性能. 结果表明, Pd在酸中对醇电氧化的催化活性很低,但在碱中表现出较高的催化活性,起波电势约为0.4 V(vs RHE); 引入Ru助催化剂后,起波电势负移约0.15 V; Pd-Ru对乙醇的电氧化表现出很高的活性,在0.3～0.4 V电势范围内其活性为Pt-Ru的4倍. Au在酸中几乎不催化醇类分子的电氧化,但在碱中表现出一定的催化活性,在高于0.6 V(vs RHE)的电势范围内可观察到醇氧化阳极电流. Au-Ru的催化活性高于Au, 但起波电势没有明显负移,这可能表明当电势不足够正时醇分子在Au表面的吸附脱氢步骤是速率控制步骤.
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