摘要
有机小分子的燃料电池具有重要的应用前景,人们对它在贵重金属上的电催化氧化进行了大量研究。Pd具有不同于其它贵重金属的特性,在甲酸氧化中表现出与其它金属不同的电催化机理。Gholamian报道了将Pt微粒修饰聚苯胺电极对甲酸氧化的电催化研究,我们发现以多聚磷酸作为支持电解质所聚合的聚苯胺(PAN)再修饰金属原子方面具有其独特之处,并且用Pt进行再修饰之后对甲酸氧化的催化活性明显高于文献[4]的报道。因此本实验选用多聚磷酸为支持电解质电聚合苯胺,然后将钯微粒嵌入沉积到PAN中,并研究其对甲酸氧化的电催化作用。
Pd micropartieles modified by polyaniline (PAN (Pd)) which was obtained by using H_6P_4O_(13) as supporting electrolyte exhibited a considerably higher catalytic activity in oxidation of formic acid than the bare Pd electrode. Incorporation of Pd microparticles in PAN films were made by potential cycling between—0. 2V and 0. 5V(vs. SCE) in 0. 01mol/L PdCl_4^(2-) in about 15 Min. The catalytic activity was found in dependence on the size of the Pd particles, affected by the morphology of PAN film used. The XPS and electrochemical results reveal that the electrocatalytie mechanisms are different at the PAN(Pd) and bare Pd electrodes.
出处
《应用化学》
CAS
CSCD
北大核心
1993年第4期55-57,共3页
Chinese Journal of Applied Chemistry
关键词
电催化
聚苯胺
钯微粒
甲酸
formic acid, oxidation, elecrtocatalysis, polyaniline, Pd microparticle
