组装在贵金属基底上的金纳米粒子对CO的电化学催化氧化

Electrocatalytic Oxidation of CO on Gold Nanoparticles Assembled on Bulky Noble Metal Substrates

研究了组装在Au,Pt电极表面的金纳米粒子对CO的电化学催化氧化行为,首次在实验上观察到较大粒径金纳米粒子(粒径>10nm)对CO的电催化氧化活性.考察了金粒子表面金氧化物对粒子电催化活性的影响,发现表面金氧化物的形成是金纳米粒子对CO具有电催化氧化活性的前提.对于相同粒径的金纳米粒子,随着粒子表面金氧化物量的增加,催化活性增大.

Gold nanoparticles （AuNPs） have been successfully deposited on bulky gold and platinum electrode＇s by a self-assembly method, and the electrocatalytic activity of AuNPs has been studied in detail by cyclic voltammetry in a CO saturated alkaline solution. The experimental results show that, compared with bulky gold, the AuNPs assembled both on Au and Pt electrodes exhibit well-distinguishable electrocatalyic activity toward CO. This is the first report about the electrocatalytic oxidation of CO on gold nanoparticles with a diameter larger than 10 nm. Furthermore, the effect of gold oxides on the electrocatalytic activity of AuNPs has been investigated. It was shown that formation of a gold oxide layer on the surface of AuNPs was one of the key steps for the electrocatalytic oxidation of CO on Au and Pt supported gold nanoparticles. For AuNPs with the same diameter, the more the amount of gold oxide on their surface, the higher the electrocatalytic activity for CO oxidation.