Electrocatalytic Activity of Gold and Gold Nanoparticles Improved by Electrochemical Pretreatment

被引:74
作者
Shim, Jun Ho [1 ]
Kim, Jiyoung [1 ]
Lee, Chongmok [1 ]
Lee, Youngmi [1 ]
机构
[1] Ewha Womans Univ, Dept Chem & Nano Sci, Seoul 120750, South Korea
关键词
OXYGEN REDUCTION REACTION; POLYCRYSTALLINE GOLD; ELECTRODE; SURFACE; STATES;
D O I
10.1021/jp1067507
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrocatalytic activity of bulk Au and Au nanoparticles (AuNPs) toward the oxygen reduction reaction (ORR), before and after the electrochemical pretreatment, was investigated in a 0.05 M phosphate buffer solution (pH = 7.4). Both the Au and AuNPs were pretreated by repetitive potential cycling between -0.2 and +1.0 V (vs SCE). Rotating disk electrode (RDE) voltammetric studies showed that a more favorable ORR occurred at the AuNPs than at the Au. Interestingly, increased number of electrons (n) transferred in the ORR (similar to 4) and more positive ORR onset potential were observed at both the Au and AuNPs after the pretreatment. In particular, for the bulk Au, a simple electrochemical pretreatment produced remarkably improved ORR activity, i.e., a considerable positive shift in the ORR onset potential by similar to 300 mV as well as a significant increase in the number (from <2 to similar to 4). The greatest catalytic activity was observed at the pretreated AuNPs. The enhanced catalytic activity by the electrochemical pretreatment was attributed to the formation of thick Au oxide layers, which was also demonstrated with a thermally pretreated Au microwire electrode. The pretreated Au and AuNPs also showed higher activity toward the oxidation of hydrogen peroxide than the corresponding untreated ones.
引用
收藏
页码:305 / 309
页数:5
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