High catalytic activity of chemically activated gold electrodes towards electro-oxidation of methanol
High catalytic activity of chemically activated gold electrodes towards electro-oxidation of methanol
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DOI：
10.1016/j.electacta.2004.01.030
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发表时间：
2004-07-15
影响因子：
6.6
通讯作者：
Nowakowski, R
中科院分区：
文献类型：
--
作者：
Borkowska, Z;Tymosiak-Zielinska, A;Nowakowski, R
已在碱性溶液中的活化粗糙金电极上研究了甲醇的电氧化。电极通过金汞齐的形成和分解来激活。与光滑的多晶金电极和单晶金电极相比，甲醇的氧化在正电位低约 400 mV 时开始，并且氧化电流要高得多。对于新制备的活化金电极，氧化电流与获得的油光滑铂相似，但它随着时间的推移而减小。可以捕获 OH- 阴离子的小微晶的形成似乎是这种不寻常的催化活性的最重要因素。讨论了氧化过程对电极形貌的依赖性。 (C) 2004 Elsevier Ltd. 保留所有权利。
Electro-oxidation of methanol has been investigated on activated, rough gold electrodes in alkaline solutions. The electrodes were activated by formation and decomposition of gold amalgam. The oxidation of methanol starts at potentials about 400 mV less positive as compared with smooth poly and single crystal gold electrodes and the oxidation Current is much higher. For freshly prepared, activated gold electrodes the oxidation Current is similar to that obtained oil smooth platinum, however it diminishes with time. The formation of small crystallites, which Could trap OH- anions, seems to be the most important factor for this unusual catalytic activity. The dependence of the oxidation process on electrode topography is discussed. (C) 2004 Elsevier Ltd. All rights reserved.