The electrocatalytic properties of the oxides of noble metals in the electro-oxidation of some organic molecules
The electrocatalytic properties of the oxides of noble metals in the electro-oxidation of some organic molecules
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DOI：
10.1016/s0022-0728(96)04787-0
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发表时间：
1997-02-28
影响因子：
4.5
通讯作者：
Popic, J
中科院分区：
文献类型：
--
作者：
AvramovIvic, M;Jovanovic, V;Popic, J
有机化合物在金和银电极上的电氧化既可以发生在比形成金属氧化物的电位更负的电位范围内，也可以发生在表面被氧化物覆盖的更正的电位范围内。甲醇在金电极上的氧化在电极未被氧化物覆盖的电位范围内进行，并且仅以最慢的扫描速度（0.1 mV s(-1)）进行。在相同扫描速率下，Au（110）取向和Au（111）取向有利于氧化区甲醇阳极电氧化的催化活化。苹果酸在金电极上的氧化仅在电极被氧化金覆盖的区域进行。在由银修饰的玻碳电极上，在电极被氧化银覆盖的区域观察到甲醛阳极氧化的再活化。在大块银电极和由银修饰的玻碳电极上，醇类如甲醇、乙二醇和甘油仅在电极被氧化银覆盖的区域被氧化。在这样的电极上，观察到的阳极电流按顺序增加：甲醇<乙二醇<甘油，并且在相同的顺序中，相应的峰出现在更多的负电位处。(C) 1997 Elsevier Science S.A.
The electro-oxidation of organic compounds on gold and silver electrodes can occur either in a potential range more negative than that where the metal oxides are formed or within the more positive range where the surface is covered by oxides. Oxidation of methanol on gold electrodes proceeds in the potential range where the electrode is not covered with oxide and only at the slowest scan speed used (0.1 mV s(-1)). At the same scan rate the Au(110) orientation as well as the Au(111) orientation favor the catalytic activation of the anodic electro-oxidation of methanol in the region of oxide formation. Oxidation of malic acid on a gold electrode proceeds only in the region where the electrode is covered by gold oxide. On a glassy carbon electrode modified by silver, reactivation of the formaldehyde anodic oxidation is observed in the region where the electrode is covered by silver oxide. On the bulk silver electrode and on the glassy carbon electrode modified by silver, alcohols such as methanol, ethylene glycol and glycerol are oxidized only in the region where the electrodes are covered by silver oxide. On such electrodes the observed anodic currents increase in the sequence: methanol < ethylene glycol < glycerol, and in the same sequence the corresponding peaks occur at more negative potentials. (C) 1997 Elsevier Science S.A.