Hydrodynamic voltammetric studies of the oxygen reduction at gold nanoparticles-electrodeposited gold electrodes
Hydrodynamic voltammetric studies of the oxygen reduction at gold nanoparticles-electrodeposited gold electrodes
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DOI：
10.1016/s0013-4686(02)00487-5
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发表时间：
2002-10-09
影响因子：
6.6
通讯作者：
Ohsaka, T
中科院分区：
文献类型：
--
作者：
El-Deab, MS;Ohsaka, T
采用旋转圆盘电极伏安法（RDE伏安法）研究了在0.5 M H2SO4溶液中，氧在金纳米颗粒电沉积金电极上的电催化还原。通过分析和比较该RIDE在不同转速下获得的极限电流数据与在本体电极上获得的数据，估计在-350 mV与Ag/AgCl/KCl的相同电位下，前者电极参与O-2电化学还原的电子数n的有效值约为4，而本体Au电极约为3 （sat.）。这表明在这种酸性介质中，H2O2在金纳米粒子-电沉积金电极上进一步还原和分解的可能性更高。采用还原解吸法在An纳米粒子-电沉积金电极上形成半胱氨酸自组装单层，以监测金纳米粒子电沉积时大块金电极比活性的变化。(C) 2002 Elsevier Science Ltd.版权所有。
The electrocatalytic reduction of oxygen at Au nanoparticles-electrodeposited Au electrodes has been studied using rotating disk electrode (RDE) voltammetry in 0.5 M H2SO4. Upon analyzing and comparison of the limiting currents data obtained at various rotation speeds of this RIDE with those obtained at the bulk An electrode, an effective value of the number of electrons, n, involved in the electrochemical reduction of O-2 was estimated to be ca. 4 for the former electrode and ca. 3 for the bulk Au electrode at the same potential of -350 mV versus Ag/AgCl/KCl(sat.). This indicates the higher possibility of further reduction and decomposition of H2O2 at Au nanoparticles-electrodeposited Au electrode in this acidic medium. The reductive desorption of the self-assembled monolayer of cysteine, which was formed on the An nanoparticles-electrodeposited Au electrode, was used to monitor the change of the specific activity of the bulk Au electrode upon the electrodeposition of the Au nanoparticles. (C) 2002 Elsevier Science Ltd. All rights reserved.