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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Electrocatalysis by nanoparticles: oxygen reduction on gold nanoparticles-electrodeposited platinum electrodes
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Electrocatalysis by nanoparticles: oxygen reduction on gold nanoparticles-electrodeposited platinum electrodes

机译：纳米粒子的电催化：金纳米粒子-电沉积铂电极上的氧还原

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摘要

O_2 reduction has been performed at Au nanoparticle-electrodeposited Pt electrodes (Au/Pt electrodes) in O_2-saturated 0.1 M KOH solution. Cyclic voltammetry (CV) and rotating ring-disk electrode (RRDE) techniques have been used in this investigation. Two reduction peaks were observed on the CV for the O_2 reduction at the Au/Pt electrodes. The reduction pathway of O_2 to either HO_2~- or OH~- is highly dependent on the electrode potential and the Au surface coverage of the Pt electrode as well. The Au/Pt electrodes exhibit different electrocatalytic behaviour in three potential regions: At E > -300 mV, the 2-electron reduction of O_2 to HO_2~- predominates, at -300 > E > -500 mV, the 4-electron reduction predominates, and at E < -500 mV, the 2-electron and 4-electron reduction pathways proceed concurrently. The maximum production of HO_2~- (as a major reduction product) was obtained at a potential of ca. -240 mV versus Ag|AgC|KCl(sat), which is more positive by ca. 250 mV than the corresponding value at the bulk Au electrode (i.e. -500 mV vs. Ag|AgCl|KCl(sat)). The increase of the surface coverage of Au (i.e. increase of deposition time) on the Pt electrodes leads to a loss of this activity towards the O_2 reduction to HO_2~-. At a relatively higher negative potential, i.e. at -400 mV, the 4-electron reduction of O_2 to OH~- occurs predominantly at all the examined Au/Pt electrodes with different Au loadings. Further negative increase of the potential (more negative than -400 mV) results in a partial contribution of the 2-electron reduction of O_2 with the 4-eletron reduction. This behaviour could be understood in view of the potential dependence of the amount and the nature of the adsorbed species on the Au/Pt disk electrode surface.
机译：已在O_2饱和的0.1 M KOH溶液中在Au纳米粒子上沉积的Pt电极（Au / Pt电极）进行了O_2还原。循环伏安法（CV）和旋转环盘电极（RRDE）技术已用于此研究中。在CV上观察到两个还原峰，用于Au / Pt电极上的O_2还原。 O_2还原为HO_2〜-或OH_-的还原途径也高度依赖于电极电位和Pt电极的Au表面覆盖率。 Au / Pt电极在三个电位区域表现出不同的电催化行为：在E> -300 mV时，O_2的2电子还原为HO_2〜-为主，在-300> E> -500 mV时，4电子还原为主。 ，并且在E <-500 mV时，2-电子和4-电子还原途径同时进行。 HO_2〜-（作为主要的还原产物）的最大产量是在大约2的电势下获得的。 -240 mV，相对于Ag | AgC | KCl（sat），约正。比块状Au电极上的相应值高250 mV（即，相对于Ag | AgCl | KCl（sat）为-500 mV）。在Pt电极上Au的表面覆盖率的增加（即，沉积时间的增加）导致该活性的损失，导致O_2还原为HO_2〜-。在相对较高的负电势下，即在-400 mV，O_2的4电子还原为OH_-主要发生在所有具有不同Au负载的Au / Pt电极上。电位的进一步负增加（大于-400 mV负）导致O_2的2电子还原和4电子还原的部分贡献。考虑到Au / Pt圆盘电极表面上吸附物质的数量和性质的潜在依赖性，可以理解这种行为。

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