36 Cl labelling and electrochemical study of chloride adsorption on a gold electrode from perchloric acid media
36 Cl labelling and electrochemical study of chloride adsorption on a gold electrode from perchloric acid media
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36 Cl 标记和高氯酸介质中金电极上氯化物吸附的电化学研究
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发表时间：
1996
期刊：
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通讯作者：
A. Wiȩckowski
中科院分区：
文献类型：
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作者：
A. Kolics;Aliston E. Thomas;A. Wiȩckowski
我们目前的实验数据上吸附的氯离子在光滑的多晶金电极使用36 Cl放射性标记法。由于来自36 Cl辐射源的微弱信号，以前的放射化学研究是用粗糙的基底进行的。放射化学过程包括“压缩效率”和二次X辐射的贡献的评估，以及一个新的校准计划维斯于我们以前的努力。使用这种新的放射化学方法结合循环伏安法，我们研究了吸附和表面-本体交换过程的电位依赖性，并比较了氯化物和硫酸盐的吸附。在双电层电位范围内，证实了已报道的氯离子表面浓度（r）-电极电位关系。在氧化范围内获得的Γ与E曲线反映了金在氯化物介质中的丰富表面化学性质，即金氧化物的吸附性质和金与氯化物形成的络合物。综合了解氯离子的电吸附和反应性在整个电极电位范围内访问的调查在水溶液中概述了基于本研究中获得的实验材料。
We present experimental data on adsorption of chloride anions on a smooth polycrystalline gold electrode using the 36Cl radioactive labelling method. Owing to weak signal from the 36Cl radiation source, previous radiochemical studies had been done with rough substrates. The radiochemical procedure includes the evaluation of a ‘squeezing efficiency’ and a contribution from secondary X-radiation, as well as a new calibration scheme vis-a-vis our previous efforts. Using this new radiochemical approach in combination with cyclic voltammetry, we studied the potential dependence of adsorption and surface–bulk exchange processes, and compared chloride and sulfate adsorption. In the double layer potential range, the already reported chloride surface concentration (Γ)–electrode potential relationships were confirmed. The Γ vs. E profiles taken in the oxidation range reflected a rich surface chemistry of gold in chloride media in terms of sorption properties of gold oxides and formation of gold complexes with chloride. An integrated understanding of chloride electrosorption and reactivity in the full electrode potential range accessible to investigations in aqueous solution is outlined based upon the experimental material obtained in this study.