非水体系中单分子层保护团簇在超微铂电极上的量子化充电  

Quantized Capacitance Charging of Monolayer-protected Clusters on Pt Ultramicroelectrode

作　　者：周培[1] 胡效亚[1] 王赪胤[1] 郭荣[1] 

机构地区：[1]扬州大学瘦西湖校区化学化工学院,扬州225002

出　　处：《应用化学》2004年第2期117-121,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金 ( 2 0 175 0 2 3 );江苏省政府自然科学基金 (BK2 0 0 2 0 45 )资助项目

摘　　要：用示差脉冲伏安法和循环伏安法比较了单层保护金团簇 (MPC)在超微铂电极和常规铂电极上 ,在四氢呋喃 (THF)溶液中的量子化充电行为。结果表明 ,超微铂电极表征MPC的电化学性质具有许多优越性。在没有电解质的 0 1mol/L己硫醇保护的金MPC的THF溶液中 ,超微铂电极示差脉冲伏安扫描谱上可以出现 6对明显的量子化充电峰。在高速扫描的情况下 ,仍显示良好的电化学可逆性。单阶跃计时库仑法的研究表明 ,每对量子充电峰对应于 1个电荷的充放电。The behavior of quantized capacitance charging of the monolayer protected clusters(MPC) in tetrahydrofuran(THF) solution on the platinum ultramicroelectrode and bulk Pt electrode have been investigated for comparison. The results showed that MPC has many advantages over the bulk Pt electrode. With platinum microelectrode, there are six pairs of quantized capacitance charging peaks on the differential pulse cyclic voltammograms in 0.1 mol/L THF solution of hexanethiol protected MPC without electrolyte, and good electrochemical reversibility of the peaks could be observed even at high scan rate in cyclic voltammogram. The single potential step chronocoulometric experiments displayed that each quantized capacitance charging peak corresponds to one electron transfer across the interface of the MPC.

关 键 词：超微铂电极 单层保护团簇 量子化电容充电 

分 类 号：O657.1[理学—分析化学]