Rh electrodeposition on Pt in acidic medium: a study using cyclic voltammetry and an electrochemical quartz crystal microbalance

被引：51
|
作者：
Oliveira, RTS [1 ]
Santos, MC [1 ]
Bulhoes, LOS [1 ]
Pereira, EC [1 ]
机构：
[1] Univ Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Eletroquim & Ceram, Ctr Multidisciplinar & Desenvolvimento Mat Ceram, BR-13560970 Sao Carlos, SP, Brazil
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2004年 / 569卷 / 02期
基金：
巴西圣保罗研究基金会;
关键词：
rhodium; EQCM; Pt electrodes; electrodeposition;
D O I：
10.1016/j.jelechem.2004.03.006
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This paper describes Rh electrodeposition on Pt electrodes in HClO4 solutions. Using cyclic voltammetry (CV), coupled with electrochemical quartz crystal microbalance (EQCM) studies, we determined the main characteristics related to oxide formation on rhodium deposited on platinum. During the deposition, the results demonstrated that Rho ad-atoms are stable on Pt in the potential range investigated at different saturation coverages. Data obtained using EQCM and CV show that the number of electrons transferred in the oxidation of Rh-ads on Pt is 3 and a Rh(OH)(3) species was proposed as the adsorbed product. At potentials higher than 1.0 V, Rh(OH)(3) is oxidized to RhO(OH)(3). This species is reduced to Rh(OH)3 and then to Rho during the negative potential sweep. (C) 2004 Elsevier B.V. All rights reserved.
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页码：233 / 240
页数：8
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