THE IMPORTANCE OF ADSORPTION IN ANODIC SURFACE-CATALYZED OXYGEN-TRANSFER REACTIONS AT GOLD ELECTRODES

被引:51
作者
VITT, JE [1 ]
LAREW, LA [1 ]
JOHNSON, DC [1 ]
机构
[1] IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011
关键词
D O I
10.1002/elan.1140020106
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A large number of anodic oxygen‐transfer reactions were studied at Au electrodes in both acidic and alkaline media. Results of competitive adsorption studies are interpreted and support the conclusion that adsorption is a prerequisite to subsequent oxygen‐ and electron‐transfer steps. Many of these oxidation reactions gave the voltammetric appearance of reversible waves, even though the observed half‐wave potential values were shifted hundreds of millivolts positive of the thermodynamic potentials. A catalytic mechanism is proposed in which adsorbed hydroxyl radicals (AuOH) participate in the oxygen‐transfer step. The absence of pH effects on half‐wave potentials for several inorganic compounds suggests that the electron transfer precedes the deprotonation step for these reactants. Copyright © 1990 VCH Publishers, Inc.
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页码:21 / 30
页数:10
相关论文
共 21 条
[1]  
ADZIC RR, 1986, J CATAL, V101, P532
[2]   ROLE OF ION ADSORPTION IN SURFACE OXIDE FORMATION AND REDUCTION AT NOBLE-METALS - GENERAL FEATURES OF THE SURFACE PROCESS [J].
ANGERSTEINKOZLOWSKA, H ;
CONWAY, BE ;
BARNETT, B ;
MOZOTA, J .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1979, 100 (1-2) :417-446
[3]   ELEMENTARY STEPS OF ELECTROCHEMICAL OXIDATION OF SINGLE-CRYSTAL PLANES OF AU .1. CHEMICAL BASIS OF PROCESSES INVOLVING GEOMETRY OF ANIONS AND THE ELECTRODE SURFACES [J].
ANGERSTEINKOZLOWSKA, H ;
CONWAY, BE ;
HAMELIN, A ;
STOICOVICIU, L .
ELECTROCHIMICA ACTA, 1986, 31 (08) :1051-1061
[4]   ELEMENTARY STEPS OF ELECTROCHEMICAL OXIDATION OF SINGLE-CRYSTAL PLANES OF AU .2. A CHEMICAL AND STRUCTURAL BASIS OF OXIDATION OF THE (111) PLANE [J].
ANGERSTEINKOZLOWSKA, H ;
CONWAY, BE ;
HAMELIN, A ;
STOICOVICIU, L .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1987, 228 (1-2) :429-453
[5]  
Bagotzky V.S., 1964, ELECTROCHIM ACTA, V9, P869
[6]   MECHANISM OF ELECTRO-OXIDATION OF METHANOL ON PLATINUM ELECTRODE [J].
BAGOTZKY, VS ;
VASSILYEW, YB .
ELECTROCHIMICA ACTA, 1967, 12 (09) :1323-+
[7]   ELECTROCATALYTIC OXIDATION OF SATURATED OXYGENATED COMPOUNDS ON GOLD ELECTRODES [J].
BEDEN, B ;
CETIN, I ;
KAHYAOGLU, A ;
TAKKY, D ;
LAMY, C .
JOURNAL OF CATALYSIS, 1987, 104 (01) :37-46
[8]   AN INSITU WEIGHING STUDY OF THE MECHANISM FOR THE FORMATION OF THE ADSORBED OXYGEN MONOLAYER AT A GOLD ELECTRODE [J].
BRUCKENSTEIN, S ;
SHAY, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1985, 188 (1-2) :131-136
[9]   ELECTROCATALYTIC OXIDATION OF AS(III) .2. KINETIC-STUDIES AT PT ELECTRODES [J].
CABELKA, TD ;
AUSTIN, DS ;
JOHNSON, DC .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1985, 132 (02) :359-366
[10]   ELECTROCATALYTIC OXIDATION OF AS(III) .1. VOLTAMMETRIC STUDIES AT PT ELECTRODES IN 0.5M HCIO4 [J].
CABELKA, TD ;
AUSTIN, DS ;
JOHNSON, DC .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1984, 131 (07) :1595-1602