Electrooxidation of small organic molecules on mesoporous precious metal catalysts II: CO and methanol on platinum-ruthenium alloy

被引：185

作者：

Jiang, JH ^{[1
]}

Kucernak, A ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2003年 / 543卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

electrocatalysis; mesoporous; methanol; carbon monoxide; fuel cell;

D O I：

10.1016/S0022-0728(03)00046-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mesoporous Pt-Ru alloy has been successively prepared by the chemical co-reduction of hexachloroplatinic acid and ruthenium trichloride both dissolved in aqueous domains of the liquid crystalline phases of an oligoethylene oxide surfactant using Zn metal reductant. The resultant material containing mesoporous structures has a high specific electrochemical surface area and has been examined as an electrocatalyst towards the electrooxidation of CO and methanol using cyclic voltammetry and chronoamperometry. The rate of electrooxidation of adsorbed CO on the mesoporous Pt-Ru electrode can be modelled by the nucleation and growth of CO free holes under a process that involves 2D nucleation and 2D surface diffusion-controlled growth. Methanol is oxidized mainly via a direct pathway to soluble products on the mesoporous Pt-Ru electrode and steady-state kinetics can be attained even at low potentials. The electrocatalytic activity of the mesoporous PtRu towards methanol oxidation is favourable compared to an ultrafine Pt-Ru electrocatalyst with similar bulk composition. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：187 / 199

页数：13

共 66 条

[61] Reactivity and activation parameters in methanol oxidation on platinum single crystal electrodes 'decorated' by ruthenium adlayers [J].

Tremiliosi-Filho, G ;

Kim, H ;

Chrzanowski, W ;

Wieckowski, A ;

Grzybowska, B ;

Kulesza, P .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1999, 467 (1-2) :143-156

[62] Kinetic and mechanistic study of methanol oxidation on a Pt(111) surface in alkaline media [J].

Tripkovic, AV ;

Popovic, KD ;

Momcilovic, JD ;

Drazic, DM .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1996, 418 (1-2) :9-20

[63] Two-dimensional nucleation according to an exponential law with surface diffusion-controlled growth in the phase formation of uracil on Au(hkl) [J].

Wandlowski, T ;

Dretschkow, T .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 427 (1-2) :105-112

[64] PHASE-TRANSITIONS IN URACIL ADLAYERS ON AG, AU AND HG ELECTRODES - SUBSTRATE EFFECTS [J].

WANDLOWSKI, T .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1995, 395 (1-2) :83-89

[65] HIGH PLATINUM ELECTROCATALYST UTILIZATIONS FOR DIRECT METHANOL OXIDATION [J].

WATANABE, M ;

SAEGUSA, S ;

STONEHART, P .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1989, 271 (1-2) :213-220

[66] Electrodeposition of mesoporous tin films [J].

Whitehead, AH ;

Elliott, JM ;

Owen, JR ;

Attard, GS .

CHEMICAL COMMUNICATIONS, 1999, (04) :331-332

← 1 2 3 4 5 6 7 →