RuO2-TiO2 mixed oxides prepared from the hydrolysis of the metal alkoxides

被引：25

作者：

Osman, Julian R. ^{[1
]}

Crayston, Joe A. ^{[1
]}

Pratt, Allin ^{[2
]}

Richens, David T. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Chem, EaStCHEM, St Andrews KY16 9ST, Fife, Scotland

[2] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2008年 / 110卷 / 2-3期

关键词：

sol-gel processing; ruthenium oxide; titanium oxide;

D O I：

10.1016/j.matchemphys.2008.02.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The hydrolysis of ruthenium alkoxide/titanium tetraethoxide mixtures to gels and powders containing 30-40 mol% Ru was investigated. Basic or neutral conditions led to powders consisting of 2-10 nm diameter crystalline RuO2 nanoparticles embedded in a matrix of crystalline (anatase) and amorphous TiO2. Acid hydrolysis conditions gave gels containing smaller, amorphous RuO2 nanoparticles (1-3 nm). In all samples the RuO2 nanoparticles tended to clump into aggregates up to 0.5 mu m across. Acid or neutral hydrolysis of ruthenium ethoxide gave samples which displayed lower surface Ru:Ti ratios as measured by XPS compared to the bulk (XRF), and also contained more low-valent Ru (as measured by XRF), probably due to incomplete hydrolysis of the precursors. These samples also contained more Ru metal after calcination (XRD). Calcination (450 degrees C) was accompanied by Ru-promoted combustion of organic material and led to crystalline (anatase) TiO2 and TixRu1-xO2 solid solution (rutile phase). (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：256 / 262

页数：7

共 51 条

[1] Thin and thick RuO2-TiO2 coatings on titanium substrates by the sol-gel process [J].

Aparicio, M ;

Klein, LC .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2004, 29 (02) :81-88

[2] Analysis of the electrochemical characteristics of a direct methanol fuel cell based on a Pt-Ru/C anode catalyst [J].

Arico, AS ;

Creti, P ;

Kim, H ;

Mantegna, R ;

Giordano, N ;

Antonucci, V .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (12) :3950-3959

[3] A molecular approach to RuO2-based thin films:: sol-gel synthesis and characterisation [J].

Armelao, L ;

Barreca, D ;

Moraru, B .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2003, 316 (2-3) :364-371

[4]

BRINKER CJ, 1990, SOL GEOL SCI PHYS CH

[5] Hydrothermal synthesis of binary Ru-Ti oxides with excellent performances for supercapacitors [J].

Chang, Kuo-Hsin ;

Hu, Chi-Chang .

ELECTROCHIMICA ACTA, 2006, 52 (04) :1749-1757

[6] Kinetics of the hydrogen evolution reaction on RuO2 and IrO2 oxide electrodes in H2SO4 solution: An AC impedance study [J].

Chen, LL ;

Guay, D ;

Lasia, A .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (11) :3576-3584

[7] Rutile-type dense ceramics fabricated by pressureless sintering of Ti1-xRuxO2 powders prepared by sol-gel [J].

Colomer, M. T. ;

Velasco, M. J. .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2007, 27 (06) :2369-2376

[8] Synthesis and thermal evolution of TiO2-RuO2 xerogels [J].

Colomer, M. T. ;

Velasco, M. J. ;

Jurado, J. R. .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2006, 39 (03) :211-222

[9]

CRAYSTON JA, 2004, COMPREHENSIVE COORDI, V1, P711

[10] CHARACTERIZATION OF RUO2-BASED FILM ELECTRODES BY SECONDARY-ION MASS-SPECTROMETRY [J].

DAOLIO, S ;

FACCHIN, B ;

PAGURA, C ;

DEBATTISTI, A ;

BARBIERI, A ;

KRISTOF, J .

JOURNAL OF MATERIALS CHEMISTRY, 1994, 4 (08) :1255-1258

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