POTENTIAL-DEPENDENT SURFACE SEGREGATION IN LEAD PLUS RUTHENIUM PYROCHLORE PB2RU2O7-Y

被引：21

作者：

GOKAGAC, G ^{[1
]}

KENNEDY, BJ ^{[1
]}

机构：

[1] UNIV SYDNEY,DEPT INORGAN CHEM,SYDNEY,NSW 2006,AUSTRALIA

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1993年 / 353卷 / 1-2期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1016/0022-0728(93)80287-R

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The effect of anodic polarization on the surface composition of Pb + Ru pyrochlore Pb2Ru2O7-y in acid and acid+alcohol solutions has been studied using cyclic voltammetry, scanning electron microscopy, energy dispersive analysis and X-ray photoelectron spectroscopy. In acidic solutions the surface is observed to be unstable to oxygen evolution even at reasonably low overpotentials. Lead is found to diffuse from the pyrochlore matrix resulting in the formation of small crystallites of PbO2 on the surface of a mixed Pb + Ru oxide substrate. RuO2 does not appear to form on the surface.

引用

页码：71 / 80

页数：10

共 17 条

[1]

ASBURY DA, 1988, SURF SCI, V552, P199

[2] HYDROGEN EVOLUTION ON IRIDIUM OXIDE CATHODES [J].

BOODTS, JCF ;

TRASATTI, S .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1989, 19 (02) :255-262

[3] CYCLIC VOLTAMMETRY AS A TECHNIQUE FOR DETERMINING THE SURFACE-AREA OF RUO2 ELECTRODES [J].

BURKE, LD ;

MURPHY, OJ .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1979, 96 (01) :19-27

[4] THE ELECTRONIC-STRUCTURE OF BI2-XGDXRU2O7 AND RUO2 - A STUDY BY ELECTRON-SPECTROSCOPY [J].

COX, PA ;

GOODENOUGH, JB ;

TAVENER, PJ ;

TELLES, D ;

EGDELL, RG .

JOURNAL OF SOLID STATE CHEMISTRY, 1986, 62 (03) :360-370

[5]

DILLON CT, IN PRESS AUST J CHEM

[6]

EDGELL RG, 1983, J CHEM SOC F1, V79, P893

[7] EXPANDED LATTICE RUTHENIUM PYROCHLORE OXIDE CATALYSTS .2. CATALYST SURFACE INVESTIGATIONS BY ELECTRON-MICROSCOPY, X-RAY PHOTOELECTRON-SPECTROSCOPY, AND TEMPERATURE-PROGRAMMED REDUCTION AND OXIDATION [J].

FELTHOUSE, TR ;

FRAUNDORF, PB ;

FRIEDMAN, RM ;

SCHOSSER, CL .

JOURNAL OF CATALYSIS, 1991, 127 (01) :421-444

[8] SURFACE PROTONATION AND ELECTROCHEMICAL ACTIVITY OF OXIDES IN AQUEOUS-SOLUTION [J].

GOODENOUGH, JB ;

MANOHARAN, R ;

PARANTHAMAN, M .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1990, 112 (06) :2076-2082

[9] BAND-STRUCTURE OF METALLIC PYROCHLORE RUTHENATES BI2RU2O7 AND PB2RU2O6.5 [J].

HSU, WY ;

KASOWSKI, RV ;

MILLER, T ;

CHIANG, TC .

APPLIED PHYSICS LETTERS, 1988, 52 (10) :792-794

[10] PB2M207-X(M=RU,IR,RE) - PREPARATION AND PROPERTIES OF OXYGEN DEFICIENT PYROCHLORES [J].

LONGO, JM ;

RACCAH, PM ;

GOODENOU.JB .

MATERIALS RESEARCH BULLETIN, 1969, 4 (03) :191-&

← 1 2 →