XPS and reactivity study of bimetallic nanoparticles containing Ru and Pt supported on a gold disk

被引：67

作者：

Lewera, A.

Zhou, W. P.

Vericat, C.

Chung, J. H.

Haasch, R.

Wieckowski, A.

Bagus, P. S.

机构：

[1] Univ Illinois, Dept Chem, Urbana, IL 61801 USA

[2] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

[3] Univ N Texas, Dept Chem, Denton, TX 76203 USA

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 19期

关键词：

bimetallic; catalysis; electrochemistry; XPS; Pt; Ru; methanol;

D O I：

10.1016/j.electacta.2005.11.009

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We report a new method of immobilization of catalytic metal/alloy nanoparticles on a gold disk for transfer from an electrochemical cell to UHV (without sample exposure to air) for XPS analyses. Using this immobilization approach, several samples were examined: a core-shell Pt-on-Ru catalyst prepared from Ru black onto which Pt was spontaneously deposited, commercial Pt/Ru 50:50 nanoparticle alloy, as well as single metal Ru and Pt nanoparticle samples. The catalysts were characterized for the Ru oxidation state and for the methanol electrooxidation activity (as Pt was always metallic). For all bimetallic samples, we found that the reduced nanoparticles were more active towards methanol oxidation than the fully or partially oxidized samples. Regardless the Ru oxidation state however, the activity was lower than that previously reported for Ru decorated Pt nanoparticle catalysts (Ru-on-Pt). Possible reasons for the reactivity differences are discussed. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：3950 / 3956

页数：7

共 50 条

[1] Electronic alterations caused by ruthenium in Pt-Ru alloy nanoparticles as revealed by electrochemical NMR [J].

Babu, PK ;

Kim, HS ;

Oldfield, E ;

Wieckowski, A .

JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (31) :7595-7600

[2] Electrosorption and catalytic properties of bare and Pt modified single crystal and nanostructured Ru surfaces [J].

Brankovic, SR ;

Wang, JX ;

Zhu, Y ;

Sabatini, R ;

McBreen, J ;

Adzic, RR .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2002, 524 :231-241

[3]

Carrette L, 2001, FUEL CELLS, V1, P5, DOI 10.1002/1615-6854(200105)1:1<5::AID-FUCE5>3.0.CO

[4]

2-G

[5] High-pressure oxidation of ruthenium as probed by surface-enhanced Raman and X-ray photoelectron spectroscopies [J].

Chan, HYH ;

Takoudis, CC ;

Weaver, MJ .

JOURNAL OF CATALYSIS, 1997, 172 (02) :336-345

[6] Enhancement in methanol oxidation by spontaneously deposited ruthenium on low-index platinum electrodes [J].

Chrzanowski, W ;

Kim, H ;

Wieckowski, A .

CATALYSIS LETTERS, 1998, 50 (1-2) :69-75

[7] 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

[8]

Crown A, 2000, J NEW MAT ELECTR SYS, V3, P275

[9] Electrocatalysis in direct methanol fuel cells: in-situ probing of PtRu anode catalyst surfaces [J].

Dinh, HN ;

Ren, XM ;

Garzon, FH ;

Zelenay, P ;

Gottesfeld, S .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2000, 491 (1-2) :222-233

[10] ELECTROOXIDATION OF SMALL ORGANIC-MOLECULES ON WELL-CHARACTERIZED PT-RU ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

ELECTROCHIMICA ACTA, 1994, 39 (11-12) :1825-1832

← 1 2 3 4 5 →