Catalysis of ethanol electro oxidation by PtRu: the influence of catalyst composition

被引：161

作者：

Camara, GA ^{[1
]}

de Lima, RB ^{[1
]}

Iwasita, T ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2004年 / 6卷 / 08期

基金：

巴西圣保罗研究基金会;

关键词：

electrocatalysis; ethanol electrooxidation; FTIR; fuel cell; PtRu electrodeposits;

D O I：

10.1016/j.elecom.2004.06.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The catalytic activity for ethanol oxidation is studied as a function of the atomic composition of PtRu electrodeposits. Chronoamperometric curves taken at 0.5 V show that the current for ethanol oxidation at PtRu electrodeposits, measured 30 min after the application of a potential step from 0.05 V, increases in the presence of Ru up to a Ru content of about 40%. The highest value observed at 0.5 V vs. RHE was 30 muA/cm(2) at 25 degreesC. There is a relatively narrow range of PtRu compositions that present a high rate of ethanol oxidation. Pure Ru has no activity towards ethanol oxidation at room temperature. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：812 / 815

页数：4

共 16 条

[1]

CAMARA GA, UNPUB

[2] METAL CRYSTALLINITY EFFECTS IN ELECTROCATALYSIS AS PROBED BY REAL-TIME FTIR SPECTROSCOPY - ELECTROOXIDATION OF FORMIC-ACID, METHANOL, AND ETHANOL ON ORDERED LOW-INDEX PLATINUM SURFACES [J].

CHANG, SC ;

LEUNG, LWH ;

WEAVER, MJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (15) :6013-6021

[3] Electro-oxidation of ethanol on Pt, Rh, and PtRh electrodes. A study using DEMS and in-situ FTIR techniques [J].

de Souza, JPI ;

Queiroz, SL ;

Bergamaski, K ;

Gonzalez, ER ;

Nart, FC .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (38) :9825-9830

[4] Enhancement of the electrooxidation of ethanol on a Pt-PEM electrode modified by tin.: Part I:: Half cell study [J].

Delime, F ;

Léger, JM ;

Lamy, C .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1999, 29 (11) :1249-1254

[5] TEMPERATURE-DEPENDENT METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RU ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (07) :1795-1803

[6] A DEMS AND FTIR SPECTROSCOPIC INVESTIGATION OF ADSORBED ETHANOL ON POLYCRYSTALLINE PLATINUM [J].

IWASITA, T ;

PASTOR, E .

ELECTROCHIMICA ACTA, 1994, 39 (04) :531-537

[7] Electrocatalysis of methanol oxidation [J].

Iwasita, T .

ELECTROCHIMICA ACTA, 2002, 47 (22-23) :3663-3674

[8] Fuel cells: Spectroscopic studies in the electrocatalysis of alcohol oxidation [J].

Iwasita, T .

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY, 2002, 13 (04) :401-409

[9] Methanol oxidation on PtRu electrodes. Influence of surface structure and Pt-Ru atom distribution [J].

Iwasita, T ;

Hoster, H ;

John-Anacker, A ;

Lin, WF ;

Vielstich, W .

LANGMUIR, 2000, 16 (02) :522-529

[10] Chemical state of ruthenium submonolayers on a Pt(111) electrode [J].

Kim, H ;

de Moraes, IR ;

Tremiliosi-Filho, G ;

Haasch, R ;

Wieckowski, A .

SURFACE SCIENCE, 2001, 474 (1-3) :L203-L212

← 1 2 →