Evaluation of the nafion effect on the activity of Pt-Ru electrocatalysts for the electro-oxidation of methanol

被引：52

作者：

Chu, YH

Shul, YG

Choi, WC

Woo, SI

Han, HS

机构：

[1] Yonsei Univ, Dept Chem Engn, Seodaemun Ku, Seoul 120749, South Korea

[2] Korea Adv Inst Sci & Technol, Ctr Ultramicrochem Proc Syst, Dept Chem Engn, Taejon 305701, South Korea

来源：

JOURNAL OF POWER SOURCES | 2003年 / 118卷 / 1-2期

关键词：

methanol electro-oxidation; electrochemistry; direct methanol fuel cell; platinum-ruthenium; nation ionomer; CO poisoning;

D O I：

10.1016/S0378-7753(03)00082-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of the Nafion ionomer as a proton conductor on the platinum-ruthenium (Pt-Ru) alloy electrocatalyst for the electro-oxidation of methanol was investigated using combinatorial electrochemical methods. The most active composition of the Pt-Ru alloy electrocatalysts for the electro-oxidation of methanol was Pt(54.5)Ru(45.5), and the most active composition of the Pt-Ru-Nafion electrocatalysts for the electro-oxidation of methanol was metal (Pt:Ru = 1: 1, molar ratio):Nafion = 63.6:36.4, wt.%. The electrochemical properties of the electrodes were compared using cyclic voltammetry, impedance spectroscopy and a performance test of a direct methanol fuel cell (DMFC). When the Nation was added to the Pt-Ru alloy electrocatalyst, the initial activation potential decreased about 80 mV versus RHE, and the methanol electro-oxidation activity simultaneously increased. In a CO poisoning experiment, the CO was desorbed at a lower potential (lower than 130 mV versus RHE) when the Nafion was present. These results suggest a synergistic effect of Nafion-active metal catalysts for the electro-oxidation of methanol. (C) 2003 Published by Elsevier Science B.V.

引用

页码：334 / 341

页数：8

共 24 条

[1] Influence of Nafion loading in the catalyst layer of gas-diffusion electrodes for PEFC
Antolini, E
Giorgi, L
Pozio, A
Passalacqua, E
[J]. JOURNAL OF POWER SOURCES, 1999, 77 (02) : 136 - 142
[2] Investigation of direct methanol fuel cells based on unsupported Pt-Ru anode catalysts with different chemical properties
Aricò, AS
Cretì, P
Modica, E
Monforte, G
Baglio, V
Antonucci, V
[J]. ELECTROCHIMICA ACTA, 2000, 45 (25-26) : 4319 - 4328
[3] Status of the development of a direct methanol fuel cell
Baldauf, M
Preidel, W
[J]. JOURNAL OF POWER SOURCES, 1999, 84 (02) : 161 - 166
[4] Aspects of the anodic oxidation of methanol
Burstein, GT
Barnett, CJ
Kucernak, AR
Williams, KR
[J]. CATALYSIS TODAY, 1997, 38 (04) : 425 - 437
[5] Combinatorial discovery of bifunctional oxygen reduction - water oxidation electrocatalysts for regenerative fuel cells
Chen, GY
Delafuente, DA
Sarangapani, S
Mallouk, TE
[J]. CATALYSIS TODAY, 2001, 67 (04) : 341 - 355
[6] Quaternary Pt-based electrocatalyst for methanol oxidation by combinatorial electrochemistry
Choi, WC
Kim, JD
Woo, SI
[J]. CATALYSIS TODAY, 2002, 74 (3-4) : 235 - 240
[7] METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RN ALLOYS
GASTEIGER, HA
MARKOVIC, N
ROSS, PN
CAIRNS, EJ
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (46) : 12020 - 12029
[8] TEMPERATURE-DEPENDENT METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RU ALLOYS
GASTEIGER, HA
MARKOVIC, N
ROSS, PN
CAIRNS, EJ
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (07) : 1795 - 1803
[9] Mechanism and electrocatalysis in the direct methanol fuel cell
Hamnett, A
[J]. CATALYSIS TODAY, 1997, 38 (04) : 445 - 457
[10] MULTIPLE-SAMPLE-CONCEPT IN MATERIALS RESEARCH - SYNTHESIS, COMPOSITIONAL ANALYSIS AND TESTING OF ENTIRE MULTICOMPONENT SYSTEMS
HANAK, JJ
[J]. JOURNAL OF MATERIALS SCIENCE, 1970, 5 (11) : 964 - &

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