Methanol oxidation on Pt/Ru, Pt/Ni, and Pt/Ru/Ni anode electrocatalysts at different temperatures for DMFCs

被引：142

作者：

Choi, JH ^{[1
]}

Park, KW ^{[1
]}

Kwon, BK ^{[1
]}

Sung, YE ^{[1
]}

机构：

[1] Kwangju Inst Sci & Technol, Dept Mat Sci & Engn, Gwangju 500712, South Korea

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2003年 / 150卷 / 07期

关键词：

D O I：

10.1149/1.1581011

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pt/Ru (1:1), Pt/Ni (1:1), and Pt/Ru/Ni (5:4:1) electrocatalysts for use in direct methanol fuel cells (DMFCs) were synthesized by reduction with NaBH4 combined with freeze-drying and their activity as a methanol oxidation catalyst was examined at different temperatures. The onset potential of Pt/Ru/Ni (5:4:1) was lower than that of Pt/Ru (1:1) and current density of Pt/Ru/Ni (5:4:1) was larger than that of Pt/Ru (1:1). In addition, Pt/Ru/Ni (5:4:1) had a larger turnover number and a smaller activation energy for methanol oxidation than Pt/Ru (1:1). Polarization and power density data in a liquid-feed DMFC unit cell test were in good agreement with the voltammetry and chronoamperometry data, for which Pt/Ru/Ni (5:4:1) showed a higher catalytic activity than Pt/Ru (1:1). The role of Ni from the standpoint of the oxidation states of Ni and the modification of the electronic structure of Pt by X-ray photoelectron spectroscopy is discussed. (C) 2003 The Electrochemical Society.

引用

页码：A973 / A978

页数：6

共 34 条

[1] ELECTROOXIDATION OF METHANOL ON PLATINUM BONDED TO THE SOLID POLYMER ELECTROLYTE, NAFION
ARAMATA, A
KODERA, T
MASUDA, M
[J]. JOURNAL OF APPLIED ELECTROCHEMISTRY, 1988, 18 (04) : 577 - 582
[2] BINDER H, 1972, ELECTROCATALYS FUEL, P53
[3] CAMERON DS, 1992, ELECTROCHEMICAL SOC, V9214, P10
[4] Surface structure effects in platinum/ruthenium methanol oxidation electrocatalysis
Chrzanowski, W
Wieckowski, A
[J]. LANGMUIR, 1998, 14 (08) : 1967 - 1970
[5] Enhancement in methanol oxidation by spontaneously deposited ruthenium on low-index platinum electrodes
Chrzanowski, W
Kim, H
Wieckowski, A
[J]. CATALYSIS LETTERS, 1998, 50 (1-2) : 69 - 75
[6] Methanol electro-oxidation on unsupported Pt-Ru alloys at different temperatures
Chu, D
Gilman, S
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (05) : 1685 - 1690
[7] ENTINA VS, 1968, ELEKTROKHIMIYA, V4, P678
[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] Binary and ternary anode catalyst formulations including the elements W, Sn and Mo for PEMFCs operated on methanol or reformate gas
Gotz, M
Wendt, H
[J]. ELECTROCHIMICA ACTA, 1998, 43 (24) : 3637 - 3644
[10] Structural and electrochemical characterization of binary, ternary, and quaternary platinum alloy catalysts for methanol electro-oxidation
Gurau, B
Viswanathan, R
Liu, RX
Lafrenz, TJ
Ley, KL
Smotkin, ES
Reddington, E
Sapienza, A
Chan, BC
Mallouk, TE
Sarangapani, S
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (49): : 9997 - 10003

← 1 2 3 4 →