Effect of potential cycling on structure and activity of Pt nanoparticles dispersed on different carbon supports

被引:63
作者
Grolleau, C. [1 ]
Coutanceau, C. [1 ]
Pierre, F. [2 ]
Leger, J-M [1 ]
机构
[1] Univ Poitiers, Catalyse Chim Organ Lab, Equipe Eectrocatalyse, UMR CNRS 6503, F-86000 Poitiers, France
[2] ST Microelect Tours, F-37100 Tours, France
关键词
active surface area; carbon oxidation; nitric acid treatment; oxygen reduction reaction; PEMFC; potential cycling; TEM;
D O I
10.1016/j.electacta.2008.05.014
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Platinum particles synthesized via the Bonnemann methods were dispersed on two different Vulcan XC72 carbon Supports. One was used after thermal treatment at 400 degrees C under nitrogen atmosphere, the other after oxidation of its Surface by acid leaching using diluted HNO3 in water (1/3). Characterization of the carbon support indicated that HNO3 treatment leads to the decrease of the BET surface and to the increase of the surface acidity of the carbon support. After dispersion of the platinum catalyst, TEM results indicated that the mean particle size was a little higher on the non-oxidized support (Pt/XC72) than that on the functionalized one (Pt/XC72(HNO3)), being 2.5 and 2.0 nm, respectively. However, potential cycles from 0.05 to 1.25 V vs. RHE led to a higher increase of the particle size when catalyst is dispersed on the functionalized support, reaching after 400 potential cycles 5.5 nm against 4.0 nm with the non-functionalized one. The effect of the upper limit (1.0 and 1.25 V vs. RHE) of the potential cycles on the active surface area and on the activity towards the oxygen reduction reaction (orr) was determined for both catalysts. Results indicated that the particle growth was not the main degradation process over the whole duration of the electrochemical experiments, but that dissolution/redeposition (Otswald ripening) was also involved. The predominant role of each degradation process depends on the number of cycles, on the upper potential limit and on the carbon surface state, and could be temporally separated. However, the lower activity towards orr was recorded for the (Pt/XC72(HNO3)) cycled Lip to 1.0 V vs. RHE. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:7157 / 7165
页数:9
相关论文
共 47 条
  • [1] Performance and degradation of high temperature polymer electrolyte fuel cell catalysts
    Arico, A. S.
    Stassi, A.
    Modica, E.
    Ornelas, R.
    Gatto, I.
    Passalacqua, E.
    Antonucci, V.
    [J]. JOURNAL OF POWER SOURCES, 2008, 178 (02) : 525 - 536
  • [2] THEORIES OF NORMAL GRAIN-GROWTH IN PURE SINGLE-PHASE SYSTEMS
    ATKINSON, HV
    [J]. ACTA METALLURGICA, 1988, 36 (03): : 469 - 491
  • [3] Bard A.J., 2001, Electrochemical Methods: Fundamental and Applications, V2nd, P340
  • [4] SOME ASPECTS OF THE SURFACE-CHEMISTRY OF CARBON-BLACKS AND OTHER CARBONS
    BOEHM, HP
    [J]. CARBON, 1994, 32 (05) : 759 - 769
  • [5] Surface oxides on carbon and their analysis: a critical assessment
    Boehm, HP
    [J]. CARBON, 2002, 40 (02) : 145 - 149
  • [6] PREPARATION, CHARACTERIZATION, AND APPLICATION OF FINE METAL PARTICLES AND METAL COLLOIDS USING HYDROTRIORGANOBORATES
    BONNEMANN, H
    BRIJOUX, W
    BRINKMANN, R
    FRETZEN, R
    JOUSSEN, T
    KOPPLER, R
    KORALL, B
    NEITELER, P
    RICHTER, J
    [J]. JOURNAL OF MOLECULAR CATALYSIS, 1994, 86 (1-3): : 129 - 177
  • [7] FORMATION OF COLLOIDAL TRANSITION-METALS IN ORGANIC PHASES AND THEIR APPLICATION IN CATALYSIS
    BONNEMANN, H
    BRIJOUX, W
    BRINKMANN, R
    DINJUS, E
    JOUSSEN, T
    KORALL, B
    [J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1991, 30 (10): : 1312 - 1314
  • [8] PEM fuel cell electrocatalyst durability measurements
    Borup, Rod L.
    Davey, John R.
    Garzon, Fernando H.
    Wood, David L.
    Inbody, Michael A.
    [J]. JOURNAL OF POWER SOURCES, 2006, 163 (01) : 76 - 81
  • [9] Influence of surfactant removal by chemical or thermal methods on structure and electroactivity of Pt/C catalysts prepared by water-in-oil microemulsion
    Brimaud, S.
    Coutanceau, C.
    Garnier, E.
    Leger, J.-M.
    Gerard, F.
    Pronier, S.
    Leoni, M.
    [J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2007, 602 (02) : 226 - 236
  • [10] Interaction between core and protection shell of N(butyl)4Cl- and N(octyl)4Cl-stabilized Pd colloids
    Bucher, S
    Hormes, J
    Modrow, H
    Brinkmann, R
    Waldöfner, N
    Bönnemann, H
    Beuermann, L
    Krischok, S
    Maus-Friedrichs, W
    Kempter, V
    [J]. SURFACE SCIENCE, 2002, 497 (1-3) : 321 - 332