Bulk CO oxidation on platinum electrodes vicinal to the Pt(111) surface

被引:15
|
作者
Angelucci, Camilo A. [2 ]
Herrero, Enrique [1 ]
Feliu, Juan M. [1 ]
机构
[1] Univ Alicante, Inst Electroquim, E-03080 Alicante, Spain
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
关键词
D O I
10.1007/s10008-007-0348-7
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Bulk CO oxidation has been studied on platinum stepped surfaces belonging to the series Pt(S)[n(111)x(111)], using a hanging meniscus rotating disk electrode (HMRDE) configuration. The general shape of the voltammograms is not significantly affected by the presence of the steps. However, the curves shift towards negative values as the step density increases. Thus, in the positive-going scan, a linear relationship is observed for the dependence of the potential for the ignition peak vs the step density for surfaces with terraces wider than five atoms, shorter terraces deviate from this behavior. In the negative-going scan, a similar situation is observed for the potential where the current drops to zero. In this case, Pt(111) electrode also deviates from the expected behavior because of the formation of the ordered bisulfate adlayer on the electrode. The anion readsorption process is also observed by recording the HRMDE voltammograms at a high scan rate. All these results have been analyzed in light of a common mechanism, discussing the possible role of the steps in the stability and reactivity of the CO adlayer.
引用
收藏
页码:1531 / 1539
页数:9
相关论文
共 50 条
  • [21] CO adsorption and oxidation on Pt(111) electrodes modified by irreversibly adsorbed selenium and tellurium
    Herrero, E
    Rodes, A
    Perez, JM
    Feliu, JM
    Aldaz, A
    JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1996, 412 (1-2): : 165 - 174
  • [22] Electrocatalytic activity of Ru-modified Pt(111) electrodes toward CO oxidation
    Lin, WF
    Zei, MS
    Eiswirth, M
    Ertl, G
    Iwasita, T
    Vielstich, W
    JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (33): : 6968 - 6977
  • [23] Electrocatalysis of formic acid and CO oxidation on antimony-modified Pt(111) electrodes
    Climent, V
    Herrero, E
    Feliu, JM
    ELECTROCHIMICA ACTA, 1998, 44 (8-9) : 1403 - 1414
  • [24] CONTRASTING SURFACE BEHAVIOR OF RH (111) AND PT (111) ELECTRODES
    HOURANI, M
    WASBERG, M
    RHEE, C
    WIECKOWSKI, A
    CROATICA CHEMICA ACTA, 1990, 63 (03) : 373 - 399
  • [25] Role of dissolved CO in the solution on the origin of CO pre-oxidation on Pt (111)-Type electrodes
    Farias, Manuel J. S.
    Lima, Benedicto A., V
    Tremiliosi-Filho, Germano
    Herrero, Enrique
    JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2021, 896
  • [26] FTIR studies of tyrosine oxidation at polycrystalline Pt and Pt(111) electrodes
    Zinola, CF
    Rodríguez, JL
    Arévalo, MC
    Pastor, E
    JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2005, 585 (02) : 230 - 239
  • [27] Time-domain investigation of laser-induced diffusion of CO on a vicinal Pt(111) surface
    Lawrenz, M.
    Stepan, K.
    Guedde, J.
    Hoefer, U.
    PHYSICAL REVIEW B, 2009, 80 (07):
  • [28] The co-catalytic effect of Sn, Ru and Mo decorating steps of Pt(111) vicinal electrode surfaces on the oxidation of CO
    Massong, H
    Wang, HS
    Samjeské, G
    Baltruschat, H
    ELECTROCHIMICA ACTA, 2000, 46 (05) : 701 - 707
  • [29] Surface stress observations during the adsorption and electrochemical oxidation of CO on Pt{111}
    Mickelson, L.
    Heaton, Th.
    Friesen, C.
    JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (04): : 1060 - 1063
  • [30] Understanding CO oxidation on the Pt(111) surface based on a reaction route network
    Sugiyama, Kanami
    Sumiya, Yosuke
    Takagi, Makito
    Saita, Kenichiro
    Maeda, Satoshi
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2019, 21 (26) : 14366 - 14375