Adlayer Structure of and Electrochemical O2 Reduction on Cobalt Porphine-Modified and Cobalt Octaethylporphyrin-Modified Au(111) in HClO 4

Soichiro Yoshimoto, Junji Inukai, Akinori Tada, Toru Abe, Tatsuki Morimoto, Atsuhiro Osuka, Hiroyuki Furuta, Kingo Itaya

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    82 Citations (Scopus)

    Abstract

    Adlayers of cobalt(II) porphine (CoP) and [2,3,7,8,12,13,17,18-octaethyl-21H,23-H-porphine]cobalt(II) (CoOEP) were formed on Au(111) by immersing the substrate in a benzene solution containing either CoP or CoOEP molecules and investigated in 0.1 M HClO4 by using in situ scanning tunneling microscopy. Highly ordered arrays of CoP were observed on the Au(111)-(1×1) surface under controlled potential conditions. The adlayer of CoOEP molecules was also highly ordered, whereas the Au(111) substrate was found to become reconstructed upon adsorption of CoOEP Both CoP and CoOEP molecules were closely packed on Au(111) On the adlayers of CoP and CoOEP, the electrochemical reduction of O2 was examined in 0.1 M HClO4 saturated with O2. The adlayers of both CoP and CoOEP on Au(111) enhanced the reduction of O2.

    Original languageEnglish
    Pages (from-to)1948-1954
    Number of pages7
    JournalJournal of Physical Chemistry B
    Volume108
    Issue number6
    DOIs
    Publication statusPublished - Feb 12 2004

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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