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Consistent scheme for computing standard hydrogen electrode and redox potentials

Authors

  • Toru Matsui,

    Corresponding author
    1. Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
    2. Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
    • Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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  • Yasutaka Kitagawa,

    1. Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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  • Mitsutaka Okumura,

    1. Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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  • Yasuteru Shigeta,

    1. Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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  • Shigeyoshi Sakaki

    Corresponding author
    1. Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
    • Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
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Abstract

The standard hydrogen electrode (SHE) potential in aqueous solution was evaluated with new computational procedure that provides the Gibbs energy of a proton in aqueous solution from the experimental pKa value and the Gibbs energy change by deprotonation reactions of several neutral alcohol molecules. With our computational scheme, the CCSD(T)/aug-cc-pVDZ method provides the SHE potential of 4.52 V, which is almost the same as the experimental SHE potential. This scheme also reproduces well the redox potentials of several typical reactions within almost 0.1 V. B3LYP also gives excellent redox potentials of the same reactions with almost the same accuracy with our new computational scheme. © 2012 Wiley Periodicals, Inc.

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