Cover Picture: Role of Water in the Chlorine Evolution Reaction at RuO2-Based Electrodes—Understanding Electrocatalysis as a Resonance Phenomenon (ChemSusChem 10/2012)

Authors

  • Aleksandar R. Zeradjanin,

    1. Analytische Chemie—Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
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  • Nadine Menzel,

    1. The Electrochemical Energy, Catalysis and Material Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin (Germany)
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  • Prof. Dr. Peter Strasser,

    1. The Electrochemical Energy, Catalysis and Material Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin (Germany)
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  • Prof. Dr. Wolfgang Schuhmann

    Corresponding author
    1. Analytische Chemie—Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
    2. Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
    • Analytische Chemie—Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
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Abstract

original image

The cover image shows how the reaction path of the Cl2 evolution reaction (CER) is investigated by combining electrochemical and spectroscopic methods, as reported by Schuhmann et al. on page 1897. Oxidation and reconstruction of the catalyst surface during CER is a consequence of the interaction between RuO2 and water. The solvent is crucial in the formation of an oxygen-containing hydrophilic layer, which is a key prerequisite for electrocatalytic Cl2 formation. New insights in the general understanding of electrocatalysis are obtained utilizing the vibration frequencies of the crystal lattice as a dynamic catalytic descriptor, instead of thermodynamic descriptors such as the adsorption energy of intermediates. Interpretation of the derived “volcano”-curve suggests that electrocatalysis is governed by a resonance phenomenon.

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