Investigation of the oxygen evolution reaction on Ti/IrO2 electrodes using isotope labelling and on-line mass spectrometry |
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| Institution: | 1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Science and Engineering, CH-1015 Lausanne, Switzerland;2. Institut für Physikalische und Theoretische Chemie, University of Bonn, Bonn, Germany;1. School of Chemical and Biological Engineering, Institute of Chemical Processes (ICP), Seoul National University, Daehak-dong, Gwanak-gu, Seoul 151-742, Republic of Korea;2. World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Institute of Chemical Processes (ICP), Seoul National University, Daehak-dong, Gwanak-gu, Seoul 151-742, Republic of Korea;1. Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA;2. Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA;3. Department of Chemistry, Rice University, Houston, TX 77005, USA;1. Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058, Erlangen, Germany;2. Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany;1. Instituto Politécnico Nacional-ESIQIE, Laboratorio Electroquímica y Corrosión, UPALM, CP 07738 México D.F., Mexico;2. Artie Mc. Ferrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA;1. Physik-Department ECS, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany;2. Catalysis Research Center TUM, Ernst-Otto-Fischer-Straße 1, 85748 Garching, Germany |
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| Abstract: | Oxygen evolution on Ti/IrO2 anodes has been studied in 1M HClO4 electrolyte using 18O labelling together with differential electrochemical mass spectrometry (DEMS) measurements.It has been shown that during successive cyclic voltammetric measurements in H2 18O containing electrolyte the amount of 16O2 (m/z = 32) decreases, with a concomitant increase of 18O16O (m/z = 34) after each cycle before reaching a steady state after four cycles. The obtained higher 16O2 concentration in the evolved oxygen during the first scans is because 16O from the IrO2 film contribute in the oxygen evolution reaction.Analysis of the experimental data has shown that the amount of lattice oxygen, which is involved in the oxygen exchange reaction, is in the order of 1% of the total IrO2 loading. This is an indication that only the outer surface of the oxide electrode participates in the oxygen evolution reaction.In a second series of experiments it has been demonstrated that oxygen evolution on Ir16O2 in H218O containing electrolyte result in the formation of Ir18O2.Consequently, we can conclude that the IrO2 layers participate in the oxygen evolution reaction in acid media at least to a several monolayer extend. |
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