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Effect of composition on the surface and electrocatalytic properties of Ti/IrO x +RhO x electrodes: H2 evolution from acidic solution

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Abstract

IrO x +RhO x mixed oxide layers on a Ti support were prepared by thermal decomposition at 450 °C over the whole composition range. The temperature range 450–600 °C was explored for the composition 30 mol% RhO x . Samples were characterized by means of SEM, XPS, cyclic voltammetry and polarization curves. Their electrocatalytic properties were tested for the H2 evolution reaction. The following experimental parameters were scrutinized: voltammetric charge, Tafel slope, reaction order (H+), electrical resistance of electrocatalysts. The electrocatalytic properties were evaluated at constant potential as a function of temperature as well as of composition. The electrode stability was assessed by comparing CV curves before and after groups of experiments. A reaction mechanism has been proposed. RhO x is more active than IrO x , its effect showing up for compositions >30 mol%.

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Acknowledgements

Laurentiu Popa is grateful to the European Commission for a Marie Curie Fellowship during which this work was carried out. Thanks are due to the European Commission and MIUR (CoFin) for financial support to this work.

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Authors and Affiliations

  1. Department of Physical Chemistry and Electrochemistry, University of Milan, Via Venezian 21, 20133, Milan, Italy

    L. POPA, E. GUERRINI & S. TRASATTI

Authors
  1. L. POPA
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  2. E. GUERRINI
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  3. S. TRASATTI
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Correspondence to S. TRASATTI.

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In honour of Professor G. Kreysa on the occasion of his 60th birthday.

On leave from Institute for Nuclear Research, Pitesti, Romania.

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POPA, L., GUERRINI, E. & TRASATTI, S. Effect of composition on the surface and electrocatalytic properties of Ti/IrO x +RhO x electrodes: H2 evolution from acidic solution. J Appl Electrochem 35, 1213–1223 (2005). https://doi.org/10.1007/s10800-005-9032-8

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