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Iridium oxide-based nanocrystalline particles as oxygen evolution electrocatalysts

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Abstract

Iridium-based oxides are highly active as oxygen evolving electrocatalysts in PEM water electrolyzers. In this work XRD reveals that Ir-Sn oxides contain a single rutile phase with lattice parameters between those of pure IrO2 and SnO2. Addition of Ru leads to the synthesis of a core-shell type material due to the strong agglomeration of Ru colloids during the preparation procedure. The shell of this material consists of an Ir-Sn-Ru oxide deficient in Ru relative to the bulk. This leads to a decrease in the surface noble metal concentration (as found by XPS), which in turn results in a significant reduction in electrochemically active surface area. Polarization analysis indicates that the addition of Ru can influence the rate-determining step or mechanism by which oxygen is evolved. In a PEM water electrolysis cell, small additions of Sn do not significantly reduce the operating performance, however larger additions cause a performance loss due to a reduction in active surface area and increased ohmic resistance. When a pure IrO2 anode is used, a cell voltage is 1.61 V at 1 A cm−2 and 90°C.

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Authors and Affiliations

  1. Norwegian University of Science and Technology, Russia

    A. Marshall, B. Børresen, G. Hagen, S. Sunde, M. Tsypkin & R. Tunold

Authors
  1. A. Marshall
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  2. B. Børresen
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  3. G. Hagen
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  4. S. Sunde
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  5. M. Tsypkin
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  6. R. Tunold
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Corresponding author

Correspondence to R. Tunold.

Additional information

Published in Russian in Elektrokhimiya, 2006, Vol. 42, No. 10, pp. 1260–1267.

The text was submitted by the authors in English.

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Marshall, A., Børresen, B., Hagen, G. et al. Iridium oxide-based nanocrystalline particles as oxygen evolution electrocatalysts. Russ J Electrochem 42, 1134–1140 (2006). https://doi.org/10.1134/S1023193506100223

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  • DOI: https://doi.org/10.1134/S1023193506100223

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