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Synthesis and Oxygen Electrocatalysis of Iridium Oxide Nanosheets

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Abstract

Rutile-type iridium dioxide (IrO2) is a well-known electrocatalyst, and its nanoparticle form has recently attracted attention as catalysts and co-catalysts in electrolyzers and fuel cells. In this study, we have successfully synthesized single crystalline iridium dioxide (IrO2) nanosheets with thickness of less than 0.7 nm via exfoliation of layered iridic acid H x Ir y O z ·nH2O, which was prepared via proton exchange of layered potassium iridate, K x Ir y O z ·nH2O. The electrochemically active surface area of the IrO2 nanosheet electrode was similar to or slightly lower than that of 3-nm IrO2 nanoparticles. Despite the lower active surface area, the mass activity for oxygen evolution reaction of IrO2 nanosheets was six times higher compared to that of IrO2 nanoparticles in 0.1 M HClO4 at 1.55 V vs. the reversible hydrogen electrode (17.4 vs. 2.9 A g−1). When IrO2 nanosheets were added to commercial Pt/C as a co-catalyst, increased stability against high potential cycling was obtained. After potential cycling between 1.0 and 1.5 V, the composite catalyst exhibited two times higher oxygen reduction activity compared to non-modified Pt/C. This durability enhancement is attributed to the suppression of the particle growth during the potential cycling test by the modification with IrO2 nanosheets.

IrO2 nanosheets are highly active as electrocatalysts for O2 evolution and O2 reduction

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Acknowledgements

This work was supported in part by the Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST). D.T. acknowledges the support from the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for JSPS Fellows Grant Number 16J09715.

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Authors and Affiliations

  1. Interdisciplinary Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan

    Daisuke Takimoto, Dai Mochizuki & Wataru Sugimoto

  2. Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan

    Katsutoshi Fukuda

  3. Division of Chemistry and Materials, Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan

    Shu Miyasaka, Takanobu Ishida, Dai Mochizuki & Wataru Sugimoto

  4. Materials and Chemical Engineering, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan

    Yusuke Ayato, Dai Mochizuki, Wataru Shimizu & Wataru Sugimoto

  5. Center for Energy and Environmental of Science, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan

    Yusuke Ayato, Dai Mochizuki & Wataru Sugimoto

Authors
  1. Daisuke Takimoto
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  2. Katsutoshi Fukuda
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  3. Shu Miyasaka
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  4. Takanobu Ishida
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  5. Yusuke Ayato
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  7. Wataru Shimizu
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  8. Wataru Sugimoto
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Correspondence to Wataru Sugimoto.

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Takimoto, D., Fukuda, K., Miyasaka, S. et al. Synthesis and Oxygen Electrocatalysis of Iridium Oxide Nanosheets. Electrocatalysis 8, 144–150 (2017). https://doi.org/10.1007/s12678-016-0348-4

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  • DOI: https://doi.org/10.1007/s12678-016-0348-4

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