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Reaction mechanism for oxygen evolution on RuO2, IrO2, and RuO2@IrO2 core-shell nanocatalysts

Open access
Ma, Zhong, Zhang, Yu, Liu, Shizhong, Xu, Wenqian, Wu, Lijun, Hsieh, Yu-Chi, Liu, Ping, Zhu, Yimei, Sasaki, Kotaro, Renner, Julie N., Ayers, Katherine E., Adzic, Radoslav R., Wang, Jia X.·2018·Journal of Electroanalytical Chemistry

Abstract

Abstract Iridium dioxide, IrO2, is second to the most active RuO2 catalyst for the oxygen evolution reaction (OER) in acid, and is used in proton exchange membrane water electrolyzers due to its high durability. To improve the activity of IrO2-based catalysts, we prepared RuO2@IrO2 core-shell nanocatalysts using carbon-supported Ru as the template. At 1.48 V, the OER specific activity of RuO2@IrO2 is threefold that of IrO2. While the activity volcano plots over wide range of materials have been reported, zooming into the top region to clarify the rate limiting steps of most active catalysts is important for further activity enhancement. Here, we verified theory-proposed sequential water dissociation pathway in which the O O bond forms on a single metal site, not via coupling of two adsorbed intermediates, by fitting measured polarization curves using a kinetic equation with the free energies of adsorption and activation as the parameters. Consistent with theoretical calculations, we show that the OER activities of IrO2 and RuO2@IrO2 are limited by the formation of O adsorbed phase, while the OOH formation on the adsorbed O limits the reaction rate on RuO2.

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Crossref · 10.1016/j.jelechem.2017.10.062

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Metadata

Authors
Ma, Z., Zhang, Y., Liu, S., Xu, W., Wu, L., Hsieh, Y.-C., Liu, P., Zhu, Y., Sasaki, K., Renner, J. N., Ayers, K. E., Adzic, R. R., & Wang, J. X.
Venue
Journal of Electroanalytical Chemistry
Publisher
Elsevier BV
Published
2018-06
Volume
819
Pages
296-305
ISSN
1572-6657 (ISSN-L)
OpenAlex
W2765193133
Cited by
247
References
8
FWCI
3.63
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Reaction mechanism for oxygen evolution on RuO2, IrO2, and RuO2@IrO2 core-shell nanocatalysts. https://app.cochat.ai/papers/10.1016/j.jelechem.2017.10.062
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Ma, Z., Zhang, Y., Liu, S., Xu, W., Wu, L., Hsieh, Y.-C., Liu, P., Zhu, Y., Sasaki, K., Renner, J. N., Ayers, K. E., Adzic, R. R., & Wang, J. X. (2018). Reaction mechanism for oxygen evolution on RuO2, IrO2, and RuO2@IrO2 core-shell nanocatalysts. Journal of Electroanalytical Chemistry. https://doi.org/10.1016/j.jelechem.2017.10.062

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.