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Title: Exceptionally active iridium evolved from a pseudo-cubic perovskite for oxygen evolution in acid
Authors: Chen, Yubo
Li, Haiyan
Wang, Jingxian
Du, Yonghua
Xi, Shibo
Sun, Yuanmiao
Sherburne, Matthew
Ager, Joel W.
Fisher, Adrian C.
Xu, Jason Zhichuan
Keywords: DRNTU::Engineering::Materials
Catalyst Synthesis
Issue Date: 2019
Source: Chen, Y., Li, H., Wang, J., Du, Y., Xi, S., Sun, Y.,. . . Xu, Z. J. (2019). Exceptionally active iridium evolved from a pseudo-cubic perovskite for oxygen evolution in acid. Nature Communications, 10(1), 572-. doi:10.1038/s41467-019-08532-3
Series/Report no.: Nature Communications
Abstract: Exploring robust catalysts for water oxidation in acidic electrolyte is challenging due to the limited material choice. Iridium (Ir) is the only active element with a high resistance to the acid corrosion during water electrolysis. However, Ir is rare, and its large-scale application could only be possible if the intrinsic activity of Ir could be greatly enhanced. Here, a pseudo-cubic SrCo0.9Ir0.1O3-δ perovskite, containing corner-shared IrO6 octahedrons, is designed. The Ir in the SrCo0.9Ir0.1O3-δ catalyst shows an extremely high intrinsic activity as reflected from its high turnover frequency, which is more than two orders of magnitude higher than that of IrO2. During the electrochemical cycling, a surface reconstruction, with Sr and Co leaching, over SrCo0.9Ir0.1O3-δ occurs. Such reconstructed surface region, likely contains a high amount of structural domains with corner-shared and under-coordinated IrOx octahedrons, is responsible for the observed high activity.
DOI: 10.1038/s41467-019-08532-3
Rights: © 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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