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https://hdl.handle.net/2440/118360
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Type: | Journal article |
Title: | Charge-redistribution-enhanced nanocrystalline Ru@IrOx electrocatalysts for oxygen evolution in acidic media |
Author: | Shan, J. Guo, C. Zhu, Y. Chen, S. Song, L. Jaroniec, M. Zheng, Y. Qiao, S.Z. |
Citation: | Chem, 2019; 5(2):445-459 |
Publisher: | Cell Press; Elsevier |
Issue Date: | 2019 |
ISSN: | 2451-9308 2451-9294 |
Statement of Responsibility: | Jieqiong Shan, Chunxian Guo, Yihan Zhu, Shuangming Chen, Li Song, Mietek Jaroniec, Yao Zheng, Shi-Zhang Qiao |
Abstract: | Achieving high activity and long-term stability is a major challenge in the design of catalysts. In particular, the oxygen evolution reaction (OER) in acidic media, which plays a key role in proton exchange membrane electrolyzers for fast hydrogen fuel generation, seriously suffers from rapid degradation of catalysts as a result of the harsh acidic and oxidative conditions. Here, we report a rational design strategy for the fabrication of a heterostructured OER electrocatalyst (Ru@IrOx) that has unique physicochemical properties and in which a strong charge redistribution exists between a highly strained ruthenium core and a partially oxidized iridium shell across the metal-metal oxide heterojunction. The increased valence of the iridium shell and the decreased valence of the ruthenium core activate a synergistic electronic and structural interaction, which results in the enhanced activity and stability of the catalyst compared with the majority of the state-of-the-art ruthenium- and iridium-based materials. |
Keywords: | Oxygen evolution reaction; acidic media; core-shell nanocrystal; ruthenium-iridium alloy; charge redistribution; activity; stability |
Rights: | © 2018 Elsevier Inc. |
DOI: | 10.1016/j.chempr.2018.11.010 |
Grant ID: | http://purl.org/au-research/grants/arc/FL170100154 http://purl.org/au-research/grants/arc/DP160104866 http://purl.org/au-research/grants/arc/DP170104464 http://purl.org/au-research/grants/arc/DE160101163 http://purl.org/au-research/grants/arc/DE160101293 |
Published version: | http://dx.doi.org/10.1016/j.chempr.2018.11.010 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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