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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.
Citation: Chem, 2019; 5(2):445-459
Publisher: Cell Press; Elsevier
Issue Date: 2019
ISSN: 2451-9308
Statement of
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.
RMID: 0030108978
DOI: 10.1016/j.chempr.2018.11.010
Grant ID:
Appears in Collections:Chemical Engineering publications

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