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Chromium-rich CrxIr1−xO2 wire-in-tube alloys for boosted water oxidation with long standing electrocatalytic activity

Title
Chromium-rich CrxIr1−xO2 wire-in-tube alloys for boosted water oxidation with long standing electrocatalytic activity
Authors
Jin D.Kang J.Prabhakaran S.Lee Y.Kim M.H.Kim D.H.Lee C.
Ewha Authors
이종목이영미김명화
SCOPUS Author ID
이종목scopus; 이영미scopus; 김명화scopusscopus
Issue Date
2022
Journal Title
Journal of Materials Chemistry A
ISSN
2050-7488JCR Link
Citation
Journal of Materials Chemistry A vol. 10, no. 26, pp. 13803 - 13813
Publisher
Royal Society of Chemistry
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Chromium-iridium oxide (CrxIr1−xO2) alloys with a wire-in-tube morphology were primally prepared as highly efficient electrocatalysts for the oxygen evolution reaction (OER) via a simple electrospinning method. The synthetic processes with an optimized annealing temperature and a rate of calcination process were finely controlled to shape a distinct double-shell nanotube architecture. A low iridium-content oxide alloy (CrxIr1−xO2 with Cr : Ir atomic ratio of 62 : 38) derived from electrospinning and the post-calcination process was the first to reveal the remarkable OER performances in alkaline solution. Moreover, it maintained the performance throughout the long-term chronopotentiometry test at a constant current density of 10 mA cm−2 without any deterioration. In particular, density functional theory (DFT) calculations prove that the Cr-rich catalyst improves the binding of OOH species on the (110) facet of the CrxIr1−xO2 surface and lowers the Gibbs free energy barrier of the OER process with superior electrocatalytic activity based on the mechanistic inspection of the electrochemical processes. © 2022 The Royal Society of Chemistry
DOI
10.1039/d2ta02984g
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자연과학대학 > 화학·나노과학전공 > Journal papers
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