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Facile synthesis of Ir-based high-entropy alloy nanomaterials for efficient oxygen evolution electrocatalysis.

Authors :
Hao X
Qi Y
Ding S
Ma S
Xu B
Zhang B
Cao Q
Zhao P
Source :
Journal of colloid and interface science [J Colloid Interface Sci] 2024 Dec 19; Vol. 683 (Pt 1), pp. 1096-1105. Date of Electronic Publication: 2024 Dec 19.
Publication Year :
2024
Publisher :
Ahead of Print

Abstract

High-entropy alloy (HEA) nanomaterials have emerged as promising candidates as oxygen evolution reaction (OER) electrocatalyst to overcome the existing issues of the sluggish reaction kinetics and poor stability. In this study, Ir <subscript>x</subscript> RuCoCuNi HEA three-dimensional-nanoframeworks (3DNF) are prepared using a scalable approach-the spray-drying technique combined with thermal decomposition reduction (SD-TDR). The optimized catalyst, Ir <subscript>2</subscript> RuCoCuNi, demonstrates superior OER performance, with an overpotential of 264 mV at 10 mA cm <superscript>-2</superscript> and a Tafel slope of 47 mV dec <superscript>-1</superscript> , considerably surpassing the catalytic activity of commercial IrO <subscript>2</subscript> . Electrochemical data reveal high electron transfer efficiency and a significant electrochemically active surface area (ECSA), attributed to its 3DNF porous structure and favorable surface self-reconstruction into (oxy)hydroxides during the OER. While increasing Ir content enhances catalytic activity, economic analysis highlights compositions with reduced Ir content, such as IrRu <subscript>2</subscript> CoCuNi and IrRuCo <subscript>2</subscript> CuNi, as cost-effective alternatives for practical applications. These findings underscore the potential of HEA 3DNFs for industrial-scale electrocatalysis and provide insights into balancing performance and cost for next-generation OER catalysts.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1095-7103
Volume :
683
Issue :
Pt 1
Database :
MEDLINE
Journal :
Journal of colloid and interface science
Publication Type :
Academic Journal
Accession number :
39721081
Full Text :
https://doi.org/10.1016/j.jcis.2024.12.147