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Lookup NU author(s): Professor Mohamed MamloukORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 Wiley-VCH GmbH. Future energy loss can be minimized to a greater extent via developing highly active electrocatalysts for alkaline water electrolyzers. Incorporating an innovative design like high entropy oxides, dealloying, structural reconstruction, in situ activation can potentially reduce the energy barriers between practical and theoretical potentials. Here, a Fd-3m spinel group high entropy oxide is developed via a simple solvothermal and calcination approach. The developed (FeCoMnZnMg)3O4 electrocatalyst shows a near equimolar distribution of all the metal elements resulting in higher entropy (ΔS ≈1.61R) and higher surface area. The self-reconstructed spinel high entropy oxide (S-HEO) catalyst exhibited a lower overpotential of 240 mV to reach 10 mA cm−2 and enhanced reaction kinetics (59 mV dec−1). Noticeably, the S-HEO displayed an outstanding durability of 1000 h without any potential loss, significantly outperforming most of the reported OER electrocatalysts. Further, S-HEO is evaluated as the anode catalyst for an anion exchange membrane water electrolyzer (AEMWE) in 1 m, 0.1 m KOH, and DI water at 20 and 60 °C. These results demonstrate that S-HEO is a highly attractive, non-noble class of materials for high active oxygen evolution reaction (OER) electrocatalysts allowing fine-tuning beyond the limits of bi- or trimetallic oxides.
Author(s): Karthikeyan SC, Ramakrishnan S, Prabhakaran S, Subramaniam MR, Mamlouk M, Kim DH, Yoo DJ
Publication type: Article
Publication status: Published
Journal: Small
Year: 2024
Pages: ePub ahead of print
Online publication date: 31/07/2024
Acceptance date: 15/07/2024
Date deposited: 25/09/2024
ISSN (print): 1613-6810
ISSN (electronic): 1613-6829
Publisher: Wiley-VCH GmbH
URL: https://doi.org/10.1002/smll.202402241
DOI: 10.1002/smll.202402241
ePrints DOI: 10.57711/sxg2-4f31
Data Access Statement: The data that support the findings of this study are available in the supplementary material of this article.
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