Unveiling active sites in FeOOH nanorods@NiOOH nanosheets heterojunction for superior OER and HER electrocatalysis in water splitting.

Autor: Hua S; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Shah SA; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China; Department of Engineering, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, United Kingdom. Electronic address: Sayyarali83@just.edu.cn., Nsang GEO; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Sayyar R; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China; School of Materials Science & Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Ullah B; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Ullah N; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Khan N; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China., Yuan A; School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China. Electronic address: aihua.yuan@just.edu.cn., Bin Mohd Yusoff AR; Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Malaysia., Ullah H; Department of Engineering, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, United Kingdom. Electronic address: hu203@exeter.ac.uk.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2025 Feb; Vol. 679 (Pt A), pp. 487-495. Date of Electronic Publication: 2024 Oct 03.
DOI: 10.1016/j.jcis.2024.09.219
Abstrakt: The development of cost-effective, highly active, and stable electrocatalysts for water splitting to produce green hydrogen is crucial for advancing clean and sustainable energy technologies. Herein, we present an innovative in-situ synthesis of FeOOH nanorods@NiOOH nanosheets on nickel foam (FeOOH@NiOOH/NF) at an unprecedentedly low temperature, resulting in a highly efficient electrocatalyst for overall water splitting. The optimized FeOOH@NiOOH/NF sample, evaluated through time-dependent studies, exhibits exceptional oxygen evolution reaction (OER) performance with a low overpotential of 261 mV at a current density of 20 mA cm -2 , alongside outstanding hydrogen evolution reaction (HER) activity with an overpotential of 150 mV at a current density of 10 mA cm -2 , demonstrating excellent stability in alkaline solution. The water-splitting device featuring FeOOH@NiOOH/NF-2 electrodes achieves a voltage of 1.59 V at a current density of 10 mA cm -2 , rivalling the state-of-the-art RuO 2 /NF||PtC/NF electrode system. Density functional theory (DFT) calculations unveil the efficient functionality of the Fe sites within the FeOOH@NiOOH heterojunction as the active OER catalyst, while the Ni centres are identified as the active HER sites. The enhanced performance of OER and HER is attributed to the tailored electronic structure at the heterojunction, modified magnetic moments of active sites, and increased electron density in the dx 2 -y 2 orbital of Fe. This work provides critical insights into the rational design of advanced electrocatalysts for efficient water splitting.
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.
(Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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