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Cr-doped NiFe sulfides nanoplate array: Highly efficient and robust bifunctional electrocatalyst for the overall water splitting and seawater electrolysis.
Cr-doped NiFe sulfides nanoplate array: Highly efficient and robust bifunctional electrocatalyst for the overall water splitting and seawater electrolysis.
- Source :
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Journal of colloid and interface science [J Colloid Interface Sci] 2025 Feb 15; Vol. 680 (Pt A), pp. 1079-1089. Date of Electronic Publication: 2024 Nov 13. - Publication Year :
- 2025
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Abstract
- To replace precious metals and reduce production costs for large-scale hydrogen production, developing stable, high-performance transition metal electrocatalysts that can be used in a wide range of environments is desirable yet challenging. Herein, a self-supported hybrid catalyst (NiFeCrS <subscript>x</subscript> /NF) with high electrocatalytic activity was designed and constructed using conductive nickel foam as a substrate via manipulation of the cation doping ratio of transition metal compounds. Due to the strong coupling synergy between the metal sulfides NiS <subscript>2</subscript> , Fe <subscript>9</subscript> S <subscript>11</subscript> , and Cr <subscript>2</subscript> S <subscript>3</subscript> , as well as their interaction with the conductive nickel foam (NF), the energy barrier for catalytic reactions is reduced, and the charge transfer rate is enhanced. This significantly improves the hydrogen evolution reaction (HER) performance of NiFeCrS <subscript>x</subscript> /NF, achieving a current density of 10 mA cm <superscript>-2</superscript> with an overpotential of just 66 mV. Furthermore, doping with chromium generates different valence states of Cr during the catalytic process, which can synergize with the high-valent Fe and Ni, promoting the formation of oxygen vacancies and enriching the active sites for the oxygen evolution reaction (OER). Consequently, at a current density of 10 mA cm <superscript>-2</superscript> in 1.0 M KOH, the overpotential for OER is only 223 mV for NiFeCrS <subscript>x</subscript> /NF. Additionally, the in situ grown of self-supporting nanoflower structure on NiFe-LDH not only provides a large catalytic surface area but also facilitates electrolyte penetration during the catalytic process, endowing NiFeCrS <subscript>x</subscript> /NF with high long-term stability. When used as a bifunctional catalyst for overall water splitting, the NiFeCrS <subscript>x</subscript> /NF||NiFeCrS <subscript>x</subscript> /NF electrolyzer requires only 1.29 V to deliver a current density of 10 mA cm <superscript>-2</superscript> . Simultaneously, Cr doping protects the Fe sites by maintaining stable valence states, ensuring high performance and stability of NiFeCrS <subscript>x</subscript> /NF, even when it is utilized for seawater splitting. This strategy offers novel concepts for creating catalysts based on non-precious metals that can be utilized in various application scenarios.<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 :
- 680
- Issue :
- Pt A
- Database :
- MEDLINE
- Journal :
- Journal of colloid and interface science
- Publication Type :
- Academic Journal
- Accession number :
- 39550859
- Full Text :
- https://doi.org/10.1016/j.jcis.2024.11.072