Мақола

Iron vacancy engineering accelerates alkaline oxygen evolution on nickel–iron layered double hydroxide

Суннатулло ГаффоровDepartment of Dentistry, Children Density and Orthodontics, Center for the Development Professional Qualifications of Medical Workers, Parkent Street, 100007 Tashkent, UzbekistanDilafruz MakhkamovaDepartment of Soil Science, National University of Uzbekistan named after M. Ulugbek, 100174 Tashkent, UzbekistanJasur RizaevDepartment of Public Health and Healthcare Management, Rector of Samarkand State Medical University, Samarkand, UzbekistanSagatov Miraziz VorisovichDepartment of Information Technologies, Faculty of Electronics and Automation, Tashkent State Technical University named after Islam Karimov, Tashkent, UzbekistanJahongir QosimovDepartment Engineering graphics and design theory, Tashkent Institute of Irrigation and Agricultural Mechanization Engineers, National Research University, Tashkent, UzbekistanOzimbay JabbarovDepartment of Faculty and Hospital Therapy, Nephrology and Hemodialysis, Tashkent State Medical University, Tashkent, UzbekistanNafizakhon YulchievaDepartment of Chemistry of Natural Compounds and Food Products, Andijan State University, Andijan, Uzbekistan

Electrochemistry Communicationsjournal2026en

ABI

Аннотация

Nickel–iron layered double hydroxide (NiFe-LDH) nanosheets represent one of the most active non-noble-metal electrocatalysts for the oxygen evolution reaction (OER) in alkaline media, yet the intrinsic catalytic activity of these nanosheets remains constrained by a scarcity of accessible active sites and inadequate charge-transfer kinetics. Selective iron vacancy induction in pre-synthesised NiFe-LDH nanosheets proceeded through a controlled sodium borohydride etching protocol, yielding a defect-enriched architecture designated Fe-vac-NiFe-LDH. Structural and spectroscopic characterisation confirms that partial removal of Fe 3+ ions from the brucite-type layers creates coordinatively unsaturated nickel sites, elevates the Ni 3+ /Ni 2+ ratio from 0.33 to 0.48, and expands the Brunauer–Emmett–Teller surface area from 62.4 to 98.7 m 2 g −1 . Electrochemical measurements in 1.0 M KOH demonstrate that Fe-vac-NiFe-LDH attains an overpotential of 218 mV at 10 mA cm −2 , a Tafel slope of 42 mV dec −1 , and a charge-transfer resistance of 2.1 Ω, outperforming both the pristine analogue (280 mV, 68 mV dec −1 , 8.4 Ω) and commercial RuO₂ (305 mV, 74 mV dec −1 , 15.6 Ω). The electrochemically active surface area rises 2.6-fold relative to the pristine material, directly attributable to the vacancy-induced exposure of active sites. Chronoamperometric measurements at 10 mA cm −2 confirm 97.8% current retention over 24 h.

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Мавзулар

Layered Double Hydroxides Synthesis and Applications Electrocatalysts for Energy Conversion Advanced Photocatalysis Techniques

Идентификаторлар

DOI: 10.1016/j.elecom.2026.108211

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