NiFe and NiCo core-shell nanoparticles supported on graphene as efficient catalysts for oxygen evolution reaction

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI:10.1016/j.ijhydene.2025.04.381

Miriam López García , González-Ingelmo María , Oleg Usoltsev , Freddy E. Oropeza , Janis Timoshenko , Beatriz Roldan Cuenya , Ricardo Santamaría , Clara Blanco , Victoria G. Rocha

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Abstract

The development of inexpensive and abundant catalysts for water electrolysis is underway and a wide variety of transition metal-based carbon composites are being explored for the redox reactions involved in the electrochemical cycle of water, being Oxygen Evolution Reaction (OER) the bottleneck of this process. Herein, NiFe and NiCo core-shell nanoparticles supported on graphene 3D aerogels were developed for Oxygen Evolution Reaction. These hybrids were synthesised via freeze-casting method and thermal reduction, enabling an ultra-dispersion of the nanoparticles along the graphene oxide flakes, precise control over the nanoparticle size, and forming an active core-shell structure. The as-processed NiFe and NiCo core-shell nanoparticles consistently maintaining a low metal content of 10 wt% supported on graphene were successfully tested for OER and compared to the current state-of-the-art (NiFe Layered Double Hydroxides), obtaining overpotentials ranging from 400 to 450 mV at 10 mA cm⁻², a Tafel slope of 84.8 mV dec⁻¹ and great stability over 12 h.

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.