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The formation of unsaturated IrO_x in SrIrO₃ by cobalt-doping for acidic oxygen evolution reaction.

ABSTRACT: Electrocatalytic water splitting is a promising route for sustainable hydrogen production. However, the high overpotential of the anodic oxygen evolution reaction poses significant challenge. SrIrO₃-based perovskite-type catalysts have shown great potential for acidic oxygen evolution reaction, but the origins of their high activity are still unclear. Herein, we develop a Co-doped SrIrO₃ system to enhance oxygen evolution reaction activity and elucidate the origin of catalytic activity. In situ experiments reveal Co activates surface lattice oxygen, rapidly exposing IrO_x active sites, while bulk Co doping optimizes the adsorbate binding energy of IrO_x. The Co-doped SrIrO₃ demonstrates high oxygen evolution reaction electrocatalytic activity, markedly surpassing the commercial IrO₂ catalysts in both conventional electrolyzer and proton exchange membrane water electrolyzer.

SUBMITTER: Zhao JW

PROVIDER: S-EPMC10995174 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature

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The formation of unsaturated IrOx in SrIrO3 by cobalt-doping for acidic oxygen evolution reaction.

Zhao Jia-Wei JW Yue Kaihang K Zhang Hong H Wei Shu-Yin SY Zhu Jiawei J Wang Dongdong D Chen Junze J Fominski Vyacheslav Yu VY Li Gao-Ren GR

Nature communications 20240404 1

Electrocatalytic water splitting is a promising route for sustainable hydrogen production. However, the high overpotential of the anodic oxygen evolution reaction poses significant challenge. SrIrO3-based perovskite-type catalysts have shown great potential for acidic oxygen evolution reaction, but the origins of their high activity are still unclear. Herein, we develop a Co-doped SrIrO3 system to enhance oxygen evolution reaction activity and elucidate the origin of cataly ...[more]

PMID: 38575606

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Project description:There are many challenges associated with the fabrication of efficient, inexpensive, durable and very stable nonprecious metal catalysts for the hydrogen evolution reaction (HER). In this study, we have designed a facile strategy by tailoring the concentration of precursors to successfully obtain nickel-cobalt bimetallic sulfide (NiCo2S4) using a simple hydrothermal method. The morphology of the newly prepared NiCo2S4 comprised a mixture of microparticles and nanorods, which were few microns in dimension. The crystallinity of the composite sample was found to be excellent with a cubic phase. The sample that contained a higher amount of cobalt compared to nickel and produced single-phase NiCo2S4 exhibited considerably improved HER performance. The variation in the salt precursor concentration during the synthesis of a material is a simple methodology to produce a scalable platinum-free catalyst for HER. The advantageous features of the multiple active sites of cobalt in the CN-21 sample as compared to that for pristine CoS and NiS laid the foundation for the provision of abundant active edges for HER. The composite sample produced a current density of 10 mA cm-2 at an overpotential of 345 mV. Also, it exhibited a Tafel value of 60 mV dec-1, which predominantly ensured rapid charge transfer kinetics during HER. CN-21 was highly durable and stable for 30 hours. Electrochemical impedance spectroscopy showed that the charge transfer resistance was 21.88 ohms, which further validated the HER polarization curves and Tafel results. CN-21 exhibited a double layer capacitance of 4.69 μF cm-2 and a significant electrochemically active surface area of 134.0 cm2, which again supported the robust efficiency for HER. The obtained results reveal that our developed NiCo2S4 catalyst has a high density of active edges, and it is a non-noble metal catalyst for the hydrogen evolution reaction. The present findings provide an alternative strategy and an active nonprecious material for the development of energy-related applications.

Dataset Information

The formation of unsaturated IrO_x in SrIrO₃ by cobalt-doping for acidic oxygen evolution reaction.

Publications

The formation of unsaturated IrO<sub>x</sub> in SrIrO<sub>3</sub> by cobalt-doping for acidic oxygen evolution reaction.

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