Kinetically controlled synthesis of Co3O4 nanoparticles on Ni(OH)2 nanosheet arrays for efficient oxygen evolution reaction

Hongfang Du; Qing Chen; Long Cheng; Zhuzhu Du; Boxin Li; Tingfeng Wang; Ke Wang; Song He; Wei Ai

doi:10.1016/j.ces.2024.120094

Kinetically controlled synthesis of Co₃O₄ nanoparticles on Ni(OH)₂ nanosheet arrays for efficient oxygen evolution reaction

Hongfang Du, Qing Chen, Long Cheng, Zhuzhu Du, Boxin Li, Tingfeng Wang, Ke Wang, Song He, Wei Ai

Institute of Flexible Electronics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Co₃O₄ is a promising electrocatalyst for oxygen evolution reaction (OER), yet its controllable synthesis has been challenging. Herein, a versatile approach is developed to fabricate Co₃O₄ nanoparticles (NPs) on diverse supports through the hydrothermal treatment of Co(NH₃)₆³⁺ with an ammonia mediator. The ammonia is critical as it determines the dissociation kinetics of Co(NH₃)₆³⁺, which in turn affects the nucleation and growth processes for kinetically controlling the size and dispersion of Co₃O₄ NPs. The Co₃O₄ NPs grown on 3D architectured Ni(OH)₂ nanosheet arrays (Co₃O₄@Ni(OH)₂) are applied as the catalysts for OER. Promoting by electron migration from Ni(OH)₂ to Co₃O₄ to improve the intrinsic activity and the structural merits, the optimal Co₃O₄@Ni(OH)₂ exhibits excellent OER performance, showing a competitive η₁₀₀ of 399 mV and a small Tafel slope of 60 mV dec⁻¹. This research presents a simple and efficient ammonia-mediated strategy to controllably synthesize Co₃O₄ on various supports for OER and beyond.

Original language	English
Article number	120094
Journal	Chemical Engineering Science
Volume	293
DOIs	https://doi.org/10.1016/j.ces.2024.120094
State	Published - 5 Jul 2024

Keywords

CoO
Cobalt ammonia complex
Controllable synthesis
Ni(OH)
Oxygen evolution reaction

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title = "Kinetically controlled synthesis of Co3O4 nanoparticles on Ni(OH)2 nanosheet arrays for efficient oxygen evolution reaction",

abstract = "Co3O4 is a promising electrocatalyst for oxygen evolution reaction (OER), yet its controllable synthesis has been challenging. Herein, a versatile approach is developed to fabricate Co3O4 nanoparticles (NPs) on diverse supports through the hydrothermal treatment of Co(NH3)63+ with an ammonia mediator. The ammonia is critical as it determines the dissociation kinetics of Co(NH3)63+, which in turn affects the nucleation and growth processes for kinetically controlling the size and dispersion of Co3O4 NPs. The Co3O4 NPs grown on 3D architectured Ni(OH)2 nanosheet arrays (Co3O4@Ni(OH)2) are applied as the catalysts for OER. Promoting by electron migration from Ni(OH)2 to Co3O4 to improve the intrinsic activity and the structural merits, the optimal Co3O4@Ni(OH)2 exhibits excellent OER performance, showing a competitive η100 of 399 mV and a small Tafel slope of 60 mV dec−1. This research presents a simple and efficient ammonia-mediated strategy to controllably synthesize Co3O4 on various supports for OER and beyond.",

keywords = "CoO, Cobalt ammonia complex, Controllable synthesis, Ni(OH), Oxygen evolution reaction",

author = "Hongfang Du and Qing Chen and Long Cheng and Zhuzhu Du and Boxin Li and Tingfeng Wang and Ke Wang and Song He and Wei Ai",

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doi = "10.1016/j.ces.2024.120094",

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AU - Du, Hongfang

AU - Chen, Qing

AU - Cheng, Long

AU - Du, Zhuzhu

AU - Li, Boxin

AU - Wang, Tingfeng

AU - Wang, Ke

AU - He, Song

AU - Ai, Wei

PY - 2024/7/5

Y1 - 2024/7/5

N2 - Co3O4 is a promising electrocatalyst for oxygen evolution reaction (OER), yet its controllable synthesis has been challenging. Herein, a versatile approach is developed to fabricate Co3O4 nanoparticles (NPs) on diverse supports through the hydrothermal treatment of Co(NH3)63+ with an ammonia mediator. The ammonia is critical as it determines the dissociation kinetics of Co(NH3)63+, which in turn affects the nucleation and growth processes for kinetically controlling the size and dispersion of Co3O4 NPs. The Co3O4 NPs grown on 3D architectured Ni(OH)2 nanosheet arrays (Co3O4@Ni(OH)2) are applied as the catalysts for OER. Promoting by electron migration from Ni(OH)2 to Co3O4 to improve the intrinsic activity and the structural merits, the optimal Co3O4@Ni(OH)2 exhibits excellent OER performance, showing a competitive η100 of 399 mV and a small Tafel slope of 60 mV dec−1. This research presents a simple and efficient ammonia-mediated strategy to controllably synthesize Co3O4 on various supports for OER and beyond.

AB - Co3O4 is a promising electrocatalyst for oxygen evolution reaction (OER), yet its controllable synthesis has been challenging. Herein, a versatile approach is developed to fabricate Co3O4 nanoparticles (NPs) on diverse supports through the hydrothermal treatment of Co(NH3)63+ with an ammonia mediator. The ammonia is critical as it determines the dissociation kinetics of Co(NH3)63+, which in turn affects the nucleation and growth processes for kinetically controlling the size and dispersion of Co3O4 NPs. The Co3O4 NPs grown on 3D architectured Ni(OH)2 nanosheet arrays (Co3O4@Ni(OH)2) are applied as the catalysts for OER. Promoting by electron migration from Ni(OH)2 to Co3O4 to improve the intrinsic activity and the structural merits, the optimal Co3O4@Ni(OH)2 exhibits excellent OER performance, showing a competitive η100 of 399 mV and a small Tafel slope of 60 mV dec−1. This research presents a simple and efficient ammonia-mediated strategy to controllably synthesize Co3O4 on various supports for OER and beyond.

KW - CoO

KW - Cobalt ammonia complex

KW - Controllable synthesis

KW - Ni(OH)

KW - Oxygen evolution reaction

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DO - 10.1016/j.ces.2024.120094

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Kinetically controlled synthesis of Co₃O₄ nanoparticles on Ni(OH)₂ nanosheet arrays for efficient oxygen evolution reaction

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