A heterogeneous reaction strategy towards the general synthesis of 2D non-layered nanomaterials

Qin, Wenjing; Liu, Hao; Liu, Jiahui; Yuan, Jiangbo; Wei, Cong; Xu, Qun

doi:10.1039/d2ma00412g

Mater. Adv.

2022

DOI: 10.1039/d2ma00412g

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A heterogeneous reaction strategy towards the general synthesis of 2D non-layered nanomaterials

Wenjing Qin,

Hao Liu,

Jiahui Liu

et al.

Abstract: 2D non-layered materials have exhibited various exotic physical and chemical features that distinctly different from their layered counterparts, but a general synthesis approach is still lacking for their intrinsic isotropic...

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Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Chen,

Xu,

et al. 2024

Advanced Science

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The inefficiency of electrocatalysts for water splitting in neutral media stems from a comprehensive impact of poor intrinsic activity, a limited number of active sites, and inadequate mass transport. Herein, hierarchical ultrathin NiCo2Se4 nanosheets are synthesized by the selenization of NiCo2O4 porous nanoneedles. Theoretical and experimental investigations reveal that the intrinsic hydrogen evolution reaction (HER) activity primarily originate from the NiCo2Se4, whereas the high oxygen evolution reaction (OER) performance is related to the NiCoOOH due to the structural reconstruction. The abundant Se and O vacancies introduced by atomically thin nanostructure modulate the electronic structure of NiCo2Se4 and NiCoOOH, thereby improving the intrinsic HER and OER activities, respectively. COMSOL simulation demonstrate the edges of extended nanosheets from the main body significantly promote the charge aggregation, boosting the reduction and oxidation current during HER/OER process. This charge aggregation effect notably exceeds the tip effect for the nanoneedle, highlighting the unique advantage of the hierarchical nanosheet structure. Benefiting from abundant vacancies and unique nanostructure, the hierarchical ultrathin nanosheet simultaneously improve the thermodynamics and kinetics of the electrocatalyst. The optimized samples display an overpotential of 92 mV for HER and 214 mV for OER at 100 mA cm−2, significantly surpassing the performance of currently reported HER/OER catalysts in neutral media.

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Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Chen,

Xu,

et al. 2024

Advanced Science

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Dual-mode arrayed vibration-wind piezoelectric energy harvester

Xu,

Long,

Tian

et al. 2025

Energy Conversion and Management

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A heterogeneous reaction strategy towards the general synthesis of 2D non-layered nanomaterials

Abstract: 2D non-layered materials have exhibited various exotic physical and chemical features that distinctly different from their layered counterparts, but a general synthesis approach is still lacking for their intrinsic isotropic...

Cited by 2 publications

References 48 publications

Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Dual-mode arrayed vibration-wind piezoelectric energy harvester

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A heterogeneous reaction strategy towards the general synthesis of 2D non-layered nanomaterials

Abstract: 2D non-layered materials have exhibited various exotic physical and chemical features that distinctly different from their layered counterparts, but a general synthesis approach is still lacking for their intrinsic isotropic...

Cited by 2 publications

References 48 publications

Hierarchical NiCo2Se4 Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Hierarchical NiCo2Se4 Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Dual-mode arrayed vibration-wind piezoelectric energy harvester

Contact Info

Product

Resources

About

Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media

Hierarchical NiCo₂Se₄ Arrays Composed of Atomically Thin Nanosheets: Simultaneous Improvements in Thermodynamics and Kinetics for Electrocatalytic Water Splitting in Neutral Media