Se-doping-induced sulfur vacancy engineering of CuCo<sub>2</sub>S<sub>4</sub> nanosheets for enhanced electrocatalytic overall water splitting

Zhang, Bianli; Qian, Xingyue; Xu, Hui; Jiang, Lin; Xia, Jiawei; Chen, Haiqun; He, Guangyu

doi:10.1039/d3nr03609j

Nanoscale

2023

DOI: 10.1039/d3nr03609j

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Se-doping-induced sulfur vacancy engineering of CuCo₂S₄ nanosheets for enhanced electrocatalytic overall water splitting

Bianli Zhang,

Xingyue Qian,

Hui Xu

et al.

Abstract: Se doping and sulfur vacancies improve the intrinsic catalytic activity of CuCo2S3.68Se0.32. The optimized CuCo2S3.68Se0.32 exhibits excellent HER and OER performance in alkaline media and requires 1.52 V at 10 mA cm−2 for overall water splitting.

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Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution

Luo,

Yu,

et al. 2024

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Rational design of heterostructure catalysts through phase engineering strategy plays a critical role in heightening the electrocatalytic performance of catalysts. Herein, a novel amorphous/crystalline (a/c) heterostructure (a‐CoS/Ni3S2) is manufactured by a facile hydrothermal sulfurization method. Strikingly, the interface coupling between amorphous phase (a‐CoS) and crystalline phase (Ni3S2) in a‐CoS/Ni3S2 is much stronger than that between crystalline phase (c‐CoS) and crystalline phase (Ni3S2) in crystalline/crystalline (c/c) heterostructure (c‐CoS/Ni3S2) as control sample, which makes the meta‐stable amorphous structure more stable. Meanwhile, a‐CoS/Ni3S2 has more S vacancies (Sv) than c‐CoS/Ni3S2 because of the presence of an amorphous phase. Eventually, for the oxygen evolution reaction (OER), the a‐CoS/Ni3S2 exhibits a significantly lower overpotential of 192 mV at 10 mA cm−2 compared to the c‐CoS/Ni3S2 (242 mV). An exceptionally low cell voltage of 1.51 V is required to achieve a current density of 50 mA cm−2 for overall water splitting in the assembled cell (a‐CoS/Ni3S2 || Pt/C). Theoretical calculations reveal that more charges transfer from a‐CoS to Ni3S2 in a‐CoS/Ni3S2 than in c‐CoS/Ni3S2, which promotes the enhancement of OER activity. This work will bring into play a fabrication strategy of a/c catalysts and the understanding of the catalytic mechanism of a/c heterostructures.

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Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution

Luo,

Yu,

et al. 2024

Small

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Construction of nickel stannum based sulfide as efficient electrocatalysts for freshwater, seawater and urea oxidation

Zhao,

Liu,

et al. 2024

International Journal of Hydrogen Energy

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Charge-induced high-valence zirconium-doped CuCo2S4/Co(OH)2 nanowires promote bifunctional water splitting

Zhang,

Liu,

Zou

et al. 2025

Journal of Alloys and Compounds

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Se-doping-induced sulfur vacancy engineering of CuCo₂S₄ nanosheets for enhanced electrocatalytic overall water splitting

Abstract: Se doping and sulfur vacancies improve the intrinsic catalytic activity of CuCo2S3.68Se0.32. The optimized CuCo2S3.68Se0.32 exhibits excellent HER and OER performance in alkaline media and requires 1.52 V at 10 mA cm−2 for overall water splitting.

Cited by 4 publications

References 46 publications

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution

Construction of nickel stannum based sulfide as efficient electrocatalysts for freshwater, seawater and urea oxidation

Charge-induced high-valence zirconium-doped CuCo2S4/Co(OH)2 nanowires promote bifunctional water splitting

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Se-doping-induced sulfur vacancy engineering of CuCo2S4 nanosheets for enhanced electrocatalytic overall water splitting

Abstract: Se doping and sulfur vacancies improve the intrinsic catalytic activity of CuCo2S3.68Se0.32. The optimized CuCo2S3.68Se0.32 exhibits excellent HER and OER performance in alkaline media and requires 1.52 V at 10 mA cm−2 for overall water splitting.

Cited by 4 publications

References 46 publications

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni3S2 for Efficient Oxygen Evolution

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni3S2 for Efficient Oxygen Evolution

Construction of nickel stannum based sulfide as efficient electrocatalysts for freshwater, seawater and urea oxidation

Charge-induced high-valence zirconium-doped CuCo2S4/Co(OH)2 nanowires promote bifunctional water splitting

Contact Info

Product

Resources

About

Se-doping-induced sulfur vacancy engineering of CuCo₂S₄ nanosheets for enhanced electrocatalytic overall water splitting

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution

Strong Interface Coupling Enables Stability of Amorphous Meta‐Stable State in CoS/Ni₃S₂ for Efficient Oxygen Evolution