Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Hou, Yuxi; Quan, Weiwei; Lin, Yingbin; Hong, Zhensheng; Yang, Rui; Yao, Hu‐Rong; Huang, Yiyin

doi:10.1016/j.electacta.2023.142844

Electrochimica Acta

2023

DOI: 10.1016/j.electacta.2023.142844

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Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Yuxi Hou

Weiwei Quan

Yingbin Lin

et al.

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Cited by 4 publications

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Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

Hou,

Hong,

Lin

et al. 2024

Adv Funct Materials

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Controlling the electronic structure based on the valence state is key for effective electrocatalysis, and the challenge lies in attaining the optimal metal valence states. Here, a new approach called valence‐elastic control is introduced to create intermediate‐valence Ru species within a‐RuOx/C catalyst matrices. By utilizing hetero‐interfaces between RuOx and C, pathways for efficient electron transfer and precise valence adjustment are activated through switchable bonding at the interfaces. The catalyst demonstrates exceptional performance in hydrogen evolution reaction with an unprecedentedly low overpotential of 4.1 mV in KOH + seawater electrolytes at 10 mA cm−2. Furthermore, the two‐electrode electrolyzer demonstrates improved stability and voltage efficiency compared to the commercial Pt/C‐based system. The in situ tests combined with theoretical analysis reveal the water dissociation and *H adsorption are optimized by the switchable interface bonding of the tailored Ru species. This study showcases a transformative design framework for next‐generation high‐efficiency metal catalysts with variable valence.

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Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

Hou,

Hong,

Lin

et al. 2024

Adv Funct Materials

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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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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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Ruthenium-cobalt nano-oxide coupler with enhanced water dissociation for oxidation

Quan,

Hou,

Luo

et al. 2024

Applied Catalysis A: General

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Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Cited by 4 publications

References 50 publications

Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

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

Ruthenium-cobalt nano-oxide coupler with enhanced water dissociation for oxidation

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Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Cited by 4 publications

References 50 publications

Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

Interface Switchable Bonding Tailored Ruthenium Sites Unveil Ultralow Overpotentials for Hydrogen Evolution

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

Ruthenium-cobalt nano-oxide coupler with enhanced water dissociation for oxidation

Contact Info

Product

Resources

About

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