N-induced compressive strain in Ni-MoO2 heterostructure with micro-nano array for improving high-current-output urea-assisted water electrolysis performance

Qian, Guangfu; Lu, Tian; Wang, Yunpeng; Xu, Haotian; Cao, Xinyu; Xie, Zehan; Chen, Changzhou; Min, Douyong

doi:10.1016/j.cej.2023.147993

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2023.147993

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N-induced compressive strain in Ni-MoO2 heterostructure with micro-nano array for improving high-current-output urea-assisted water electrolysis performance

Guangfu Qian,

Tian Lu,

Yunpeng Wang

et al.

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Cited by 9 publications

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Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Qian,

Wang,

et al. 2024

Adv Funct Materials

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Developing high‐activity non‐noble metal catalysts for improving the ability of water dissociation and H* adsorption/desorption in the hydrogen evolution reaction (HER) process in alkaline and neutral electrolytes is essential but remains challenging. Herein, a Mo‐doped NiCoCu alloy with tuned tensile strain and localized electrons is designed and synthesized by combining the solvothermal and annealing methods for achieving ampere‐level HER performance. Theoretical calculation results prove that Mo doping induces lattice tensile strain and localized electrons (electrons from Mo to the Ni/Co/Cu atoms), promoting the adsorption of O* and H* from H2O molecules on the Mo and Co sites and accelerating water dissociation. Therefore, NiCoCu‐Mo0.078/CF (CF = copper foam) shows low water dissociation energy, providing sufficient H* during the HER process. Meanwhile, its H* Gibbs free energy value is near zero, implying a rapid H* adsorption/desorption process. Electrochemical results show that NiCoCu‐Mo0.078/CF achieves better HER intrinsic activity in both a 1.0 m KOH (η−10 /η−1000 = 35/212 mV) and a 1.0 m phosphate buffer solution (η−10 /η−1000 = 24/256 mV) compared to NiCoCu‐Mo0/CF and NiCoCu‐Mo0.163/CF, and it can continuously operate for 100 h at −1000 mA cm−2. This work shows a sustainable way to design high‐performance catalysts for water electrolysis and proposes a well‐performing HER catalyst.

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Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Qian,

Wang,

et al. 2024

Adv Funct Materials

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Superhydrophilicity and Electronic Modulation on Self‐Supported Lignin‐Derived Carbon Coupled with NiO@MoNi₄ for Enhancing Urea Electrolysis

Wang,

Qian,

et al. 2024

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Developing highly efficient biomass‐derived carbon‐based electrocatalysts remains challenging for urea electrolysis because most of these electrocatalysts show powder morphology, which can lead to Ostwald ripening during the reaction process, and its reaction mechanism should be further verified. Herein, self‐supported lignin‐derived carbon coupling NiO@MoNi4 heterojunction (NiO@MoNi4/C) possesses superhydrophilic properties and electronic modulation, boosting the performance of urea electrolysis. Electrochemical results show that an indirect oxidation step for urea oxidation reaction (UOR) and Volmer‐Heyrovsky mechanism for hydrogen evolution reaction (HER) occurs on the surface of NiO@MoNi4/C. It displays low potentials for UOR (E10/500/1000 = 1.28/1.41/1.47 V) and for HER (E−10/−500/−1000 = −38/−264/−355 mV) in 1.0 M KOH + 0.5 M urea electrolyte solution. The good activity is ascribed to the self‐supported lignin‐derived carbon and heterojunction, which increases the number of active sites, optimizes electronic structure, and improves electron transfer. Benefiting from the self‐supported lignin‐derived carbon, NiO@MoNi4/C demonstrates corrosion resistance and superhydrophilicity, which avoids Ostwald ripening and accelerates gas‐liquid transfer, thus, maintaining for 100 h at ±1000/±1500 mA cm−2 during the UOR and HER test. This work provides a good catalyst for urea electrolysis and presents a promising way for preparing lignin‐derived carbon‐based catalysts while expanding the application of lignin‐based biomass carbon materials.

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Ni-based electrocatalysts for urea oxidation reaction: mechanism, catalyst design strategies and future perspectives

Li,

Wang,

Pan

et al. 2024

Sci. China Mater.

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N-induced compressive strain in Ni-MoO2 heterostructure with micro-nano array for improving high-current-output urea-assisted water electrolysis performance

Cited by 9 publications

References 58 publications

Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Superhydrophilicity and Electronic Modulation on Self‐Supported Lignin‐Derived Carbon Coupled with NiO@MoNi₄ for Enhancing Urea Electrolysis

Ni-based electrocatalysts for urea oxidation reaction: mechanism, catalyst design strategies and future perspectives

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N-induced compressive strain in Ni-MoO2 heterostructure with micro-nano array for improving high-current-output urea-assisted water electrolysis performance

Cited by 9 publications

References 58 publications

Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Strategies for Tuning Tensile Strain and Localized Electrons in a Mo‐Doped NiCoCu Alloy for Enhancing Ampere‐Level Current Density HER Performance

Superhydrophilicity and Electronic Modulation on Self‐Supported Lignin‐Derived Carbon Coupled with NiO@MoNi4 for Enhancing Urea Electrolysis

Ni-based electrocatalysts for urea oxidation reaction: mechanism, catalyst design strategies and future perspectives

Contact Info

Product

Resources

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Superhydrophilicity and Electronic Modulation on Self‐Supported Lignin‐Derived Carbon Coupled with NiO@MoNi₄ for Enhancing Urea Electrolysis