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Defect engineering of Ni3N/Mo2C heterostructure for enhanced alkaline hydrogen evolution reaction performance.

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Title: Defect engineering of Ni3N/Mo2C heterostructure for enhanced alkaline hydrogen evolution reaction performance.
Authors: Rafaqat, Muhammad1,2 (AUTHOR), Shen, Lisha1,2 (AUTHOR) shenls@ms.giec.ac.cn, Munawar, Tauseef2 (AUTHOR), Zhiming, Tu2 (AUTHOR), Zhao, Chenglin1,2 (AUTHOR), Wang, Zhida1,2 (AUTHOR), Tan, Hongyi1 (AUTHOR), Guo, Changqing2 (AUTHOR), Yan, Chang-Feng1,2 (AUTHOR) yancf@ms.giec.ac.cn
Source: International Journal of Hydrogen Energy. Jan2026, Vol. 198, pN.PAG-N.PAG. 1p.
Subjects: Hydrogen evolution reactions, Electrocatalysts, Zinc ions, Water electrolysis, Hydrothermal synthesis, Materials science, Hydrogen production
Abstract: Electrocatalytic water splitting is being considered an effective approach to address the increasing energy crises and environmental issues. But it still suffers from a lack of efficient and stable electrocatalysts. Developing electrocatalysts through an integration of defect engineering and heterojunction engineering could be a reliable solution for improved activity, stability, and practicability. In this context, a heterostructure of Ni 3 N/Mo 2 C@CP was synthesized using a facile hydrothermal method and two-step heating treatment, including carbonization and nitridation. Moreover, the defects were intentionally produced by zinc intermediate doping in Ni 3 N/Mo 2 C@CP. The ratio of Zn versus Ni and Mo metal precursor was gradually increased to optimize the defects in Ni 3 N/Mo 2 C@CP heterostructure for excellent HER performance. Eventually, the optimized defect-rich Ni 3 N/Mo 2 C@CP-0.3 heterostructure requires only a small overpotential of 65 mV to attain the current density of 10 mA cm−2, indicating a remarkable HER performance. Apart from the HER activity, defect-rich Ni 3 N/Mo 2 C@CP-0.3 heterostructure exhibited long-term stability over 112 h for continuous electrochemical hydrogen production. [Display omitted] • A heterostructure of Ni 3 N/Mo 2 C synthesized using a facile hydrothermal method. • Defects introduced in the catalysts using Zn as an intermediate. • Defects optimized in Ni 3 N/Mo 2 C by tuning dopant to precursor ratio. • Nickel vacancies and edge dislocation defects observed simultaneously. • Defect-rich Ni 3 N/Mo 2 C@CP-0.3 showed good HER performance (η 10 = 65 mV). [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Electrocatalytic water splitting is being considered an effective approach to address the increasing energy crises and environmental issues. But it still suffers from a lack of efficient and stable electrocatalysts. Developing electrocatalysts through an integration of defect engineering and heterojunction engineering could be a reliable solution for improved activity, stability, and practicability. In this context, a heterostructure of Ni 3 N/Mo 2 C@CP was synthesized using a facile hydrothermal method and two-step heating treatment, including carbonization and nitridation. Moreover, the defects were intentionally produced by zinc intermediate doping in Ni 3 N/Mo 2 C@CP. The ratio of Zn versus Ni and Mo metal precursor was gradually increased to optimize the defects in Ni 3 N/Mo 2 C@CP heterostructure for excellent HER performance. Eventually, the optimized defect-rich Ni 3 N/Mo 2 C@CP-0.3 heterostructure requires only a small overpotential of 65 mV to attain the current density of 10 mA cm−2, indicating a remarkable HER performance. Apart from the HER activity, defect-rich Ni 3 N/Mo 2 C@CP-0.3 heterostructure exhibited long-term stability over 112 h for continuous electrochemical hydrogen production. [Display omitted] • A heterostructure of Ni 3 N/Mo 2 C synthesized using a facile hydrothermal method. • Defects introduced in the catalysts using Zn as an intermediate. • Defects optimized in Ni 3 N/Mo 2 C by tuning dopant to precursor ratio. • Nickel vacancies and edge dislocation defects observed simultaneously. • Defect-rich Ni 3 N/Mo 2 C@CP-0.3 showed good HER performance (η 10 = 65 mV). [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2025.152766