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Heterogeneous interface and vacancy engineering contribute to metastable catalysts for overall water splitting.

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Title: Heterogeneous interface and vacancy engineering contribute to metastable catalysts for overall water splitting.
Authors: Du, Li1 (AUTHOR), Chen, Li Bo1 (AUTHOR), Liu, Xu1 (AUTHOR), Yang, Chun Cheng1 (AUTHOR) ccyang@jlu.edu.cn, Jiang, Qing1 (AUTHOR) jiangq@jlu.edu.cn
Source: Acta Materialia. May2025, Vol. 289, pN.PAG-N.PAG. 1p.
Subjects: Phase transitions, Ion-permeable membranes, Oxygen vacancy, Thermal shock, Catalytic activity, Oxygen evolution reactions, Foam
Abstract: Metastable catalysts usually exhibit exceptional catalytic activity, but still face the challenges of phase transition and complex synthesis, diminishing their stability and practicality. Herein, guided by density functional theory calculations, a self-supported electrode of Co, Fe-doped metastable hexagonal close-packed (hcp) Ni/NiO heterogeneous structure on nickel foam (Co, Fe-Ni/NiO/NF) was constructed by thermal shock. Spherical aberration corrected transmission electron microscopy confirms the hcp crystal structure of Ni and the phase interface of hcp Ni/NiO heterostructure. Moreover, the dynamic reaction mechanisms of the catalysts is deeply investigated by in-situ Raman spectroscopy. Benefitting from the co-regulation of heterogeneous interface and vacancy engineering, accompanied by the self-adjustment of active sites, this electrode exhibits superior catalytic activity and stability with low overpotentials of 26 and 215 mV for hydrogen evolution reaction and oxygen evolution reaction at 10 mA cm−2. The anion exchange membrane electrolyzer comprised of the Co, Fe-Ni/NiO/NF electrodes requires only 1.48 V to drive water splitting, and achieves 1.0 A cm−2 at 2.55 V, showing great potential for practical applications. [Display omitted] Guided by DFT simulations, a metastable catalyst of Co, Fe-Ni/NiO/NF is synthesized by a facile and efficient approach of thermal shock. Owing to the synergistic effect of rich oxygen vacancies and heterogeneous interfaces, both the electrocatalytic activity and stability of Co, Fe-Ni/NiO/NF are significantly enhanced and the excellent AEM water electrolyzer performance is also achieved. [ABSTRACT FROM AUTHOR]
Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 184037361
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Heterogeneous interface and vacancy engineering contribute to metastable catalysts for overall water splitting.
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  Data: <searchLink fieldCode="AR" term="%22Du%2C+Li%22">Du, Li</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Li+Bo%22">Chen, Li Bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Xu%22">Liu, Xu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Chun+Cheng%22">Yang, Chun Cheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ccyang@jlu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Jiang%2C+Qing%22">Jiang, Qing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jiangq@jlu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Acta+Materialia%22">Acta Materialia</searchLink>. May2025, Vol. 289, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Ion-permeable+membranes%22">Ion-permeable membranes</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+vacancy%22">Oxygen vacancy</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+shock%22">Thermal shock</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+activity%22">Catalytic activity</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+evolution+reactions%22">Oxygen evolution reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Foam%22">Foam</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Metastable catalysts usually exhibit exceptional catalytic activity, but still face the challenges of phase transition and complex synthesis, diminishing their stability and practicality. Herein, guided by density functional theory calculations, a self-supported electrode of Co, Fe-doped metastable hexagonal close-packed (hcp) Ni/NiO heterogeneous structure on nickel foam (Co, Fe-Ni/NiO/NF) was constructed by thermal shock. Spherical aberration corrected transmission electron microscopy confirms the hcp crystal structure of Ni and the phase interface of hcp Ni/NiO heterostructure. Moreover, the dynamic reaction mechanisms of the catalysts is deeply investigated by in-situ Raman spectroscopy. Benefitting from the co-regulation of heterogeneous interface and vacancy engineering, accompanied by the self-adjustment of active sites, this electrode exhibits superior catalytic activity and stability with low overpotentials of 26 and 215 mV for hydrogen evolution reaction and oxygen evolution reaction at 10 mA cm−2. The anion exchange membrane electrolyzer comprised of the Co, Fe-Ni/NiO/NF electrodes requires only 1.48 V to drive water splitting, and achieves 1.0 A cm−2 at 2.55 V, showing great potential for practical applications. [Display omitted] Guided by DFT simulations, a metastable catalyst of Co, Fe-Ni/NiO/NF is synthesized by a facile and efficient approach of thermal shock. Owing to the synergistic effect of rich oxygen vacancies and heterogeneous interfaces, both the electrocatalytic activity and stability of Co, Fe-Ni/NiO/NF are significantly enhanced and the excellent AEM water electrolyzer performance is also achieved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.actamat.2025.120934
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Ion-permeable membranes
        Type: general
      – SubjectFull: Oxygen vacancy
        Type: general
      – SubjectFull: Thermal shock
        Type: general
      – SubjectFull: Catalytic activity
        Type: general
      – SubjectFull: Oxygen evolution reactions
        Type: general
      – SubjectFull: Foam
        Type: general
    Titles:
      – TitleFull: Heterogeneous interface and vacancy engineering contribute to metastable catalysts for overall water splitting.
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            NameFull: Du, Li
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            NameFull: Chen, Li Bo
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            NameFull: Liu, Xu
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            NameFull: Yang, Chun Cheng
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            – D: 01
              M: 05
              Text: May2025
              Type: published
              Y: 2025
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              Value: 289
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