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Sol–Gel Synthesized Co‐Doped Ilmenite‐NiTiO3 for Oxygen Evolution Reaction: Interplay of Inductive Effect and Crystal Structure.

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Title: Sol–Gel Synthesized Co‐Doped Ilmenite‐NiTiO3 for Oxygen Evolution Reaction: Interplay of Inductive Effect and Crystal Structure.
Authors: Jaiswal, Shraddha1 (AUTHOR), Chandra Gupta, Subash1 (AUTHOR), Gupta, Asha1 (AUTHOR) asha.chy@itbhu.ac.in
Source: ChemCatChem. 6/23/2025, Vol. 17 Issue 12, p1-11. 11p.
Subjects: Oxygen evolution reactions, Inductive effect, Sol-gel processes, Catalysts, Titanates, Alkaline solutions, Electrocatalysis
Abstract: The oxygen evolution reaction is key to advancing hydrogen production, energy storage, and sustainable energy technologies. In this study, we have explored the ilmenite‐type Co‐substituted NiTiO3 as a promising OER catalyst in the alkaline electrolyte. Synergistic interaction between Ni and Co generates the inductive effect which enhances the ionicity of Ni─O bond leading to a greater overlap between Ni(3d) and O(2p) orbitals, resulting in a higher OER activity of the doped catalysts. Further presence of surface active Co3+ in the ilmenite structure plays a key role in the enhancement of OER activity of the catalyst. A systematic investigation of the OER activity of Ni1‐xCoxTiO3 (0 < x < 0.25) with different amounts of Co doping synthesized via sol–gel method is reported here. Among the compositions investigated, Ni0.825Co0.175TiO3 is the most active as it exhibits excellent activity with a Tafel slope of 56 mV dec−1 and a overpotential of 395 mV at 10 mA cm−2. This work presents the role of the inductive effect originating due to the difference in the electronegativity of neighboring cations, leading to alteration of the redox energies and facilitating the effective electron transfer required for the electrocatalytic OER, which can be further utilized to develop superior electrocatalysts. [ABSTRACT FROM AUTHOR]
Copyright of ChemCatChem is the property of Wiley-Blackwell 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.)
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  Data: Sol–Gel Synthesized Co‐Doped Ilmenite‐NiTiO&lt;subscript&gt;3&lt;/subscript&gt; for Oxygen Evolution Reaction: Interplay of Inductive Effect and Crystal Structure.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22ChemCatChem%22&quot;&gt;ChemCatChem&lt;/searchLink&gt;. 6/23/2025, Vol. 17 Issue 12, p1-11. 11p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Oxygen+evolution+reactions%22&quot;&gt;Oxygen evolution reactions&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Inductive+effect%22&quot;&gt;Inductive effect&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Sol-gel+processes%22&quot;&gt;Sol-gel processes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Catalysts%22&quot;&gt;Catalysts&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Titanates%22&quot;&gt;Titanates&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Alkaline+solutions%22&quot;&gt;Alkaline solutions&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Electrocatalysis%22&quot;&gt;Electrocatalysis&lt;/searchLink&gt;
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  Data: The oxygen evolution reaction is key to advancing hydrogen production, energy storage, and sustainable energy technologies. In this study, we have explored the ilmenite‐type Co‐substituted NiTiO3 as a promising OER catalyst in the alkaline electrolyte. Synergistic interaction between Ni and Co generates the inductive effect which enhances the ionicity of Ni─O bond leading to a greater overlap between Ni(3d) and O(2p) orbitals, resulting in a higher OER activity of the doped catalysts. Further presence of surface active Co3+ in the ilmenite structure plays a key role in the enhancement of OER activity of the catalyst. A systematic investigation of the OER activity of Ni1‐xCoxTiO3 (0 &lt; x &lt; 0.25) with different amounts of Co doping synthesized via sol–gel method is reported here. Among the compositions investigated, Ni0.825Co0.175TiO3 is the most active as it exhibits excellent activity with a Tafel slope of 56 mV dec−1 and a overpotential of 395 mV at 10 mA cm−2. This work presents the role of the inductive effect originating due to the difference in the electronegativity of neighboring cations, leading to alteration of the redox energies and facilitating the effective electron transfer required for the electrocatalytic OER, which can be further utilized to develop superior electrocatalysts. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: &lt;i&gt;Copyright of ChemCatChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/cctc.202500396
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Oxygen evolution reactions
        Type: general
      – SubjectFull: Inductive effect
        Type: general
      – SubjectFull: Sol-gel processes
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Titanates
        Type: general
      – SubjectFull: Alkaline solutions
        Type: general
      – SubjectFull: Electrocatalysis
        Type: general
    Titles:
      – TitleFull: Sol–Gel Synthesized Co‐Doped Ilmenite‐NiTiO3 for Oxygen Evolution Reaction: Interplay of Inductive Effect and Crystal Structure.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Jaiswal, Shraddha
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          Name:
            NameFull: Chandra Gupta, Subash
      – PersonEntity:
          Name:
            NameFull: Gupta, Asha
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            – D: 23
              M: 06
              Text: 6/23/2025
              Type: published
              Y: 2025
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              Value: 18673880
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              Value: 17
            – Type: issue
              Value: 12
          Titles:
            – TitleFull: ChemCatChem
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