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Concentrated KOH-activated 3D-printed martensitic steel for high-performance alkaline water electrolysis.

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Title: Concentrated KOH-activated 3D-printed martensitic steel for high-performance alkaline water electrolysis.
Authors: Li, Mingen1, Zhong, Chengcheng2, Su, Shichen1 shichensu@scnu.edu.cn, Wang, Shuangpeng2 spwang@um.edu.mo
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 9/28/2025, Vol. 54 Issue 36, p13764-13774. 11p.
Subjects: Water electrolysis, Electrocatalysts, Green fuels, Catalysts, Martensitic stainless steel, Nanoporous materials, Potassium hydroxide
Abstract: Alkaline water electrolysis (AWE) is a promising green hydrogen production technology, yet it is hindered by high-cost noble metal catalysts and poor low-cost alternatives. This study shows that 3D-printed martensitic steel, particularly a Ni11.0–Co13.5–Cr3.2–Mo1.2–C0.2–Fe70.9 alloy, becomes a highly efficient AWE electrocatalyst after cyclic voltammetry activation in KOH. Before activation the HER performance improved with higher Co but remained suboptimal, while after activation the alloy exhibited a remarkable enhancement: low overpotential at high current density and a drastically reduced Tafel slope. This improvement stems from surface reconstruction forming a nanoporous structure and a hydroxylated layer, increasing the electrochemically active surface area. This work provides a low-cost, high-performance alternative to noble metal catalysts, advancing green hydrogen scalability for energy and environmental challenges. [ABSTRACT FROM AUTHOR]
Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry 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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DbLabel: Engineering Source
An: 188013159
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PubTypeId: academicJournal
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  Label: Title
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  Data: Concentrated KOH-activated 3D-printed martensitic steel for high-performance alkaline water electrolysis.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Mingen%22">Li, Mingen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhong%2C+Chengcheng%22">Zhong, Chengcheng</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Su%2C+Shichen%22">Su, Shichen</searchLink><relatesTo>1</relatesTo><i> shichensu@scnu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Shuangpeng%22">Wang, Shuangpeng</searchLink><relatesTo>2</relatesTo><i> spwang@um.edu.mo</i>
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  Data: <searchLink fieldCode="JN" term="%22Dalton+Transactions%3A+An+International+Journal+of+Inorganic+Chemistry%22">Dalton Transactions: An International Journal of Inorganic Chemistry</searchLink>. 9/28/2025, Vol. 54 Issue 36, p13764-13774. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Water+electrolysis%22">Water electrolysis</searchLink><br /><searchLink fieldCode="DE" term="%22Electrocatalysts%22">Electrocatalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Green+fuels%22">Green fuels</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Martensitic+stainless+steel%22">Martensitic stainless steel</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoporous+materials%22">Nanoporous materials</searchLink><br /><searchLink fieldCode="DE" term="%22Potassium+hydroxide%22">Potassium hydroxide</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Alkaline water electrolysis (AWE) is a promising green hydrogen production technology, yet it is hindered by high-cost noble metal catalysts and poor low-cost alternatives. This study shows that 3D-printed martensitic steel, particularly a Ni11.0–Co13.5–Cr3.2–Mo1.2–C0.2–Fe70.9 alloy, becomes a highly efficient AWE electrocatalyst after cyclic voltammetry activation in KOH. Before activation the HER performance improved with higher Co but remained suboptimal, while after activation the alloy exhibited a remarkable enhancement: low overpotential at high current density and a drastically reduced Tafel slope. This improvement stems from surface reconstruction forming a nanoporous structure and a hydroxylated layer, increasing the electrochemically active surface area. This work provides a low-cost, high-performance alternative to noble metal catalysts, advancing green hydrogen scalability for energy and environmental challenges. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry 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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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1039/d5dt01776a
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 13764
    Subjects:
      – SubjectFull: Water electrolysis
        Type: general
      – SubjectFull: Electrocatalysts
        Type: general
      – SubjectFull: Green fuels
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Martensitic stainless steel
        Type: general
      – SubjectFull: Nanoporous materials
        Type: general
      – SubjectFull: Potassium hydroxide
        Type: general
    Titles:
      – TitleFull: Concentrated KOH-activated 3D-printed martensitic steel for high-performance alkaline water electrolysis.
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            NameFull: Li, Mingen
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            NameFull: Zhong, Chengcheng
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            NameFull: Su, Shichen
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            NameFull: Wang, Shuangpeng
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            – D: 28
              M: 09
              Text: 9/28/2025
              Type: published
              Y: 2025
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              Value: 54
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              Value: 36
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            – TitleFull: Dalton Transactions: An International Journal of Inorganic Chemistry
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