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Effects of intercalated anions on the interfacial oxygen evolution activity and selectivity of NiFe(OH)2 nanosheet array electrodes for seawater electrolysis.

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Title: Effects of intercalated anions on the interfacial oxygen evolution activity and selectivity of NiFe(OH)2 nanosheet array electrodes for seawater electrolysis.
Authors: Xiao, Fengyan1 (AUTHOR) hxzhicheng@163.com, Liu, Fangfang2 (AUTHOR), Xing, Qin1 (AUTHOR), Jiang, Runlai3 (AUTHOR), Liu, Yangjing3 (AUTHOR), Ge, Jiaxing3 (AUTHOR), Yan, Haofeng3 (AUTHOR), Ren, Jianwei4 (AUTHOR), Wang, Hui3 (AUTHOR) wangh@qust.edu.cn
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 5/5/2026, Vol. 55 Issue 17, p6786-6795. 10p.
Subjects: Oxygen evolution reactions, Catalyst selectivity, Hydrogen production, Layered double hydroxides, Intercalation reactions, Water electrolysis, Electrode performance
Abstract: Nickel–iron layered double hydroxides (NiFe-LDHs) are widely recognized as highly effective components for oxygen evolution reaction (OER) catalysis. However, their interfacial OER activity and selectivity under seawater electrolysis conditions remain insufficiently explored. In seawater electrolysis, the competitive chlorine evolution reaction (CER) is a major factor leading to reduced anode efficiency and accelerated electrode corrosion. To enhance the catalytic activity of interfacial sites in NiFe-LDHs while suppressing chlorine evolution, this study introduces various anions—including NO3−, CO32−, SO42−, and H2PO2−—into the interlayer galleries of NiFe-LDHs. Anion intercalation effectively modulates the oxidation states of Ni and Fe, strengthens OH− adsorption, and consequently improves both the OER activity and selectivity of the catalyst. In alkaline seawater electrolyte, the optimized electrode delivers a current density of 100 mA cm−2 at an overpotential of only 288 mV and mass activities of 24.2 mA mg−1 and 290.1 mA mg−1 at 1.50 V and 1.58 V, while exhibiting outstanding durability, with a negligible LSV shift of merely 4 mV after 6000 cyclic voltammetry cycles. Furthermore, measurements conducted in natural seawater reveal that H2PO2−-intercalated NiFe-LDH supported on carbon cloth achieves the highest oxygen evolution selectivity, reaching 65.2%. These results confirm that introducing functional anions into the interlayer region represents a viable route to improve OER selectivity during seawater electrolysis. Moreover, this strategy offers a rational framework for engineering highly efficient catalytic systems tailored for the direct utilization of natural seawater in hydrogen production applications. [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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  Label: Title
  Group: Ti
  Data: Effects of intercalated anions on the interfacial oxygen evolution activity and selectivity of NiFe(OH)<subscript>2</subscript> nanosheet array electrodes for seawater electrolysis.
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  Data: <searchLink fieldCode="AR" term="%22Xiao%2C+Fengyan%22">Xiao, Fengyan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hxzhicheng@163.com</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Fangfang%22">Liu, Fangfang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xing%2C+Qin%22">Xing, Qin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Runlai%22">Jiang, Runlai</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yangjing%22">Liu, Yangjing</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ge%2C+Jiaxing%22">Ge, Jiaxing</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Haofeng%22">Yan, Haofeng</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ren%2C+Jianwei%22">Ren, Jianwei</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Hui%22">Wang, Hui</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> wangh@qust.edu.cn</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>. 5/5/2026, Vol. 55 Issue 17, p6786-6795. 10p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Oxygen+evolution+reactions%22">Oxygen evolution reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Catalyst+selectivity%22">Catalyst selectivity</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+production%22">Hydrogen production</searchLink><br /><searchLink fieldCode="DE" term="%22Layered+double+hydroxides%22">Layered double hydroxides</searchLink><br /><searchLink fieldCode="DE" term="%22Intercalation+reactions%22">Intercalation reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Water+electrolysis%22">Water electrolysis</searchLink><br /><searchLink fieldCode="DE" term="%22Electrode+performance%22">Electrode performance</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Nickel–iron layered double hydroxides (NiFe-LDHs) are widely recognized as highly effective components for oxygen evolution reaction (OER) catalysis. However, their interfacial OER activity and selectivity under seawater electrolysis conditions remain insufficiently explored. In seawater electrolysis, the competitive chlorine evolution reaction (CER) is a major factor leading to reduced anode efficiency and accelerated electrode corrosion. To enhance the catalytic activity of interfacial sites in NiFe-LDHs while suppressing chlorine evolution, this study introduces various anions—including NO3−, CO32−, SO42−, and H2PO2−—into the interlayer galleries of NiFe-LDHs. Anion intercalation effectively modulates the oxidation states of Ni and Fe, strengthens OH− adsorption, and consequently improves both the OER activity and selectivity of the catalyst. In alkaline seawater electrolyte, the optimized electrode delivers a current density of 100 mA cm−2 at an overpotential of only 288 mV and mass activities of 24.2 mA mg−1 and 290.1 mA mg−1 at 1.50 V and 1.58 V, while exhibiting outstanding durability, with a negligible LSV shift of merely 4 mV after 6000 cyclic voltammetry cycles. Furthermore, measurements conducted in natural seawater reveal that H2PO2−-intercalated NiFe-LDH supported on carbon cloth achieves the highest oxygen evolution selectivity, reaching 65.2%. These results confirm that introducing functional anions into the interlayer region represents a viable route to improve OER selectivity during seawater electrolysis. Moreover, this strategy offers a rational framework for engineering highly efficient catalytic systems tailored for the direct utilization of natural seawater in hydrogen production applications. [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/d6dt00456c
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 6786
    Subjects:
      – SubjectFull: Oxygen evolution reactions
        Type: general
      – SubjectFull: Catalyst selectivity
        Type: general
      – SubjectFull: Hydrogen production
        Type: general
      – SubjectFull: Layered double hydroxides
        Type: general
      – SubjectFull: Intercalation reactions
        Type: general
      – SubjectFull: Water electrolysis
        Type: general
      – SubjectFull: Electrode performance
        Type: general
    Titles:
      – TitleFull: Effects of intercalated anions on the interfacial oxygen evolution activity and selectivity of NiFe(OH)2 nanosheet array electrodes for seawater electrolysis.
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            – D: 05
              M: 05
              Text: 5/5/2026
              Type: published
              Y: 2026
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