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FeNi co-doped MnO2 nanosheet arrays enable efficient water splitting performance.

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Title: FeNi co-doped MnO2 nanosheet arrays enable efficient water splitting performance.
Authors: Zheng, Fang1 (AUTHOR), Fang, Zhenhua1 (AUTHOR), Gaikwad, Mayur A.1 (AUTHOR), Jang, Suyoung1 (AUTHOR), Kim, Jin Hyeok1 (AUTHOR) jinhyeok@chonnam.ac.kr
Source: Journal of Materials Science: Materials in Electronics. Jun2025, Vol. 36 Issue 16, p1-10. 10p.
Abstract: Developing efficient and stable bifunctional electrocatalysts is key to achieving renewable energy-driven water splitting. Herein, bimetallic-doped δ MnO2 (FeNi-δ MnO2) was prepared by hydrothermal and self-assembly methods. FeNi-δ MnO₂ exhibits excellent alkaline water redox performance, with an overpotential of 260 mV for oxygen evolution reaction (OER) and 186 mV for hydrogen evolution reaction (HER) at a current density of 10 mA cm⁻2. In addition, the long-term stability of the FeNi-δ MnO2 catalyst for OER and HER is maintained for 50 and 60 h, respectively, at a current density of 500 mA cm⁻2. The nanosheet array morphology was preserved after FeNi co-doping, indicating that the doping process did not compromise structural integrity and effectively exposed active sites, thereby enhancing catalytic activity. In addition, introducing Fe3⁺ leads to adjusting the Mn3⁺/Mn4⁺ ratio, enhancing the electronic conductivity. FeNi-δ MnO2 was used as cathode and anode for water electrolysis, and the cell voltage was 1.67 V at a current density of 10 mA cm−2. This work provides a new strategy for designing low-cost, high-performance bifunctional electrocatalysts. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature 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
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  Data: FeNi co-doped MnO<subscript>2</subscript> nanosheet arrays enable efficient water splitting performance.
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  Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Fang%22">Zheng, Fang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fang%2C+Zhenhua%22">Fang, Zhenhua</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gaikwad%2C+Mayur+A%2E%22">Gaikwad, Mayur A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jang%2C+Suyoung%22">Jang, Suyoung</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Jin+Hyeok%22">Kim, Jin Hyeok</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jinhyeok@chonnam.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%3A+Materials+in+Electronics%22">Journal of Materials Science: Materials in Electronics</searchLink>. Jun2025, Vol. 36 Issue 16, p1-10. 10p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Developing efficient and stable bifunctional electrocatalysts is key to achieving renewable energy-driven water splitting. Herein, bimetallic-doped δ MnO2 (FeNi-δ MnO2) was prepared by hydrothermal and self-assembly methods. FeNi-δ MnO₂ exhibits excellent alkaline water redox performance, with an overpotential of 260 mV for oxygen evolution reaction (OER) and 186 mV for hydrogen evolution reaction (HER) at a current density of 10 mA cm⁻2. In addition, the long-term stability of the FeNi-δ MnO2 catalyst for OER and HER is maintained for 50 and 60 h, respectively, at a current density of 500 mA cm⁻2. The nanosheet array morphology was preserved after FeNi co-doping, indicating that the doping process did not compromise structural integrity and effectively exposed active sites, thereby enhancing catalytic activity. In addition, introducing Fe3⁺ leads to adjusting the Mn3⁺/Mn4⁺ ratio, enhancing the electronic conductivity. FeNi-δ MnO2 was used as cathode and anode for water electrolysis, and the cell voltage was 1.67 V at a current density of 10 mA cm−2. This work provides a new strategy for designing low-cost, high-performance bifunctional electrocatalysts. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature 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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        Value: 10.1007/s10854-025-14939-0
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        Text: English
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            NameFull: Gaikwad, Mayur A.
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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