In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application
The deprived electrochemical kinetics of the oxygen evolution reaction (OER) catalyst is the prime bottleneck and remains the major obstacle in the water electrolysis processes. Herein, a facile hydrothermal technique was implemented to form a freestanding polyhedron-like Co<sub>3</sub>O...
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2024-10-01
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| author | Abu Talha Aqueel Ahmed Vijaya Gopalan Sree Abhishek Meena Akbar I. Inamdar Hyunsik Im Sangeun Cho |
| author_facet | Abu Talha Aqueel Ahmed Vijaya Gopalan Sree Abhishek Meena Akbar I. Inamdar Hyunsik Im Sangeun Cho |
| author_sort | Abu Talha Aqueel Ahmed |
| collection | DOAJ |
| description | The deprived electrochemical kinetics of the oxygen evolution reaction (OER) catalyst is the prime bottleneck and remains the major obstacle in the water electrolysis processes. Herein, a facile hydrothermal technique was implemented to form a freestanding polyhedron-like Co<sub>3</sub>O<sub>4</sub> on the microporous architecture of Ni foam, its reaction kinetics enhanced through sulfide counterpart transformation in the presence of Na<sub>2</sub>S, and their catalytic OER performances comparatively investigated in 1 M KOH medium. The formed Co<sub>3</sub>S<sub>4</sub> catalyst shows outstanding catalytic OER activity at a current density of 100 mA cm<sup>−2</sup> by achieving a relatively low overpotential of 292 mV compared to the pure Co<sub>3</sub>O<sub>4</sub> catalyst and the commercial IrO<sub>2</sub> catalyst. This enhancement results from the improved active centers and conductivity, which boost the intrinsic reaction kinetics. Further, the optimized Co<sub>3</sub>S<sub>4</sub> catalyst exhibits admirable prolonged durability up to 72 h at varied current rates with insignificant selectivity decay. The energy dispersive X-ray spectroscopy (EDX) and Raman spectra measured after the prolonged OER stability test reveal a partial transformation of the active catalyst into an oxyhydroxide phase (i.e., CoOOH@Co<sub>3</sub>S<sub>4</sub>), which acts as an active catalyst phase during the electrolysis process. |
| format | Article |
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| institution | Kabale University |
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| publishDate | 2024-10-01 |
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| series | Nanomaterials |
| spelling | doaj-art-c6d8f47c8dea437ab5d10efdbefc9df82024-11-08T14:38:52ZengMDPI AGNanomaterials2079-49912024-10-011421173210.3390/nano14211732In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER ApplicationAbu Talha Aqueel Ahmed0Vijaya Gopalan Sree1Abhishek Meena2Akbar I. Inamdar3Hyunsik Im4Sangeun Cho5Division of System Semiconductor, Dongguk University, Seoul 04620, Republic of KoreaDepartment of Physics, Dongguk University, Seoul 04620, Republic of KoreaDivision of System Semiconductor, Dongguk University, Seoul 04620, Republic of KoreaDivision of System Semiconductor, Dongguk University, Seoul 04620, Republic of KoreaDivision of System Semiconductor, Dongguk University, Seoul 04620, Republic of KoreaDivision of System Semiconductor, Dongguk University, Seoul 04620, Republic of KoreaThe deprived electrochemical kinetics of the oxygen evolution reaction (OER) catalyst is the prime bottleneck and remains the major obstacle in the water electrolysis processes. Herein, a facile hydrothermal technique was implemented to form a freestanding polyhedron-like Co<sub>3</sub>O<sub>4</sub> on the microporous architecture of Ni foam, its reaction kinetics enhanced through sulfide counterpart transformation in the presence of Na<sub>2</sub>S, and their catalytic OER performances comparatively investigated in 1 M KOH medium. The formed Co<sub>3</sub>S<sub>4</sub> catalyst shows outstanding catalytic OER activity at a current density of 100 mA cm<sup>−2</sup> by achieving a relatively low overpotential of 292 mV compared to the pure Co<sub>3</sub>O<sub>4</sub> catalyst and the commercial IrO<sub>2</sub> catalyst. This enhancement results from the improved active centers and conductivity, which boost the intrinsic reaction kinetics. Further, the optimized Co<sub>3</sub>S<sub>4</sub> catalyst exhibits admirable prolonged durability up to 72 h at varied current rates with insignificant selectivity decay. The energy dispersive X-ray spectroscopy (EDX) and Raman spectra measured after the prolonged OER stability test reveal a partial transformation of the active catalyst into an oxyhydroxide phase (i.e., CoOOH@Co<sub>3</sub>S<sub>4</sub>), which acts as an active catalyst phase during the electrolysis process.https://www.mdpi.com/2079-4991/14/21/1732hydrothermal growthanion exchangewater electrolysisheterostructureoxygen evolution reaction |
| spellingShingle | Abu Talha Aqueel Ahmed Vijaya Gopalan Sree Abhishek Meena Akbar I. Inamdar Hyunsik Im Sangeun Cho In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application Nanomaterials hydrothermal growth anion exchange water electrolysis heterostructure oxygen evolution reaction |
| title | In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application |
| title_full | In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application |
| title_fullStr | In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application |
| title_full_unstemmed | In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application |
| title_short | In Situ Transformed CoOOH@Co<sub>3</sub>S<sub>4</sub> Heterostructured Catalyst for Highly Efficient Catalytic OER Application |
| title_sort | in situ transformed coooh co sub 3 sub s sub 4 sub heterostructured catalyst for highly efficient catalytic oer application |
| topic | hydrothermal growth anion exchange water electrolysis heterostructure oxygen evolution reaction |
| url | https://www.mdpi.com/2079-4991/14/21/1732 |
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