Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability
Self‐repairing catalysts are useful for achieving alkaline water electrolyzers with long lifetimes under intermittent operation. However, rational methodologies for designing self‐repairing catalysts have not yet been established. Herein, hybrid cobalt hydroxide nanosheets (Co‐ns), with a high depos...
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Wiley-VCH
2024-11-01
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| Series: | Advanced Energy & Sustainability Research |
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| Online Access: | https://doi.org/10.1002/aesr.202400196 |
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| author | Yoshiyuki Kuroda Daiji Mizukoshi Vinay Yadav Tatsuya Taniguchi Yuta Sasaki Yoshinori Nishiki Zaenal Awaludin Akihiro Kato Shigenori Mitsushima |
| author_facet | Yoshiyuki Kuroda Daiji Mizukoshi Vinay Yadav Tatsuya Taniguchi Yuta Sasaki Yoshinori Nishiki Zaenal Awaludin Akihiro Kato Shigenori Mitsushima |
| author_sort | Yoshiyuki Kuroda |
| collection | DOAJ |
| description | Self‐repairing catalysts are useful for achieving alkaline water electrolyzers with long lifetimes under intermittent operation. However, rational methodologies for designing self‐repairing catalysts have not yet been established. Herein, hybrid cobalt hydroxide nanosheets (Co‐ns), with a high deposition (repairing) rate, and β‐FeOOH nanorods (Fe‐nr), with high oxygen evolution reaction (OER) ability, are electrostatically self‐assembled into composite catalysts. This strategy is developed to integrate multifunctionality in self‐repairing catalysts. Positively charged Co‐ns and negatively charged Fe‐nr form uniform composites when dispersed in an electrolyte. These composites are electrochemically deposited on a nickel electrode by electrolysis at 800 mA cm−2. Co‐ns form a conductive mesoporous assembly of CoOOH nanosheets as a support. Fe‐nr are then distributed on the CoOOH nanosheets as active sites for the OER. Because of the high deposition rate of Co‐ns, the amount of Fe‐nr deposited increases 22 times compared to when Fe‐nr is deposited alone, and the OER current density increases 14 times compared to that of Co‐ns alone. The composite self‐repair catalyst shows the highest activity and durability under an accelerated durability test (ADT), and its degradation rate decreases from 84 μV cycle−1 (Fe‐nr only) to 60 μV cycle−1 (composite catalyst) under ADT conditions without repair. |
| format | Article |
| id | doaj-art-a73fa733fbdd445ab4b394a082b54f02 |
| institution | OA Journals |
| issn | 2699-9412 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Energy & Sustainability Research |
| spelling | doaj-art-a73fa733fbdd445ab4b394a082b54f022025-08-20T02:12:38ZengWiley-VCHAdvanced Energy & Sustainability Research2699-94122024-11-01511n/an/a10.1002/aesr.202400196Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and DurabilityYoshiyuki Kuroda0Daiji Mizukoshi1Vinay Yadav2Tatsuya Taniguchi3Yuta Sasaki4Yoshinori Nishiki5Zaenal Awaludin6Akihiro Kato7Shigenori Mitsushima8Department of Chemistry Applications and Life Science Graduate School of Engineering Science Yokohama National University 79‐5 Tokiwadai, Hodogaya‐ku Yokohama Kanagawa 240‐8501 JapanDepartment of Chemistry Applications and Life Science Graduate School of Engineering Science Yokohama National University 79‐5 Tokiwadai, Hodogaya‐ku Yokohama Kanagawa 240‐8501 JapanDepartment of Chemistry Applications and Life Science Graduate School of Engineering Science Yokohama National University 79‐5 Tokiwadai, Hodogaya‐ku Yokohama Kanagawa 240‐8501 JapanKawasaki Heavy Industries Ltd. 1‐1 Kawasaki‐cho Akashi Hyogo 673‐8666 JapanKawasaki Heavy Industries Ltd. 1‐1 Kawasaki‐cho Akashi Hyogo 673‐8666 JapanDe Nora Permelec Ltd. 2023‐15 Endo Fujisawa Kanagawa 252‐0816 JapanDe Nora Permelec Ltd. 2023‐15 Endo Fujisawa Kanagawa 252‐0816 JapanDe Nora Permelec Ltd. 2023‐15 Endo Fujisawa Kanagawa 252‐0816 JapanDepartment of Chemistry Applications and Life Science Graduate School of Engineering Science Yokohama National University 79‐5 Tokiwadai, Hodogaya‐ku Yokohama Kanagawa 240‐8501 JapanSelf‐repairing catalysts are useful for achieving alkaline water electrolyzers with long lifetimes under intermittent operation. However, rational methodologies for designing self‐repairing catalysts have not yet been established. Herein, hybrid cobalt hydroxide nanosheets (Co‐ns), with a high deposition (repairing) rate, and β‐FeOOH nanorods (Fe‐nr), with high oxygen evolution reaction (OER) ability, are electrostatically self‐assembled into composite catalysts. This strategy is developed to integrate multifunctionality in self‐repairing catalysts. Positively charged Co‐ns and negatively charged Fe‐nr form uniform composites when dispersed in an electrolyte. These composites are electrochemically deposited on a nickel electrode by electrolysis at 800 mA cm−2. Co‐ns form a conductive mesoporous assembly of CoOOH nanosheets as a support. Fe‐nr are then distributed on the CoOOH nanosheets as active sites for the OER. Because of the high deposition rate of Co‐ns, the amount of Fe‐nr deposited increases 22 times compared to when Fe‐nr is deposited alone, and the OER current density increases 14 times compared to that of Co‐ns alone. The composite self‐repair catalyst shows the highest activity and durability under an accelerated durability test (ADT), and its degradation rate decreases from 84 μV cycle−1 (Fe‐nr only) to 60 μV cycle−1 (composite catalyst) under ADT conditions without repair.https://doi.org/10.1002/aesr.202400196organic–inorganic hybrid compositesoxygen evolution reactionsself‐assemblyself‐repairwater splitting |
| spellingShingle | Yoshiyuki Kuroda Daiji Mizukoshi Vinay Yadav Tatsuya Taniguchi Yuta Sasaki Yoshinori Nishiki Zaenal Awaludin Akihiro Kato Shigenori Mitsushima Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability Advanced Energy & Sustainability Research organic–inorganic hybrid composites oxygen evolution reactions self‐assembly self‐repair water splitting |
| title | Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability |
| title_full | Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability |
| title_fullStr | Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability |
| title_full_unstemmed | Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability |
| title_short | Integration of Multifunctionality in a Colloidal Self‐Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability |
| title_sort | integration of multifunctionality in a colloidal self repairing catalyst for alkaline water electrolysis to achieve high activity and durability |
| topic | organic–inorganic hybrid composites oxygen evolution reactions self‐assembly self‐repair water splitting |
| url | https://doi.org/10.1002/aesr.202400196 |
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