Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting
The performance of alkaline water electrolysis (AWE) at high current densities is limited by gas bubble generation on the surface of electrodes, which covers active sites and blocks mass transfer, resulting in lower AWE efficiency. Here, we utilize electro-etching to construct Ni electrodes with hyd...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-06-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417723001104 |
| _version_ | 1797820737364426752 |
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| author | Jugang Ma Mingye Yang Guanlei Zhao Yangyang Li Biao Liu Jian Dang Junjie Gu Song Hu Fuyuan Yang Minggao Ouyang |
| author_facet | Jugang Ma Mingye Yang Guanlei Zhao Yangyang Li Biao Liu Jian Dang Junjie Gu Song Hu Fuyuan Yang Minggao Ouyang |
| author_sort | Jugang Ma |
| collection | DOAJ |
| description | The performance of alkaline water electrolysis (AWE) at high current densities is limited by gas bubble generation on the surface of electrodes, which covers active sites and blocks mass transfer, resulting in lower AWE efficiency. Here, we utilize electro-etching to construct Ni electrodes with hydrophilic and aerophobic surfaces to improve the efficiency of AWE. Ni atoms on the Ni surface can be exfoliated orderly along the crystal planes by electro-etching, forming micro-nano-scale rough surfaces with multiple crystal planes exposed. The 3D-ordered surface structures increase the exposure of active sites and promote the removal of bubbles on the surface of the electrode during the AWE process. In addition, experimental results from high-speed camera reveal that rapidly released bubbles can improve the local circulation of electrolyte. Lastly, the accelerated durability test based on practical working condition demonstrates that the 3D-ordered surface structures are robust and durable during the AWE process. |
| first_indexed | 2024-03-13T09:42:39Z |
| format | Article |
| id | doaj.art-a1fde6f6894f4480b75af0eecd529d37 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-03-13T09:42:39Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-a1fde6f6894f4480b75af0eecd529d372023-05-25T04:24:04ZengElsevierUltrasonics Sonochemistry1350-41772023-06-0196106398Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splittingJugang Ma0Mingye Yang1Guanlei Zhao2Yangyang Li3Biao Liu4Jian Dang5Junjie Gu6Song Hu7Fuyuan Yang8Minggao Ouyang9State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; Corresponding authors.State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; Corresponding authors.State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; Corresponding authors.The performance of alkaline water electrolysis (AWE) at high current densities is limited by gas bubble generation on the surface of electrodes, which covers active sites and blocks mass transfer, resulting in lower AWE efficiency. Here, we utilize electro-etching to construct Ni electrodes with hydrophilic and aerophobic surfaces to improve the efficiency of AWE. Ni atoms on the Ni surface can be exfoliated orderly along the crystal planes by electro-etching, forming micro-nano-scale rough surfaces with multiple crystal planes exposed. The 3D-ordered surface structures increase the exposure of active sites and promote the removal of bubbles on the surface of the electrode during the AWE process. In addition, experimental results from high-speed camera reveal that rapidly released bubbles can improve the local circulation of electrolyte. Lastly, the accelerated durability test based on practical working condition demonstrates that the 3D-ordered surface structures are robust and durable during the AWE process.http://www.sciencedirect.com/science/article/pii/S1350417723001104Alkaline water electrolysisGas bubble3D-ordered surface structuresDurabilityHigh-speed camera |
| spellingShingle | Jugang Ma Mingye Yang Guanlei Zhao Yangyang Li Biao Liu Jian Dang Junjie Gu Song Hu Fuyuan Yang Minggao Ouyang Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting Ultrasonics Sonochemistry Alkaline water electrolysis Gas bubble 3D-ordered surface structures Durability High-speed camera |
| title | Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| title_full | Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| title_fullStr | Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| title_full_unstemmed | Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| title_short | Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| title_sort | ni electrodes with 3d ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting |
| topic | Alkaline water electrolysis Gas bubble 3D-ordered surface structures Durability High-speed camera |
| url | http://www.sciencedirect.com/science/article/pii/S1350417723001104 |
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