High capacity surface route discharge at the potassium-O2 electrode
Discharge by a surface route at the cathode of an aprotic metal-O2 battery typically results in surface passivation by the non-conducting oxide product. This leads to low capacity and early cell death. Here we investigate the cathode discharge reaction in the potassium-O2 battery and demonstrate tha...
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| Format: | Article |
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Elsevier
2018
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| Online Access: | https://eprints.nottingham.ac.uk/50717/ |
| _version_ | 1848798322758778880 |
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| author | Chen, Yuhui Jovanov, Zarko P. Gao, Xiangwen Liu, Jingyuan Holc, Conrad Johnson, Lee R. Bruce, Peter G. |
| author_facet | Chen, Yuhui Jovanov, Zarko P. Gao, Xiangwen Liu, Jingyuan Holc, Conrad Johnson, Lee R. Bruce, Peter G. |
| author_sort | Chen, Yuhui |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Discharge by a surface route at the cathode of an aprotic metal-O2 battery typically results in surface passivation by the non-conducting oxide product. This leads to low capacity and early cell death. Here we investigate the cathode discharge reaction in the potassium-O2 battery and demonstrate that discharge by a surface route is not limited to growth of thin (<10 nm) metal oxide layers. Electrochemical analysis and in situ Raman confirmed that the product of the cathode reaction is a combination of KO2 and K2O2, depending on the applied potential. Use of the low donor number solvent, acetonitrile, allows us to directly probe the surface route. Rotating ring-disk electrode, electrochemical quartz crystal microbalance and scanning electron microscope characterisations clearly demonstrate the formation of a thick > 1 μm product layer, far in excess of that possible in the related lithium-O2 battery. These results demonstrate a high-capacity surface route in a metal-O2 battery for the first time and the insights revealed here have significant implications for the design of the K-O2 battery. |
| first_indexed | 2025-11-14T20:17:56Z |
| format | Article |
| id | nottingham-50717 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:17:56Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-507172024-08-15T15:29:45Z https://eprints.nottingham.ac.uk/50717/ High capacity surface route discharge at the potassium-O2 electrode Chen, Yuhui Jovanov, Zarko P. Gao, Xiangwen Liu, Jingyuan Holc, Conrad Johnson, Lee R. Bruce, Peter G. Discharge by a surface route at the cathode of an aprotic metal-O2 battery typically results in surface passivation by the non-conducting oxide product. This leads to low capacity and early cell death. Here we investigate the cathode discharge reaction in the potassium-O2 battery and demonstrate that discharge by a surface route is not limited to growth of thin (<10 nm) metal oxide layers. Electrochemical analysis and in situ Raman confirmed that the product of the cathode reaction is a combination of KO2 and K2O2, depending on the applied potential. Use of the low donor number solvent, acetonitrile, allows us to directly probe the surface route. Rotating ring-disk electrode, electrochemical quartz crystal microbalance and scanning electron microscope characterisations clearly demonstrate the formation of a thick > 1 μm product layer, far in excess of that possible in the related lithium-O2 battery. These results demonstrate a high-capacity surface route in a metal-O2 battery for the first time and the insights revealed here have significant implications for the design of the K-O2 battery. Elsevier 2018-06-15 Article PeerReviewed Chen, Yuhui, Jovanov, Zarko P., Gao, Xiangwen, Liu, Jingyuan, Holc, Conrad, Johnson, Lee R. and Bruce, Peter G. (2018) High capacity surface route discharge at the potassium-O2 electrode. Journal of Electroanalytical Chemistry, 819 . pp. 542-546. ISSN 1873-2569 Metal-air; Oxygen reduction https://www.sciencedirect.com/science/article/pii/S1572665718302108 doi:10.1016/j.jelechem.2018.03.041 doi:10.1016/j.jelechem.2018.03.041 |
| spellingShingle | Metal-air; Oxygen reduction Chen, Yuhui Jovanov, Zarko P. Gao, Xiangwen Liu, Jingyuan Holc, Conrad Johnson, Lee R. Bruce, Peter G. High capacity surface route discharge at the potassium-O2 electrode |
| title | High capacity surface route discharge at the potassium-O2 electrode |
| title_full | High capacity surface route discharge at the potassium-O2 electrode |
| title_fullStr | High capacity surface route discharge at the potassium-O2 electrode |
| title_full_unstemmed | High capacity surface route discharge at the potassium-O2 electrode |
| title_short | High capacity surface route discharge at the potassium-O2 electrode |
| title_sort | high capacity surface route discharge at the potassium-o2 electrode |
| topic | Metal-air; Oxygen reduction |
| url | https://eprints.nottingham.ac.uk/50717/ https://eprints.nottingham.ac.uk/50717/ https://eprints.nottingham.ac.uk/50717/ |