Vijaya Kumar Saroja, Ajay Piriya;
Han, Yupei;
Nason, Charlie AF;
Sankar, Gopinathan;
He, Pan;
Lu, Yi;
Tinker, Henry R;
... Xu, Yang; + view all
(2024)
Cationic and Anionic Dual Redox Activity of MoS₂ for Electrochemical Potassium Storage.
ACS Materials Letters
, 6
(11)
pp. 5031-5038.
10.1021/acsmaterialslett.4c01455.
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Abstract
MoS₂ is regarded as one of the most promising potassium-ion battery (PIB) anodes. Despite the great progress to enhance its electrochemical performance, understanding of the electrochemical mechanism to store K-ions in MoS₂ remains unclear. This work reports that the K storage process in MoS₂ follows a complex reaction pathway involving the conversion reactions of Mo and S, showing both cationic redox activity of Mo and anionic redox activity of S. The presence of dual redox activity, characterized in-depth through synchrotron X-ray absorption, X-ray photoelectron, Raman, and UV–vis spectroscopies, reveals that the irreversible Mo oxidation during the depotassiation process directs the reaction pathway toward S oxidation, which leads to the occurrence of K–S electrochemistry in the (de)potassiation process. Moreover, the dual reaction pathway can be adjusted by controlling the discharge depth at different cycling stages of MoS₂, realizing a long-term stable cycle life of MoS₂ as a PIB anode.
| Type: | Article |
|---|---|
| Title: | Cationic and Anionic Dual Redox Activity of MoS₂ for Electrochemical Potassium Storage |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsmaterialslett.4c01455 |
| Publisher version: | https://doi.org/10.1021/acsmaterialslett.4c01455 |
| Language: | English |
| Additional information: | © The Author(s), 2025. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Chemical structure, Electrodes, Oxidation, Potassium, Redox reactions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10216402 |
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