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Cationic and Anionic Dual Redox Activity of MoS 2 for Electrochemical Potassium Storage

Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide MoS 2 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 MoS 2 remains unclear. This work reports that the K storage process in MoS 2 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 MoS 2, realizing a long-term stable cycle life of MoS 2 as a PIB anode.
DOI: 10.1021/acsmaterialslett.4c01455
Authors: Ajay Piriya Vijaya Kumar Saroja, Yupei Han, Charlie A. F. Nason, Gopinathan Sankar, Pan He, Yi Lu, Henry R. Tinker, Andrew Stewart, Veronica Celorrio, Min Zhou, Jiayan Luo, Yang Xu
Institutions: University College London, Diamond Light Source, Research Complex at Harwell, University of Science and Technology of China, Shanghai Jiao Tong University, State Key Laboratory of Metal Matrix Composites
Language: English
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G115536391, G3357610121, G3556805555, G3983327421, "Free-from": transition metal-free and anode-free potassium batteries, G4104417022, G5951333824, Vacancy Engineering in Anode Materials for High-Power K-Ion Batteries, G745210415
OpenAlex ID: W4403280319
FWCI: 1.129
Cites: 54
Cited by: 11
Related to: 10