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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Enhanced ion intercalation in NixK1-2xTiNbO5 enabled by redox active Ni exchange for potassium-ion batteries Charlie A. F. Nason , Ajay Piriya Vijaya Kumar Saroja , Wanjun Ren , Yingkangzi Mei , Asma Sarguroh , Yupei Han , Yi Lu , Jamie A. Gould , Tim I. Hyde , Veronica Celorrio , Gopinathan Sankar , Yang Xu Chemical Science 5 DOI: 10.1039/D5SC04984A Diamond Proposal Number(s): [39009, 39790] Open Access Show Abstract ▼ Abstract: The ultimate goal of potassium-ion batteries (KIBs) is to become a serious competitor to lithium-ion batteries (LIBs). Achieving this requires the development of high energy density negative electrode materials, with transition metal oxides emerging as the most promising candidates. However, despite their high theoretical capacities, most transition metal oxides still struggle to achieve high performance, often necessitating substantial nanostructuring. Ion-exchange presents a facile and effective process for enhancing material properties, yet the demonstration of the exchanged ions undergoing redox activity has not been previously reported for KIBs. Herein, this work reports Ni0.25K0.5TiNbO5, synthesized through the ion-exchange between K+ and Ni2+, as a novel negative electrode material for KIBs. The ion-exchanged material achieves a specific capacity of 304 mAh g−1 in the first cycle and 162 mAh g−1 after 10 cycles, corresponding to a 240% and 156% increase compared to the pristine, unexchanged KTiNbO5 at the same cycle numbers. The structure–performance relationship was investigated in detail, shedding light on the previously unknown relationships between the level of hydration, degree of exchange and the performance of ion-exchanged materials. Furthermore, the exchanged Ni was demonstrated to be reversibly redox active, contributing to the observed capacity and representing a first for ion-exchanged materials in the KIB literature.	Sep 2025
B18-Core EXAFS	Cationic and anionic dual redox activity of MoS2 for electrochemical potassium storage 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 Acs Materials Letters DOI: 10.1021/acsmaterialslett.4c01455 Diamond Proposal Number(s): [30102] Open Access Show Abstract ▼ 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.	Oct 2024

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