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Instruments / Technical Area	Publication Details	Published	Actions
B07-B1-Versatile Soft X-ray beamline: High Throughput ES1 B18-Core EXAFS E01-JEM ARM 200CF E02-JEM ARM 300CF	Highly stable manganese oxide cathode material enabled by Grotthuss topochemistry for aqueous zinc ion batteries Fangjia Zhao , Jianwei Li , Arunabhiram Chutia , Longxiang Liu , Liqun Kang , Feili Lai , Haobo Dong , Xuan Gao , Yeshu Tan , Tianxi Liu , Ivan P. Parkin , Guanjie He Energy & Environmental Science 22 DOI: 10.1039/D3EE04161A Diamond Proposal Number(s): [32905, 29340, 32058] Open Access Show Abstract ▼ Abstract: The design and synthesis of manganese oxide-based materials with high-rate performance and long cycle life is a major challenge for aqueous zinc-ion batteries (AZIBs). This research reports the presence of a synergistic collaboration between vacancies, lattice water and nickel ions on enhancing the hydrated protons hopping via the Grotthuss mechanism for high-performance zinc ion batteries. The Grotthuss mechanism allows for the efficient transfer of a proton charge without the actual movement of the molecule over long distances, resulting in high ionic conductivity. NiMn3O7·3H2O achieves a capacity of 318 mA h g−1 under 200 mA g−1 and 121 mA h g−1 under 5 A g−1 with a retention of 91% after 4000 cycles. The relationship between the remarkable performance and Grotthuss topochemistry is investigated using techniques including synchrotron X-ray absorption spectroscopy and density functional theory. Protons prefer to bond with O2− ions on the Mn–O layer, and proton transfer is favoured in the presence of vacancies. The continuous hopping of protons within the host material induces periodic, temporary local structural changes in the lattice. This dynamic behaviour alters the energy barriers for ions intercalation and deintercalation. Nickel ions facilitate the ongoing mobility of hydrated protons via Grotthuss hopping by preserving the system's electrical neutrality, which counterbalances the dynamic changes caused by proton migration. This study provides insight into the Grotthuss conduction mechanism for the development of high-performance cathode materials in AZIBs.	Jan 2024

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B07-B1-Versatile Soft X-ray beamline: High Throughput ES1
B18-Core EXAFS
E01-JEM ARM 200CF
E02-JEM ARM 300CF

Highly stable manganese oxide cathode material enabled by Grotthuss topochemistry for aqueous zinc ion batteries