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B22-Multimode InfraRed imaging And Microspectroscopy I11-High Resolution Powder Diffraction	Highly efficient proton conduction in the metal–organic framework material MFM-300(Cr)·SO4(H3O)2 Jin Chen , Qingqing Mei , Yinlin Chen , Christopher Marsh , Bing An , Xue Han , Ian P. Silverwood , Ming Li , Yongqiang Cheng , Meng He , Xi Chen , Weiyao Li , Meredydd Kippax-Jones , Danielle Crawshaw , Mark D. Frogley , Sarah J. Day , Victoria García-Sakai , Pascal Manuel , Anibal J. Ramirez-Cuesta , Sihai Yang , Martin Schroeder Journal Of The American Chemical Society DOI: 10.1021/jacs.2c04900 Diamond Proposal Number(s): [29649] Open Access Show Abstract ▼ Abstract: The development of materials showing rapid proton conduction with a low activation energy and stable performance over a wide temperature range is an important and challenging line of research. Here, we report confinement of sulfuric acid within porous MFM-300(Cr) to give MFM-300(Cr)·SO4(H3O)2, which exhibits a record-low activation energy of 0.04 eV, resulting in stable proton conductivity between 25 and 80 °C of >10–2 S cm–1. In situ synchrotron X-ray powder diffraction (SXPD), neutron powder diffraction (NPD), quasielastic neutron scattering (QENS), and molecular dynamics (MD) simulation reveal the pathways of proton transport and the molecular mechanism of proton diffusion within the pores. Confined sulfuric acid species together with adsorbed water molecules play a critical role in promoting the proton transfer through this robust network to afford a material in which proton conductivity is almost temperature-independent.	Jul 2022

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