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Highly efficient proton conduction in the metal–organic framework material MFM-300(Cr)·SO4(H3O)2

DOI: 10.1021/jacs.2c04900 DOI Help

Authors: Jin Chen (The University of Manchester) , Qingqing Mei (The University of Manchester) , Yinlin Chen (The University of Manchester) , Christopher Marsh (The University of Manchester) , Bing An (The University of Manchester) , Xue Han (The University of Manchester) , Ian P. Silverwood (ISIS Neutron and Muon Source) , Ming Li (University of Nottingham) , Yongqiang Cheng (Oak Ridge National Laboratory) , Meng He (The University of Manchester) , Xi Chen (The University of Manchester) , Weiyao Li (The University of Manchester) , Meredydd Kippax-Jones (The University of Manchester; Diamond Light Source) , Danielle Crawshaw (The University of Manchester) , Mark D. Frogley (Diamond Light Source) , Sarah J. Day (Diamond Light Source) , Victoria García-Sakai (ISIS Neutron and Muon Source) , Pascal Manuel (ISIS Neutron and Muon Source) , Anibal J. Ramirez-Cuesta (Oak Ridge National Laboratory) , Sihai Yang (The University of Manchester) , Martin Schroeder (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Chemical Society

State: Published (Approved)
Published: July 2022
Diamond Proposal Number(s): 29649

Open Access Open Access

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.

Journal Keywords: Activation energy; Diffusion; Materials; Metal organic frameworks; Proton conductivity

Diamond Keywords: Fuel Cells

Subject Areas: Chemistry, Materials, Energy

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy , I11-High Resolution Powder Diffraction

Other Facilities: IRIS/WISH at ISIS

Added On: 04/07/2022 08:21


Discipline Tags:

Energy Storage Earth Sciences & Environment Sustainable Energy Systems Energy Climate Change Chemistry Materials Science Metal-Organic Frameworks Metallurgy Organometallic Chemistry

Technical Tags:

Diffraction Spectroscopy X-ray Powder Diffraction Infrared Spectroscopy Lab-based Fourier Transform Infrared Spectroscopy (FTIR)