Abstract
Ammonia (NH3) is a promising energy resource owing to its high hydrogen density. However, its widespread application is restricted by the lack of efficient and corrosion-resistant storage materials. Here, we report high NH3 adsorption in a series of robust metal-organic framework (MOF) materials, MFM-300(M) (M = Fe, V, Cr, In). MFM-300(M) (M = Fe, VIII, Cr) show fully reversible capacity for >20 cycles, reaching capacities of 16.1, 15.6, and 14.0 mmol g-1, respectively, at 273 K and 1 bar. Under the same conditions, MFM-300(VIV) exhibits the highest uptake among this series of MOFs of 17.3 mmol g-1. In situ neutron powder diffraction, single-crystal X-ray diffraction, and electron paramagnetic resonance spectroscopy confirm that the redox-active V center enables host-guest charge transfer, with VIV being reduced to VIII and NH3 being oxidized to hydrazine (N2H4). A combination of in situ inelastic neutron scattering and DFT modeling has revealed the binding dynamics of adsorbed NH3 within these MOFs to afford a comprehensive insight into the application of MOF materials to the adsorption and conversion of NH3.
Original language | English |
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Pages (from-to) | 3153-3161 |
Number of pages | 9 |
Journal | Journal of the American Chemical Society |
Volume | 143 |
Issue number | 8 |
DOIs | |
State | Published - Mar 3 2021 |
Funding
We thank EPSRC (EP/I011870), the Royal Society, and University of Manchester. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 742401, NANOCHEM). We are grateful to Diamond Light Source and STFC/ISIS Facility for access to Beamlines B22 (SM23782) and TOSCA/WISH, respectively, and to Oak Ridge National Laboratory for access to the VISION spectrometer at the Spallation Neutron Source, a DOE Office of Science User Facility under Contract No. DE-AC0500OR22725 with UT Battelle, LLC. This research used resources of Beamlines 11.3.1 and 12.2.1 at the Advanced Light Source, which is a U.S. DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. The computing resources were made available through the VirtuES and the ICE-MAN projects, funded by Laboratory Directed Research and Development program and Compute and Data Environment for Science (CADES) at ORNL. J.L. thanks China Scholarship Council (CSC) for funding. A.M.S. is supported by a Royal Society Newton Fellowship. We thank the EPSRC National EPR Facility at the University of Manchester for support with the EPR measurements.
Funders | Funder number |
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Compute and Data Environment for Science | |
Office of Science | DE-AC0500OR22725, DE-AC02-05CH11231 |
Laboratory Directed Research and Development | |
Horizon 2020 Framework Programme | SM23782, 742401 |
Royal Society | |
European Research Council | |
China Scholarship Council |