When Polymorphism in Metal-Organic Frameworks Enables Water Sorption Profile Tunability for Enhancing Heat Allocation and Water Harvesting Performance

Tobie Matemb Ma Ntep (1) , Mohammad Wahiduzzaman (2) , Eric Laurenz (3) , Ieuan Cornu (4) , Georges Mouchaham (1) , Iurii Dovgaliuk (1) , Shyamapada Nandi (1) , Klaus Knop (5) , Christian Jansen (5) , Farid Nouar (1) , Pierre Florian (4) , Gerrit Füldner (3) , Guillaume Maurin (2) , Christoph Janiak (5) , Christian Serre (1)

1 IMAP - Institut des Matériaux Poreux de Paris
2 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
3 Fraunhofer ISE - Fraunhofer Institute for Solar Energy Systems
4 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
5 Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf]

Abstract The development of thermally driven water‐sorption‐based technologies relies on high‐performing water vapor adsorbents. Here, polymorphism in Al–metal–organic frameworks is disclosed as a new strategy to tune the hydrophilicity of MOFs. This involves the formation of MOFs built from chains of either trans ‐ or cis ‐ µ‐OH‐connected corner‐sharing AlO 4 (OH) 2 octahedra. Specifically, [Al(OH)(muc)] or MIP‐211, is made of trans , trans ‐muconate linkers, and cis ‐µ‐OH‐connected corner‐sharing AlO 4 (OH) 2 octahedra giving a 3D network with sinusoidal channels. The polymorph MIL‐53‐muc has a tiny change in the chain structure that results in a shift of the step position of the water isotherm from P / P 0 ≈ 0.5 in MIL‐53‐muc, to P / P 0 ≈ 0.3 in MIP‐211. Solid‐state NMR and Grand Canonical Monte Carlo reveal that the adsorption occurs initially between two hydroxyl groups of the chains, favored by the cis ‐positioning in MIP‐211, resulting in a more hydrophilic behavior. Finally, theoretical evaluations show that MIP‐211 would allow achieving a coefficient of performance for cooling (COPc) of 0.63 with an ultralow driving temperature of 60 °C, outperforming benchmark sorbents for small temperature lifts. Combined with its high stability, easy regeneration, huge water uptake capacity, green synthesis, MIP‐211 is among the best adsorbents for adsorption‐driven air conditioning and water harvesting from the air.

Mots clés: Metal-Organic Frameworks polymorphism hydrophilicity water sorption adsorptiondriven cooling water harvesting; Metal-Organic Frameworks; polymorphism; hydrophilicity; water sorption; adsorptiondriven cooling; water harvesting

Domaines: Chimie

Tobie Matemb Ma Ntep, Mohammad Wahiduzzaman, Eric Laurenz, Ieuan Cornu, Georges Mouchaham, et al.. When Polymorphism in Metal-Organic Frameworks Enables Water Sorption Profile Tunability for Enhancing Heat Allocation and Water Harvesting Performance. Advanced Materials, 2023, ⟨10.1002/adma.202211302⟩. ⟨hal-04304078⟩