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Water Harvesting at the Single-Crystal Level.
Fuchs, Adrian; Knechtel, Fabian; Wang, Haoze; Ji, Zhe; Wuttke, Stefan; Yaghi, Omar M; Ploetz, Evelyn.
Affiliation
  • Fuchs A; Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 Munich, Germany.
  • Knechtel F; Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 Munich, Germany.
  • Wang H; Department of Chemistry and Kavli Energy Nanoscience Institute, University of California-Berkeley, Berkeley, California 94720, United States.
  • Ji Z; Department of Chemistry and Kavli Energy Nanoscience Institute, University of California-Berkeley, Berkeley, California 94720, United States.
  • Wuttke S; BCMaterials, Basque Center for Materials, UPV/EHU Science Park, 48940 Leioa, Spain.
  • Yaghi OM; Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
  • Ploetz E; Department of Chemistry and Kavli Energy Nanoscience Institute, University of California-Berkeley, Berkeley, California 94720, United States.
J Am Chem Soc ; 145(26): 14324-14334, 2023 Jul 05.
Article in En | MEDLINE | ID: mdl-37353221
Metal-organic frameworks (MOFs) have emerged as a class of porous materials with facile uptake and release of water, turning them into excellent substrates for real-world atmospheric water harvesting applications. The performance of different MOF systems was experimentally characterized at the bulk level by assessing the total amount of water taken up and the release kinetics, leaving the question behind of what the upper limit of the pristine materials actually is. Moreover, recent devices rely on fluidized bed reactors that exploit the harvesting capacities of MOFs at the single-crystal (SC) level. In this publication, we present a novel methodology based on Raman spectroscopy, for acquiring water adsorption isotherms and kinetic curves with a sub-micrometer resolution that provides valuable insights into the material behavior probing the pristine MOF at the SC level. We investigated isolated MOF-801 particles in situ and could dissect contributions of intra- and inter-particle effects on the water harvesting performance of MOF-801 via adsorption-desorption isotherms and kinetic curves. Using spontaneous Raman spectroscopy, we found an almost 20-fold faster uptake for the undisturbed crystalline material. Correlative imaging based on four-wave mixing and coherent anti-Stokes Raman scattering further localized the uptaken water inside MOF-801 and identified inter-particle condensation as the main source for the discrepancies between the performance at the bulk and SC level. Our studies determined an upper limit of around 91.9 L/kgMOF/day for MOF-801.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Am Chem Soc Year: 2023 Document type: Article Affiliation country: Germany Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Am Chem Soc Year: 2023 Document type: Article Affiliation country: Germany Country of publication: United States