Jump to main content
Jump to site search


Design of Salt-Metal Organic Frameworks Composites for Seasonal Heat Storage Applications

Abstract

Porous materials are recognized as very promising materials for water-sorption-based energy storage and transformation.This study presents the first attempt to use Metal Organic Frameworks (MOFs) as host matrices of salts for the preparation of composite sorbents for seasonal heat storage. We have considered six water stable MOFs (i. e. MIL-127(Fe), MIL-100(Fe), MIL-101(Cr), UiO-66(Zr)-NH2, MIL-125(Ti)-NH2 and MIL-160(Al)) differing by their crystalline structure, hydrophilic-hydrophobic balance, pore size/shape and pore volume. The successful encapsulation of CaCl2 in the porosity of MOFs leads to two series of MOFs-CaCl2 composites whose salt content could be finely tuned depending on the pore volume of MOFs and the synthesis conditions. These materials were fully characterized by combining multiple techniques (i. e. powder X-ray diffraction, thermogravimetric analysis, scanning electron microcopy, X-ray energy-dispersive spectrometry elemental mapping, N2 sorption and elemental analysis). The water sorption properties of these composites were studied in conditions of a solar heat storage system (i. e. adsorption at 30°C, desorption at 80°C, both steps at a water vapour pressure of 12.5 mbar ) in comparison to the parental MOFs. We analyze how the physico-chemical and structural properties of these host matrices impact the energy density of composites sorbents. We show that two mesoporous MOFs-CaCl2 composites (i. e. MIL-100(Fe)/CaCl2 and MIL-101(Cr)/CaCl2 ) with the highest salt loading (46 and 62 wt% respectively), exhibit very high energy storage capacities (up to 310 kWh.m-3 (485 Wh.kg-1)) outperforming the best composites or physical sorbents reported so far together with very little losses upon adsorption-desorption cycling and high chemical stability upon ageing (up to 18 months).

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was accepted on 18 May 2017 and first published on 18 May 2017


Article type: Paper
DOI: 10.1039/C7TA03069J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Design of Salt-Metal Organic Frameworks Composites for Seasonal Heat Storage Applications

    A. Permyakova, S. Wang, E. Courbon, F. Nouar, N. Heymans, P. D'Ans, N. Barrier, P. Billemont, G. De Weireld, N. Steunou, M. Frère and C. Serre, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03069J

Search articles by author