Synergetic effect of temperature and pressure on energetic and structural characteristics of {ZIF-8 + water} molecular spring.

Y. Grosu (1, 2) , G. Renaudin (1) , V. Eroshenko (2) , J.-M. Nedelec (1) , J.-P. E. Grolier (1)

1 ICCF - Institut de Chimie de Clermont-Ferrand
2 Laboratory of Thermomolecular Energetics, National Technical University of Ukraine “Kyiv Polytechnic Institute”, Kyiv

Metal–organic frameworks (MOFs) and particularly their subclass – Zeolite Imidazolate Frameworks (ZIFs) – are used for a variety of applications including particularly energy storage. Highly porous MOFs mixed with non-wetting liquids can be used to form molecular springs (MS) for efficient mechanical and thermal energy storage/transformation. In this paper by means of high-pressure calorimetry the energetic characteristics of {ZIF-8 + water} MS were investigated in wide temperature and pressure ranges. Unexpectedly XRD measurements show that the concomitant effects of temperature and pressure on {ZIF-8 + water} MS leads to an irreversible change of the ZIF-8 structure, transforming its symmetry from cubic to orthorhombic. Whereas, previous studies have demonstrated the stability of ZIF-8 under either high pressure or high temperature.

Domaines: Chimie

Y. Grosu, G. Renaudin, V. Eroshenko, J.-M. Nedelec, J.-P. E. Grolier. Synergetic effect of temperature and pressure on energetic and structural characteristics of {ZIF-8 + water} molecular spring.. Nanoscale, 2015, 7, pp.8803-8810. ⟨10.1039/C5NR01340B⟩. ⟨hal-01212096⟩