Small-Angle Neutron Scattering Characterization of SrCl2-ENG Composite for Thermochemical Heat Storage

Published

July 28, 2021

Author(s)

Anastasiia Karabanova, Kenneth D. Knudsen, Perizat Berdiyeva, Leide P. Cavalcanti, Yun Liu, Michel van der Pal, Stefano Deledda, Didier Blanchard

Abstract

This work presents an in-situ nanoscale structural characterization of the composite material SrCl₂-Expanded Natural Graphite (ENG) during ammonia absorption and desorption, using small angle neutron scattering (SANS) together with X-ray powder diffraction and sorption measurements. For the processing of the composite material SANS patterns, we developed and implemented two methods, which showed comparable results. The study allowed following the evolution of the SrCl₂ particles and the nanopores inside the particles during five sorption cycles. The structural changes were compared to the absorption and desorption kinetic measurements, allowing to make qualitative analysis of the impact of the structural changes on the material properties, such as thermal conductivity and permeability. It was shown that the structural evolution of the composite material did not affect the desorption rate but significantly influenced the absorption rate after the first cycle. We also observed a significant improvement of absorption kinetics due to the formation of nanopores in the fully deammoniated sample. In addition, the ENG matrix was shown to hinder the agglomeration of the SrCl₂ particles during sorption processes, which is in contrast to the results for the metal halide reported before.

Citation

ACS Applied Materials and Interfaces

Volume

13

Issue

29

Pub Type

Journals

Keywords

small angle neutron scattering, heat storage, graphite, ammonia, adsorption

Citation

Karabanova, A. , Knudsen, K. , Berdiyeva, P. , Cavalcanti, L. , Liu, Y. , van der Pal, M. , Deledda, S. and Blanchard, D. (2021), Small-Angle Neutron Scattering Characterization of SrCl₂-ENG Composite for Thermochemical Heat Storage, ACS Applied Materials and Interfaces (Accessed April 19, 2024)