JOURNAL: Development and characterisation of an alginate and expanded graphite based composite for thermochemical heat storage

Summary

Authors:

Jack Reynolds
Rhodri Williams
Jonathon Elvins
Eifion Jewell
Justin Searle
Xinyuan Ke

Swansea University
University of Bath

Development and characterisation of an alginate and expanded graphite based composite for thermochemical heat storage

Journal of Materials Science

March 2023

This study introduces an innovative approach to thermochemical heat storage, a technology used to store heat from solar thermal energy or industrial waste heat. The study presents a novel expanded graphite/alginate polymer matrix encapsulated with hydrated salts as highly efficient for heat storage material. This material can be sized and shaped to suit various applications and scaled up as needed. Through reversible hydration and dehydration reactions, the incorporated CaCl2 salt can store and release heat. The results indicate that this novel composite material offers better packing density and comparable energy density when compared to conventional materials, such as vermiculite/CaCl2 composites. Moreover, it exhibits higher thermal conductivity, enhancing energy efficiency for a range of applications, from solar thermal generators to low-grade waste heat sources.