Thermochemical Energy Storage System based on Calcium Hydroxide and Metal Organic Frameworks

Abstract

The exploitation of solar energy, a limitless and clean energy resource, is of foremost significance in enhancing the utilization of renewable energy sources to replace the utilization of fossil fuels. Due to their intrinsic intermittent and fluctuation, a significant amount of solar energy and waste from industry heat is unable to be processed or utilized effectively. This work aims to build a system connecting the variation between demand and availability by storing excessive amounts of heat more efficiently. Thermochemical energy storage is an intriguing contender because of its substantial energy densities and the potential of storing heat energy for extended periods in recovering waste heat and renewable energy consumption. Calcium hydroxide is a intriguing material for thermochemical energy storage systems because of its abundance and ecological compatibility. However, certain potential limitations to pure Ca(OH)2 powder could limit its performance, particularly low thermal conductivity, and agglomeration during cycles of dehydration and rehydration. This research investigated a novel composite material utilizing a cobalt BDC metal-organic framework. In this work, calcium hydroxide nanoparticles were synthesized using the sol-gel technique. Co-BDC MOF is utilized as a self-sacrificing template and precursor material. Through heat treatment at 800 ◦C, the Co-BDC MOF would progressively transform to cobalt oxide in the existence of calcium hydroxide nanoparticles. The morphological and structural characteristics were identified by executing X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Thermogravimetric analysis and differential scanning calorimetry examine the kinetics, cycling stability, and thermodynamics of pure calcium hydroxide and composite materials.