Regarding the former, Fedunik-Hofman et al. In the case of thermochemical energy storage, contributions covered both carbonate and redox-based systems, which are amongst the most promising. The authors assessed the thermophysical properties of these alloys which showed reversible phase transitions for 20 cycles, with a latent heat at 644☌ of 232.8 kJ kg −1. These PCM alloys, with varying the Cu-Ge ratio, showed chemical compatibility with alumina or SiC containers, albeit not with stainless steel or Inconel tanks.
reported on the use of copper-germanium alloys as phase-change materials (PCMs) for high-temperature latent heat storage. Regarding thermal energy storage, both latent and thermochemical technologies have been addressed. The published contributions cover several key aspects for the progress of these technologies, e.g., storage media and reactors development, computational tools for the discovery of new materials and techno-economic assessment of thermochemical energy storage (TCS) units. This Research Topic focuses on the recent advances both in thermal energy storage and in thermochemical cycles for hydrogen production. These renewable fuels can be used for industry and transportation or as precursors for liquid fuels or chemicals. In addition, the high temperatures achieved in concentrated solar thermal (CST) plants based on cavity receiver, with heliostat field or dish concentrators, can be used to drive the thermal reduction of metal oxides than can be subsequently re-oxidized with steam and/or CO 2 producing H 2 or syngas, respectively. In this respect, concentrated solar power (CSP) plants incorporate thermal energy storage (TES) units that allows for a round-the-clock electricity production and are radically cheaper than other storage solutions such as batteries (Carrillo et al., 2019 Bayon et al., 2021). Therefore, development of efficient and cost-effective energy storage technologies is fundamental for the implementation of solar energy worldwide. However, solar energy radiation is not equally distributed along the planet surface and it suffers from an inherent intermittence problem. Among them, solar energy shows great potential since 430 EJ per hour of sunlight energy hit the Earth, which is about the annual world energy consumption (Lewis and Nocera, 2006). Renewable energies are the core of the transition to a decarbonized and more sustainable energy sector. The observed heat storage capacity, thermal stability, and good reversibility after dehydration–hydration cycles highlight the potential of this class of materials, thus opening new research paths for the development and investigation of innovative organic salt hydrates.
Its heat storage capacity, so far unknown, was measured to be ~595.2 kJ/kg (or ~278.6 kWh/m3). No deliquescence phenomena occurred upon exposure to a relative humidity (RH) between 10 and 100%. The material can operate in the temperature range of 30–150 ☌, suitable for TCS. The thermal behavior of CaHS, in terms of stability and dehydration–hydration cyclability, was assessed. The CaHS was prepared by precipitation from the water-soluble disodium triaxone. The organic model compound chosen in this study was calcium 7-amino]-3-8-oxo-5-thia-1-azabicyclooct-2-ene-2-carboxylate, known as calcium ceftriaxone, hereafter named CaHS (calcium hydrated salt), a water-insoluble organic salt, which can combine up to seven water molecules. We here proposed and investigated, for the first time, the possibility of using organic salt hydrates as a paradigm for novel TCS materials with low water solubility, that is, more resistance to deliquescence, a tendency to coordinate a high number of water molecules and stability under operating conditions. One of the drawbacks that researchers face when studying this class of materials is their tendency to undergo deliquescence phenomena. The use of inorganic salt hydrates for thermochemical energy storage (TCS) applications is widely investigated.
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