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D. Müller, C. Knoll, Jan Welch, A. Werner, M. Harasek, C. Schnabl, P. Weinberger:
"Thermochemical energy storage materials for combination with solar thermal collector systems";
Talk: ACS Spring Meeting 2019, Orlando; 2019-03-31 - 2019-04-04; in: "Chemistry for New Frontiers", American Chemical Society (ed.); (2019), ISBN: 978-0-8412-3433-8; Paper ID 895, 1 pages.

The sun as energy source suffers from a temporal mismatch between energy production and consumption. The development of efficient heat storage concepts allows for a temporal shift, utilizing excess heat collected in times of high availability / low demand during times of low availability / high demand.
In solar thermal systems exists huge potential for storage of excess heat harvested during high-production phases for consumption during low radiation periods. Thermochemical energy storage (TCES) - featuring high storage densities, variable temperature levels and the potential of miniaturizing storage systems - is a highly promising concept for this challenge. So far, neither suitable TCES-materials, nor a prototype-setup compatible with temperatures below 400 °C, provided by many solar thermal collector systems, was at hand. With the development of the [Cu(NH₃)₄]SO₄ / CuSO₄ TCES-system a perfectly cycle stable, fast-reacting system featuring a storage density of 1.77 GJ m^-3 and allowing for a temperature increase within 20 seconds from 25 °C to over 300 °C, was identified.
We present our way from the material development in the lab, a detailed understanding of the materials properties and potential, to a first (100 g scale) and a second prototype-phase (3 kg scale), leading to the conception of a prototype on a 1 m³ scale for combination with a solar thermal collector system.

thermochemical energy storage; ammoniates; prototype