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Hydrogen and heat storage

The main research is the synthesis and characterization of new materials for the storage of hydrogen and heat. The focus is on complex aluminum hydride compounds, which are materials with high hydrogen storage capacities.

Metal hydrides can not only store high amounts of hydrogen, they have also the property to store huge amounts of heat. In this case hydrogen is only a process gas and not consumed during the heat storage or release.

Light weight metal hydrides based on magnesium can be used as heat storage materials at temperatures up to 550°C. Therefore they can store huge amounts of heat for e.g. solar thermal power plants. Over the daytime the high temperature metal hydride is decomposed through solar heat and releases hydrogen. The hydrogen is temporarily stored in a gas tank or in a low temperature metal hydride. During the night the stored heat can be recovered from the reaction of the magnesium metal with hydrogen. Our aim is the optimization and demonstration of heat storage units and materials for this application.

High-energy ball milling, mechano catalysis

The synthesis of organic and inorganic compounds can often be simplified through mechanical activation. Solvents are not necessary, the reaction time is often reduced and completely unknown compounds can be synthesized. Reactions under gas pressure (up to 300 bar) can be done directly in a ball mill with in-situ observation of the reaction conditions by a telemetric data logging system.

1. Schreyer, H.; Eckert, R.; Immohr, S.; de Bellis, J.; Felderhoff, M.; Schüth, F. Milling down to nanometers: A general direct process for the direct synthesis of supported metal catalysts. Angew. Chem. Int. Ed. 2019, 58, 11262–11265.
2. Ortmeyer, J.; Bodach, A.; Sandig-Predzymirska, L.; Zibrowius, B.; Mertens, F.; Felderhoff, M. Direct Hydrogenation of Aluminum via Stabilization with Triethylenediamine: A Mechanochemical Approach to Synthesize the Triethylenediamine AlH₃ Adduct. ChemPhysChem. 2019, 20, 1360–1368. Immohr, S.; Felderhoff, M.; Weidenthaler, C.; Schüth, F. Orders-of-magnitude rate enhancement in solid-catalyzed CO-oxidation by in-situ ball milling. Angew. Chem. Int. Ed. 2013, 125, 12920–12923.
3. Shao, H.; Felderhoff, M.; Schüth, F. Hydrogen storage properties of nanostructured MgH2/TiH2 composite prepared by ball milling under high hydrogen pressure. Int. J. Hydrogen Energy 2011, 36, 10828–10833.
4. Bellosta von Colbe, J. M.; Felderhoff, M.; Bogdanović, B.; Schüth, F.; Weidenthaler, C. One-step direct synthesis of a Ti-doped sodium alanate hydrogen storage material. Chem. Commun. 2005, 4732–4734.

1. Zhong, H.; Ouyang, L.; Zeng, M.; Liu, J.; Wang, H.; Shao, H.; Felderhoff, M.; Zhu, M. Realizing Facile Regeneration of spent NaBH4 with Mg-Al Alloy. J. Mater. Chem. A 2019, 7, 10723–10728.
2. Ley, M. B.; Bernert, T.; Ruiz-Fuertes, J.; Goddard, R.; Fares, C.; Weidenthaler, C.; Felderhoff, M. The plastic crystalline A15 phase of dimethylaminoalane, [N(CH3)2– AlH2]3. Chem. Commun. 2016, 52, 11649–11652.
3. Urbanczyk, R.; Meggouh, M.; Moury, R.; Peinecke, K.; Peil, S.; Felderhoff, M. Demonstration of Mg2FeH6 as heat storage material at temperatures up to 550 °C. Appl. Phys. A, 2016, 122(4).
4. Urbanczyk, R.; Peil, S.; Bathen, D.; Heßke, C.; Burfeind, J.; Hauschild, K.; Felderhoff, M.; Schüth, F. HT-PEM fuel cell system with integrated complex hydride storage tank. Fuel Cells 2011, 11, 911–920.
5. Bogdanović, B.; Felderhoff, M.; Kaskel, S.; Pommerin, A.; Schlichte, K.; Schüth, F. Improved hydrogen storage properties of Ti-doped sodium alanate using titanium nanoparticles as doping agents. Adv. Mater. 2003, 15, 1012.

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