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Energies 2017, 10(1), 70; doi:10.3390/en10010070

Thermochemical Storage of Middle Temperature Wasted Heat by Functionalized C/Mg(OH)2 Hybrid Materials

1
National Interuniversity Consortium of Materials Science and Technology (INSTM), 50121 Florence, Italy
2
Department of Engineering, University of Messina, 98166 Messina, Italy
3
Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 152-8550, Japan
4
Department of Civil, Energetic, Environmental and Materials Engineering, Mediterranean University of Reggio Calabria, 89124 Reggio Calabria, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Francesco Calise
Received: 14 October 2016 / Revised: 22 December 2016 / Accepted: 29 December 2016 / Published: 10 January 2017
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Abstract

For the thermochemical performance implementation of Mg(OH)2 as a heat storage medium, several hybrid materials have been investigated. For this study, high-performance hybrid materials have been developed by exploiting the authors’ previous findings. Expanded graphite (EG)/carbon nanotubes (CNTs)-Mg(OH)2 hybrid materials have been prepared through Mg(OH)2 deposition-precipitation over functionalized, i.e., oxidized, or un-functionalized EG or CNTs. The heat storage performances of the carbon-based hybrid materials have been investigated through a laboratory-scale experimental simulation of the heat storage/release cycles, carried out by a thermogravimetric apparatus. This study offers a critical evaluation of the thermochemical performances of developed materials through their comparison in terms of heat storage and output capacities per mass and volume unit. It was demonstrated that both EG and CNTs improves the thermochemical performances of the storage medium in terms of reaction rate and conversion with respect to pure Mg(OH)2. With functionalized EG/CNTs-Mg(OH)2, (i) the potential heat storage and output capacities per mass unit of Mg(OH)2 have been completely exploited; and (ii) higher heat storage and output capacities per volume unit were obtained. That means, for technological applications, as smaller volume at equal stored/released heat. View Full-Text
Keywords: thermochemical storage; magnesium hydroxide; exfoliated graphite; graphene oxide; carbon nanotubes thermochemical storage; magnesium hydroxide; exfoliated graphite; graphene oxide; carbon nanotubes
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MDPI and ACS Style

Mastronardo, E.; Kato, Y.; Bonaccorsi, L.; Piperopoulos, E.; Milone, C. Thermochemical Storage of Middle Temperature Wasted Heat by Functionalized C/Mg(OH)2 Hybrid Materials. Energies 2017, 10, 70.

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