Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage

Bengisu Yilmaz; Behiye Yüksel; Gökhan Orhan; Devrim Aydin; Zafer Utlu

doi:10.1007/s12613-019-1890-x

Volume 27 Issue 1

Jan. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(1): 112-118

Bengisu Yilmaz, Behiye Yüksel, Gökhan Orhan, Devrim Aydin, and Zafer Utlu, Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 112-118. https://doi.org/10.1007/s12613-019-1890-x

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Bengisu Yilmaz, Behiye Yüksel, Gökhan Orhan, Devrim Aydin, and Zafer Utlu, Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 112-118. https://doi.org/10.1007/s12613-019-1890-x

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Research Article

Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage

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Corresponding author:
Bengisu Yilmaz E-mail: bengisu.yilmaz93@gmail.com
Received: 25 March 2019; Revised: 31 July 2019; Accepted: 1 August 2019; Available online: 9 December 2019

Abstract

Abstract

Thermochemical heat storage (THS) systems have recently attracted a lot of attention in research and development. In this study, an anodic aluminum oxide (AAO) template, fabricated by a two-step anodization method, was used for the first time as the matrix material for a THS system. Different salts were studied as thermochemical materials for their suitability in low-grade heat storage application driven by solar energy for an open system. Compositions were prepared by absorbing CaCl₂, MgCl₂, LiCl, LiNO₃ and mixtures of these salts under a vacuum in an AAO matrix. Field Emission Scanning Electron Microscopy was used to examine the morphology of the produced AAO composites. Thermal energy storage capacities of the composites were characterized using a differential scanning calorimeter. Characterization analysis showed that anodized Al plates were suitable matrix materials for THS systems, and composite sorbent prepared with a 1:1 ratio LiCl/LiNO₃ salt mixture had the highest energy value among all composites, with an energy density of 468.1 kJ·kg⁻¹.
- thermal energy storage;
- salt impregnation;
- thermochemical heat storage;
- anodizing;
- salt in matrix

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