Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第1期
论文作者：Bengisu Yilmaz G?khan Orhan Devrim Aydin
文章页码：112 - 118
摘 要：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 k J·kg-1.
Bengisu Yilmaz1，G?khan Orhan1，Devrim Aydin3
1. Istanbul University-Cerrahpasa, Faculty of Engineering, Department of Metallurgy and Materials Engineering3. Eastern Mediterranean University, Faculty of Engineering, Department of Mechanical Engineering
摘 要：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 k J·kg-1.
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