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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access November 20, 2014

Preparation of Nano-Composite Ca2αZnα(OH)4 with High Thermal Storage Capacity and Improved Recovery of Stored Heat Energy

  • M. Zheng EMAIL logo , S.M. Sun , J. Hu , Y. Zhao and L. J. Yu
From the journal Open Engineering


Thermal energy storage has very important prospects in many applications related to the use of renewable energies (solar energy, etc.) or other energy sources, such as waste heat from industrial processes. Thermochemical storage is very attractive for long-term storage, since it could be conducted at room temperature without energy losses. In the present paper, a novel nanocomposite material, Ca2αZnα(OH)4, is prepared using coprecipitation methodology and is characterized by XRD and DSC tests. The XRD result shows that the grain size of the nano-composite ranges from 40 nm to 95 nm. The DSC test result shows that the nano-composite exhibits high thermal storage capacity: 764.5 J/g at α = 0.8555. Its thermal decomposition temperature was found to be approximately 180º. Itwas found possible to recover 63.25% of the stored heat energy.


[1] Jaume C.G., Albert C., Luisa F.C., Thermo-chemical energy storage and conversion: A-state-of-the-art review of the experimental research under practical conditions, Renewable and Sustainable Energy Reviews 16, 2012, 5207–5224. [2] Meng X.Y., Bao Z.W., Yang F.S., Theoretical investigation of solar energy high temperature heat storage technology based on metal hydrides, Inter. J. of Air-Conditioning & Refr. 19, 2012, 1- 10. [3] Wang K., Wu J.Y., Wang R.Z., Wang L.W., Effective thermal conductivity of expanded graphite-CaCl2 composited sorbent for chemical adsorption chillers, Energy Conversion and Management 47, 2006, 1902–1912. [4] Abhat A., Huy T.Q., Heat and mass-transfer considerations in a thermo-chemical energy-storage system based on solid-gas reactions, Solar Energy 30, 1983, 93–98. [5] Han J.H., Lee K.H., Gas permeability of expanded graphitemetallic salt composite, Applied Thermal Engineering 21, 2001, 453–63. [6] Gordeeva L.G., Aristov Y.I., Composites “salt inside porousmatrix” for adsorption heat transformation: a current state-of-theart and new trends, Inter. J. of Low-Carbon Tech. 8, 2012, 1–15. [7] Schaube F., Koch L., Woerner A.,Mueller-Steinhagen H., A thermodynamic and kinetic study of the de- and rehydration of Ca(OH)2, Thermochimica Acta 538, 2012, 9-20. [8] Kim S. T., Ryu J., Kato Y., Optimization of Mg(OH)2 composite material mixed with expanded graphite and calcium chloride for chemical heat pumps, Appl. Thermal Eng. 50, 2013, 485- 490. [9] Shkatulov A., Ryu J., Kato Y., Aristov Y., Composite material “Mg(OH)2/ vermiculite”: A promising new candidate for storage of middle temperature heat, Energy 44, 2012, 1028-1034. [10] Ishitobi H., Uruma K., Takeuchi M., Ryu J., Kato J., Dehydration and hydration behavior of metal salt modified materials for chemical heat pumps, Applied Thermal Engineering 50, 2013, 1639-1644. [11] Kato Y., Takahashi R., Sekiguchi T., Ryu J., Study on mediumtemperature chemical heat storage using mixed hydroxides, International Journal of Refrigeration 32, 2009, 661–666. [12] Ryu J., Takahashi R., Kato Y., Effect of transition metal mixing on reactivities of magnesium oxide for chemical heat pump, Journal of Chemical Engineering of Japan 40, 2007, 1281-1286. [13] Azpiazu M.N., Morquillas J.M., Vazquez A., Heat recovery from a thermal energy storage based on the Ca(OH)2/CaO cycle, Applied Thermal Engineering 23, 2003, 733–741. Search in Google Scholar

Received: 2014-5-25
Accepted: 2014-8-28
Published Online: 2014-11-20

©2015 M. Zheng et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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