Document Type : Research Paper

Authors

Department of Metallurgy and Materials, Hamedan University of Technology, Hamedan, Iran

Abstract

In this research, Co3O4-5 wt.% Al2O3 composite was prepared by two different methods including milling of oxide mixtures (first method) and mixing of pre- milled cobalt oxide and iron oxide (second method). Then, particle morphology, average particle size, Al2O3 distribution, and thermal energy storage capacity were investigated by Field Emission Scanning Electron Microscopy (FE-SEM) , Energy Dispersive X-ray Spectroscopy (EDS), and Thermal Gravimetric Analysis (TGA) methods. The results showed that samples prepared by first method during short milling time (less than one hour), generally showed better energy storage capacity (equivalent to 2 wt. % of O2 storage) than the samples prepared by second method in the short milling time(equivalent to 1-1.5 wt. % of O2 storage). It was while that samples prepared in long milling time (16 h) by second method had higher energy storage capacity (equivalent to 2-6 wt. % of O2 storage) than samples prepared by first method (equivalent to 2 wt. % of O2 storage) in similar ball milling time. Among the samples prepared by second method, the samples prepared by 16-h milled cobalt oxide showed better redox behavior than the other samples. It was also found that reducing the particle size of the composite powder (reducing the diffusion distance of oxygen atoms) is not necessarily accompanied by improved thermal energy storage capacity.

Keywords

[1] Mahlia, T. M. I., Saktisahdan, T. J., Jannifar, A., Hasan, M. H., Matseelar, H.S.C., "A Review of Available Methods and Development on Energy Storage; Technology Update", Renew Sustain Energy Rev,; Vol.33, pp. 532-454, 2014.
[2] Pardo, P., Deydier, A., Anxionnaz-Minvielle, Z., Rougé, S., Cabassud, M., Cognet, P., "A Review on High Temperature Thermochemical Heat Energy Storage", Renew Sustain Energy Rev; Vol. 32, pp.591–610, 2014.
[3] Yan, T., Wang, R. Z., Li, T. X., Wang, L. W., Fred, I. T., "A Review of Promising Candidate Reactions for Chemical Heat Storage", Renew Sustain Energy Rev, Vol. 43, pp.13-31, 2015.
[4] Abedini, H., "A Critical Review of Thermochemical Energy Storage," The open Renewable Energy, Vol. 4, pp. 42-46, 2011.
[5] Aydin, D., Casey, S. P., Riffat, S., "The Latest Advancements on Thermochemical Heat Storage Systems", Renew Sustain Energy Rev, Vol. 41, pp.356-367, 2015.
[6] Agrafiotis, C., "Exploitation of Thermochemical Cycles Based on Solid Oxide Redox Systems for Thermochemical Storage of Solar Heat ", Solar Energy, Vol. 114, pp. 440-458, 2015.
[7] Carrillo, A., "Thermochemical Energy Storage at High Temperature via Redox Cycles of Mn and Co Oxides", Solar Energy & Solar Cells, Vol. 123, pp. 47-57, 2014.
[8] U.S.Department of Energy, "Thermochemical heat storage for concentrated solar power", General atomic project 2011; GA-C27137.
[9] Alexander, P., Andrew, J., Peter, G., "Solar Electricity via an Air Brayton Cycle with an Integrated two-step Thermochemical Cycle for Heat Storage Based on Co3O4/CoO Redox Reactions II: Kinetic Analyses", Solar Energy, Vol.122, pp. 409-418, 2015.
[10] Block, T., Knoblauch, N., Schmucker, M., "The Cobalt-oxide/iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material", Thermochemical Acta, Vol. 577, pp. 25-32, 2014.
[11] Hutchings, K., Wilson, M., Larsen, P., Raymnd, C., "Kinetic and Thermodynamic Considerations for Oxygen Absorption/Desorption Using Cobalt Oxide", Solid State Ionics, Vol. 177, pp. 45-41, 2006.
[12] Neises, M., "Solar heated rotary kiln for thermochemical energy storage", Solar Energy, Vol. 86, pp.3040-3048, 2014.
[13] Nekokar, N., Pourabdoli, M., Ghaderi Hamidi, A., "Effects of Fe2O3 Addition and Mechanical Activation on Thermochemical Heat Storage Properties of the Co3O4/CoO System", Journal of Particle Science and Technology, Vol. 4, pp.13-22, 2018.
[14] Nekokar,  N., Pourabdoli, M., Ghaderi Hamidi, A., "Effect of Mechanical Activation on Thermal Energy Storage of Co3O4/CoO  System",  Advanced  powder Technology, Vol. 2, No. 29, pp. 333-340, 2017.
[15] Hasanvand, A., Pourabdoli, M., Ghaderi Hamidi, A., "Thermochemical Heat Storage Properties of Mechanical Activated Co3O4-5 wt. % Al2O3 and Co3O4-5 wt. % Y2O3 Ccomposite Powders,  Iranian Journal of Materials Science and Engineering, Vol. 16, pp. x-x, 2020 (In press).
[16] Hasanvand, A., Pourabdoli, M., Theoretical Thermodynamics and Practical Studies of Oxygen Desorption from Co3O4-5 wt. % Al2O3 and Co3O4-5 wt. % Y2O3 Composites", Jouranl of Particle Science and Technology, Vol. 4, pp. x-x, 2018 (In press).
[17] Nekokar, N., Pourabdoli, M., "Isothermal Redox Kinetics of Co3O4-Fe2O3 Nano-Composite as a Thermochemical Heat Storage Material", International Journal of Engineering, Vol. 32, pp. 1200-1209, 2019,