Effects of Fe2O3 addition and mechanical activation on thermochemical heat storage properties of the Co3O4/CoO system

Document Type : Research Article

Authors

Department of Metallurgy and Materials Engineering, Hamadan University of Technology, Hamadan, Iran

Abstract

Effects of Fe2O3 addition (2-20 wt%) with 1 h mechanical activation on redox reactions of Co3O4 were studied by TG/DSC, SEM, and XRD analyses. The results showed that a Fe2O3 addition from 2 to 15 wt% increases the oxygen release from 1.4 to 3.4 wt% and decreases the reduction onset temperature from 1030 to 960 °C, while it increases the oxygen uptake value and re-oxidation onset temperature respectively from 1.5 to 3.3 wt% and from 930 to 1010 °C. The increase in iron oxide to 20 wt% resulted in loss of heat storage properties due to significant reduction in oxygen release and uptake. Moreover, TG/DSC analyses revealed that reduction enthalpy of as-received Co3O4, 1 h ball milled Co3O4, and 1 h ball milled Co3O4-15% Fe2O3 are 622, 496, and 895 kJ/kg, respectively. Phase identification and TG experiments under argon atmosphere demonstrated that Fe2O3 participates in the reduction process. Furthermore, adding 15 wt% of iron oxide to cobalt oxide and 1 h mechanical activation improved the redox cyclability of cobalt oxide.

Graphical Abstract

Effects of Fe2O3 addition and mechanical activation on thermochemical heat storage properties of the Co3O4/CoO system

Highlights

  • Effects of Fe2O3 addition and 1 h ball milling on redox reactions of Co3O4 were studied.
  • Some of the Fe2O3 reduced to Fe3O4 during the reduction process.
  • ΔHRed of Co3O4, 1 h ball milled  Co3O4, and 1 h ball mllied Co3O4-15 wt% Fe2O3 are 622, 496, and 895 kJ/kg, respectively.
  • Fe2O3 addition and ball milling improved the redox cyclability of Co3O4.

Keywords

References

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Journal of Particle Science and Technology
Volume 4, Issue 1
March 2018
Pages 13-22

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History

  • Receive Date: 26 February 2018
  • Revise Date: 01 June 2018
  • Accept Date: 10 June 2018

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