The Thermodynamics of Magnesium Manganate Reduction As Applied to Thermochemical Energy Storage

Thermochemical energy storage shows potential for providing 24 hour a day energy when combined with solar power plants and conventional electricity production means. Operating the system at high temperatures allow for high levels of efficiency to be reached, and the long-duration ability of the technology allows for this type of storage to be used to replace current methods, or to supplement existing infrastructure. MgMn₂O₄ is of interest as they are low cost and have high reduction/oxidation temperatures. The energy density of the material determines the storage capacity of any potential systems; therefore we report on the energy density of this material as well as its underlying thermodynamics, using Van’t Hoff analysis in conjunction with thermogravimetric data. Density functional theory calculations are used to understand the thermodynamic limitations. We explore the material as a function of Mg:Mn content, and provide novel means of increasing the reactivity. Additionally, material characterization confirms the phase purity of the synthesized material.