(532i) Oxidation Kinetics of Fe Doped Magnesium Manganate Systems

Growing utilization of renewably generated energy introduces a problem of intermittency into the energy grid. Thermochemical energy storage (TCES) is one proposed method of energy storage that can be utilized at the grid level to solve the intermittency issue. TCES is capable of providing higher energy densities than alternative thermal energy methods. Critical to the success of TCES is the selection of the storage material, where reactive stability, high operating temperatures, low cost, and high energy density are desired. Research into the optimal storage material is ongoing, but metal oxide redox materials provide one promising area of interest. Of this class of materials, manganese oxides have gathered lots of interest due to its relatively high reaction enthalpy, and numerous studies have investigated transition metal doping as a method to counteract the sintering issues that plague this system. The Mg doped Mn₃O₄/MnO system has been studied as it combines low cost, reactive stability, high operating temperatures and energy density with decreased sintering effects. In this work we investigate how doping small concentrations of Fe into the Mg-Mn material affects the oxidation kinetics to further the understanding of how dopants can improve materials for TCES.