Ionic Thermal Synthesis and Reversible Heat Storage Performance of Manganese-based Oxides

Concentrated solar power plant needs to be equipped with large-scale high-temperature heat storage module. Metal oxides can store and release heat through reversible redox reaction. Manganese oxides is non-toxic and cheap, showing great potential for applying in solar power plant, but it displays poor reversibility. Here, a manganese-based oxides with high reversibility by deep eutectic solvent (DES) ionic thermal synthesis was proposed, and effects of synthesis parameters and iron doping on heat storage performance were studied. MnCO 3 , as the raw material, was used to produce manganese oxides by ionic thermal decomposition at high temperature and released CO 2 , which could also form abundant pore structure, providing great channels for oxygen transmission and diffusionfor redox. Although this Mn 2 O 3 synthesis method showed better reactivity than commercial Mn 2 O 3 , its oxidation rate was low. It is worth noting that oxidation rate of manganese iron oxide doped with 20% Fe, synthesized at 150 , was fast.