Study On The Thermochemical Stability Of Mixed Metal Materials

The development of high-temperature thermochemical energy storage materials with excellent stability provides a wide range of options for the application of concentrated solar energy(CSP)systems.Therefore,the development of thermochemical energy storage materials with excellent stability at high temperatures is important for the integration of thermal energy storage.The application of the(TES)system plays an important role.In this paper,the rare earth element La is added to the CuO/Cu₂O redox pair to study its effect on the redox performance of the material.The effect of La addition on the thermochemical energy storage performance of the CuO/Cu₂O redox couple was evaluated by thermogravimetric analysis(TGA)technology.The results show that the addition of lanthanum can significantly reduce the reduction temperature of metal oxides,significantly narrow the redox hysteresis zone,and greatly improve the efficiency of the entire process.Through the comparison of several sets of data,it is also found that with the doping of La,the reduction rate is greatly improved,and a small amount of La doping will not affect the weight storage density of CuO.The copper-manganese mixed metal oxide with spinel structure was synthesized by Pechini method.Through XRD,thermogravimetric analysis(TGA)and differential scanning calorimetry(DSC)analysis to determine the morphological characteristics and physical and chemical properties of the sample.By comparing Cu Mn₂O₄ spinel and pure metal oxide,it is found that the sample with a molar mass of 1/3 of Cu exhibits excellent cycle stability and a more flexible temperature range.It is a potential candidate for heat storage materials.And by comparing the redox cycles of air and nitrogen-air,it can be found that the reduction in an inert atmosphere is more thorough than the reduction in an air atmosphere.The focus is on the redox cycle performance of copper and manganese mixed metal oxides(with different Cu ratios)with spinel structure as thermochemical energy storage potential.Through XRD characterization and thermogravimetric analysis(TGA)to determine the sample morphology and redox cycle performance,it is found that the mixed metal oxide of copper and manganese has a typical spinel structure,and the thermochemical energy storage performance of the mixed metal oxide is remarkable Depends on the initial Mn/Cu molar mass ratio.