The investigation of SrCoO3-δ perovskite doping cobalt oxide thermochemical energy storage system

Abstract

BackgroundThe current research of doping for metal oxide thermochemical energy storage (TCES) systems mainly focuses on the mutual doping among traditional metal oxides. However, it is too one-sided to solve the problem. In this work, SrCoO3-δ perovskite material is novelly doped into the cobalt oxide material system to solve the dehiscent problem of honeycombs, while compensating the energy storage density of materials system. MethodsSimultaneous thermal analysis (STA) is used to assess energy storage density, reaction kinetics, stability of materials. Thermo-mechanical stability assessment and thermal expansion tests are conducted to analyze the anti-crack performance of honeycombs. XRD, SEM, and XPS methods are used to analyze the characteristics of materials. Significant findingsThe mass ratio of doping of 30% exhibits the best comprehensive performance. Based on this, the attenuation of energy storage density of SrCoO3-δ doping is narrowed from 27.1% to 22.9% at least compared with Al2O3 doping for anti-crack, and SrCoO3-δ doping has no negative effects on reaction kinetics of original cobalt oxide and a better stability. Beyond that, the SrCoO3-δ doping method of this work exhibits a better balance among various performance indicators of TCES than traditional doping methods based on improving TCES performance.