Exploitation of thermochemical cycles based on solid oxide redox systems for thermochemical storage of solar heat. Part 6: Testing of Mn-based combined oxides and porous structures

The attribute of perovskites for continuous, quasi-linear oxygen uptake/release, can be beneficial to hybridization of thermochemical with sensible storage within a wider temperature range. Addition of Ti was found to have a beneficial effect on the perovskites' redox stability. Whereas the shaping of such compositions to foams has not been attempted, CaMn0.9Ti0.1O3−δ perovskite pellets exhibited oxygen release/uptake per mass very close to that of the respective loose powder without structural degradation. However, the induced heat effects of the perovskites' redox reactions are substantially lower and need to be improved in the perspective of commercial-scale applications.