Cobalt/cobaltous oxide based honeycombs for thermochemical heat storage in future concentrated solar power installations: Multi-cyclic assessment and semi-quantitative heat effects estimations

Thermochemical H2O and CO2 splitting redox cycles in a NiFe2O4 structured redox reactor: Design, development and experiments in a high flux solar simulator

“…Three different structures (foam, extruded honeycomb monolith, cast monolith), consisting entirely of NiFe 2 O 4 , were evaluated in the tubular reactor installed in the high flux solar simulator. The techniques used for the manufacturing of the various structures were: (i) the conventional manufacturing technique of the ''replication of polymer foams" as molds for the preparation of opencell NiFe 2 O 4 foam with pore density of 10 ppi (pores per linear inch) (Schwartzwalder and Somers, 1963); (ii) the extrusion process for the manufacturing of a 90 cpsi (cells per square inch) NiFe 2 O 4 honeycomb monolith (Karagiannakis et al, 2016;Pagkoura et al, 2015), similarly to what is commonly used for the manufacturing of numerous technical ceramics (e.g. Cordierite, SiC, Al 2 O 3 , etc) for a variety of applications (e.g.…”

Thermochemical cycles over redox structured reactors

“…The main details of the extrusion process were similar to the ones provided in Refs. [34,35]. Two different "feeding pastes" were extruded in this study; one comprising a stoichiometric mixture of raw oxide reactants (i.e.…”

The favourable thermodynamic properties of Fe-doped CaMnO3 for thermochemical heat storage

“…11,12 Interest has recently grown in metal oxide reduction/oxidation (redox) pairs due to their reversibility, higher temperature of operation than molten salts, and absence of gas products that would otherwise require separation and/or storage. Metal oxides, such as Co 3 O 4 /CoO, 13,14 Mn 2 O 3 /Mn 3 O 4 , 15,16 CuO/Cu 2 O, 17 have been widely investigated due to their high energy storage density and their ability to accumulate heat in a temperature range close to that at which CSP receivers operate. However, some of these materials display low cyclability due to sintering, which leads to a decrease of the reaction rates with increasing numbers of cycles.…”