Redox behavior of potassium doped and transition metal co-doped Ce_0.75Zr_0.25O₂ for thermochemical H₂O/CO₂ splitting

Abstract

Potassium doped and co-doped ceria–zirconia show improved CO2/H2O splitting activity. This holds huge promise for the design of high performance systems for solar thermochemical splitting cycles allowing the production of solar fuels.

Solar-driven thermochemical conversion of H2O and CO2 into sustainable fuels

“…At present, the development of new formulations for doped CeO 2 become a research trend, various novel research results (including their chemical synthesis, performance testing, and reaction kinetics) are reported continuously. 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 …”

Redox Cycles, Active Materials, and Reactors Applied to Water and Carbon Dioxide Splitting for Solar Thermochemical Fuel Production: A Review

“…The reduction capacity of the ceria-based material can be further enhanced if ceria is doped with aliovalent or tetravalent cationic elements [111][112][113][114][115][116][117][118][119]. Various studies focused on the proposal of new formulations for doped ceria, including their chemical synthesis and testing implementation and have, for instance, demonstrated the benefit of doping with Zr 4+ (Ce x Zr 1−x O 2 ) [120][121][122].…”

Redox kinetics of ceria–zirconia (Ce1−xZrxO2−δ) for thermochemical partial oxidation of methane and H2O/CO2 splitting at moderate temperature

“…At the beginning of the reaction, CH 4 is partially oxidized by the surface labile oxygen of CeO 2 , which accounts for 30-50% of the total active oxygen. 42 As the surface oxygen is depleted, the bulk lattice oxygen diffuses to the surface and reacts with the chemisorbed C generated by CH 4 decomposition. The current kinetic studies of POx of CH 4 over CeO 2 are mostly focused on the overall reaction process, while ignoring the differences in the surface and bulk oxygen species in the POx of CH 4 .…”