BaCe_0.25Mn_0.75O_3−δ—a promising perovskite-type oxide for solar thermochemical hydrogen production

Abstract

BCM is a new water-splitting STCH material with promising high-conversion performance and kinetics, formed from two non water-splitting parent perovskites.

Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

“…It was highlighted that the BaCe 0.25 Mn 0.75 O 3 formulation haD higher reduction ability than ceria for a temperature below 1400 • C. Furthermore, this perovskite produces three times more hydrogen (140 µmol/g) than ceria with a reduction temperature of 1350 Figure 8. Thus, BaCe 0.25 Mn 0.75 O 3 perovskite is able to perform water splitting under milder conditions in the aim of future large-scale implementation [67].…”

“…The fuel productions for La0.6Sr0.4Mn0.6Al0.4O3, BaCe0.25Mn0.75O3, and ceria under various H2O:H2 ratios are illustrated in Figure 8. Thus, BaCe0.25Mn0.75O3 perovskite is able to perform water splitting under milder conditions in the aim of future large-scale implementation [67]. The Ba 1−x Sr x FeO 3 perovskite was also studied for thermochemical cycles.…”

“…H2 production as function of the H2O:H2 ratio for La0.6Sr0.4Mn0.6Al0.4O3, BaCe0.25Mn0.75O3, and ceria at Tred = 1350 °C and Tox = 850 °C (adapted from Reference[67]). …”

Modifying La0.6Sr0.4MnO3 Perovskites with Cr Incorporation for Fast Isothermal CO2‐Splitting Kinetics in Solar‐Driven Thermochemical Cycles

“…Currently, the state-of-the-art material is ceria due to its suitable thermodynamic properties and fast kinetics for syngas production. [10,11] Based on the amount of fuel produced per cycle, the La 0.6 Sr 0.4 MnO 3 perovskite is still an attractive option for thermochemical syngas production, [10,11,[13][14][15][16][17][18][19][20] provided the kinetics and/or thermodynamics are improved. [6] Exploring alternative materials that provide a higher oxygen release and better splitting kinetics (when compared to that of ceria) is of scientific and technological interest.…”

“…[10,11] High CO yields were obtained for La 1−x Sr x MnO 3 perovskites (x = 0.4), but the decrease in enthalpy of reduction with increasing Sr content [12] also leads to a lower thermodynamic driving force for fuel production resulting in slower splitting kinetics. [10,11] Based on the amount of fuel produced per cycle, the La 0.6 Sr 0.4 MnO 3 perovskite is still an attractive option for thermochemical syngas production, [10,11,[13][14][15][16][17][18][19][20] provided the kinetics and/or thermodynamics are improved. This fact motivated the present work, in which we have explored the partial substitution of Mn by Cr with the purpose of studying its effect on the CO 2 -splitting capabilities.…”