Temperature impacts on reactivity of La0.7A0.3Mn0.9Cr0.1O3-δ of perovskite oxides in a thermochemical two-step H2O/CO2 splitting

Thermochemical two-step H2O/CO2−splitting cycles using perovskite oxides of La0.7A0.3Mn0.9Cr0.1O3-δ (A=Ca, Sr, Ba) were examined in order to produce hydrogen/carbon monoxide using concentrated solar irradiation. Temperature impacts on redox activity, reactivity and reaction rate of La0.7A0.3Mn0.9Cr0.1O3-δ were investigated with various temperature conditions. The redox activities of these perovskites were evaluated with the same reaction conditions and temperature program. In addition, two-step water-splitting cyclic tests using La0.7A0.3Mn0.9Cr0.1O3-δ, were also examined for the reactivity and repeatability of H2 production at thermal reduction temperature of 1400 °C and water spitting temperature of 1000 °C.