AUTHOR=Sawaguri Hiroki , Gokon Nobuyuki , Hayashi Kosuke , Iwamura Yoshikazu , Yasuhara Daichi 

TITLE=Two-Step Thermochemical CO2 Splitting Using Partially-Substituted Perovskite Oxides of La0.7Sr0.3Mn0.9X0.1O3 for Solar Fuel Production

JOURNAL=Frontiers in Energy Research

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.872959

DOI=10.3389/fenrg.2022.872959

ISSN=2296-598X

ABSTRACT=<p>We investigated, herein, the redox activity of partial substitution of the B-site in a series of lanthanum/strontium-manganese-based (LSM) perovskite oxide, La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>X<sub>0.1</sub>O<sub>3</sub> for solar two-step thermochemical fuel production using concentrated solar radiation as an energy source. We systematically investigated the effects of partial substitution in LaSrMnO<sub>3</sub> in terms of their kinetics behavior, oxygen/CO productivity, thermal reduction/oxidation temperatures. Furthermore, repeatability was evaluated and compared among the samples prepared using the same procedure and studied using the same test method. We observed and evaluated the long-term thermal stability of the redox activity and valence variation of the constituting ionic species of the perovskite in the two-step thermochemical CO<sub>2</sub> splitting. From the perspectives of superior activity and long-term repeatability, Ni-, Co-, and Mg-substituted LSM perovskites are promising for thermochemical two-step CO<sub>2</sub>/H<sub>2</sub>O splitting to produce synthetic gas.</p>