Journal
THERMOCHIMICA ACTA
Volume 680, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tca.2019.178374
Keywords
Concentrated solar radiation; Perovskite oxide; Thermochemical cycle; Water splitting; Hydrogen production
Funding
- Ministry of Education, Culture, Sports, Science and Technology [16H04645, 16K06969]
- Grants-in-Aid for Scientific Research [16K06969, 16H04645] Funding Source: KAKEN
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A thermochemical two-step water-splitting cycle using perovskite oxides based on LaSrMnAlO3 was examined for hydrogen production from water using concentrated solar radiation. Concurrent Sr and Mn substitutions in La1-xSrxMnxAl1-xO3, Sr and Al substitutions in La1-ySryMn1-yAlyO3, and substitution of Al by Cr in La0.7Sr0.3Mn1-zCrzO3 were examined, and their kinetics, oxygen/hydrogen productivity, and repeatability were compared against LaSrMnAlO3. The impact of the chemical compositions of the perovskite oxides was systematically examined at a thermal reduction temperature of 1350 degrees C and water decomposition temperatures of 1000-1200 degrees C. From the viewpoints of average amounts of oxygen and hydrogen produced and the H-2/O-2 ratios, La0.7Sr0.3Mo0.9Cr0.1O3 and La0.7Sr0.3Mn0.8Cr0.2O3 provided the most reproducible productions of oxygen and hydrogen in the thermochemical two-step water-splitting cycle.
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