期刊
ENERGY TECHNOLOGY
卷 3, 期 11, 页码 1130-1142出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201500226
关键词
CO2 splitting; nonstoichiometric compounds; perovskite phases; redox cycle; solar fuels
资金
- Swiss Competence Center Energy Mobility
- European Research Council under the European Union's ERC Advanced Grant (SUNFUELS) [320541]
Perovskite oxides have recently been proposed as promising redox intermediates for solar thermochemical splitting of H2O and CO2, offering the benefit of significantly reduced operating temperatures. We present a systematic experimental screening of doped lanthanum manganites within the composition space La1-x(Ca,Sr)(x)Mn1-yAlyO3 and identify several promising redox materials. In particular, La0.6Sr0.4Mn0.6Al0.4O3 and La0.6Ca0.4Mn0.6Al0.4O3 boast a five- to thirteen-fold improvement in the reduction extent compared to the state-of-the-art material CeO2 in the temperature range 1200-1400 degrees C. The materials are shown to be capable of splitting CO2 into CO fuel when isothermally cycled between low-pO(2) and high-pCO(2) environments at 1240 degrees C and to approach full reoxidation in CO2 with temperature swings as low as 200 degrees C, with mass-specific fuel yields up to tentimes that of CeO2. The underlying material thermodynamics are investigated and used to explain the favorable redox behavior.
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