期刊
AICHE JOURNAL
卷 63, 期 8, 页码 3450-3462出版社
WILEY
DOI: 10.1002/aic.15701
关键词
solar fuel; pyrochlore; stoichiometric; water splitting; H-2 production
资金
- National Natural Science Foundation of China [21476232, 21573232, 21522608, 21676269]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020100]
A novel CeO2-xSnO(2)/Ce2Sn2O7 pyrochlore stoichiometric redox cycle with superior H-2 production capacities is identified and corroborated for two-step solar thermochemical water splitting (STWS). During the first thermal reduction step (1400 degrees C), a reaction between CeO2 and SnO2 occurred for all the CeO2-xSnO(2) (x = 0.05-0.20) solid compounds, forming thermodynamically stable Ce2Sn2O7 pyrochlore rather than metastable CeO2-delta. Consequently, substantially higher reduction extents were achieved owing to the reduction of Ce-IV to Ce-III. Moreover, in the subsequent reoxidation with H2O (800 degrees C), H-2 production capacities increased by a factor of 3.8 as compared to the current benchmark material ceria when x = 0.15, with the regeneration of CeO2 and SnO2 and the concomitant reoxidation of Ce-III to Ce-IV. The H2O-splitting performance for CeO2-0.15SnO(2) was reproducible over seven consecutive redox cycles, indicating the material was also robust. (C) 2017 American Institute of Chemical Engineers
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