We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
A novel CeO<sub>2</sub>- xSnO<sub>2</sub>/Ce<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> pyrochlore cycle for enhanced solar thermochemical water splitting.
- Authors
Ruan, Chongyan; Tan, Yuan; Li, Lin; Wang, Junhu; Liu, Xiaoyan; Wang, Xiaodong
- Abstract
A novel CeO2-xSnO2/Ce2Sn2O7 pyrochlore stoichiometric redox cycle with superior H2 production capacities is identified and corroborated for two-step solar thermochemical water splitting (STWS). During the first thermal reduction step (1400°C), a reaction between CeO2 and SnO2 occurred for all the CeO2-xSnO2 (x = 0.05-0.20) solid compounds, forming thermodynamically stable Ce2Sn2O7 pyrochlore rather than metastable CeO2-δ. Consequently, substantially higher reduction extents were achieved owing to the reduction of CeIV to CeIII. Moreover, in the subsequent reoxidation with H2O (800°C), H2 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 CeIII to CeIV. The H2O-splitting performance for CeO2-0.15SnO2 was reproducible over seven consecutive redox cycles, indicating the material was also robust. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3450-3462, 2017
- Subjects
PYROCHLORE; STOICHIOMETRY; WATER electrolysis; OXIDATION-reduction reaction; CHEMICAL reactions
- Publication
AIChE Journal, 2017, Vol 63, Issue 8, p3450
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.15701