期刊
CHEMSUSCHEM
卷 12, 期 17, 页码 4029-4037出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201901484
关键词
hydrogen generation; perovskite phases; solar fuel; thermochemical cycle; water splitting
资金
- Agencia Estatal de Investigacion(AEI)/Fondo Europeo de Desarrollo Regional (FEDER/UE) [MAT2016-78632-C4-1-R]
- CSIC
- ILL
- ESRF
- Comunidad de Madrid
- European Structural Funds [S2013/MAE-2985, S2013/MIT-2753]
Materials with the formula Sr2CoNb1-xTixO6-delta (x=1.00, 0.70; delta=number of oxygen vacancies) present a cubic perovskite-like structure. They are easily and reversibly reduced in N-2 or Ar and re-oxidized in air upon heating. Oxidation by water (wet N-2), involving splitting of water at a temperature as low as 700 degrees C, produces hydrogen. Both compounds displayed outstanding H-2 production in the first thermochemical cycle, the Sr2CoNb0.30Ti0.70O6-delta material retaining its outstanding performance upon cycling, whereas the hydrogen yield of the x=1 oxide showed a continuous decay. The retention of the materials' ability to promote water splitting correlated with their structural, chemical, and redox reversibility upon cycling. On reduction/oxidation, Co ions reversibly changed their oxidation state to compensate the release/recovery of oxygen in both compounds. However, in Sr2CoTiO6-delta, two phases with different oxygen contents segregated, whereas in Sr2CoNb0.30Ti0.70O6-delta this effect was not evident. Therefore, this latter material displayed a hydrogen production as high as 410 mu molH2 g(perovskite)(-1) after eight thermochemical cycles at 700 degrees C, which is among the highest ever reported, making this perovskite a promising candidate for thermosolar water splitting in real devices.
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