RT Journal Article
T1 Novel perovskite materials for thermal water splitting at moderate temperature
A1 Azcondo, M. Teresa
A1 Orfila, Maria
A1 Marugan, Javier
A1 Sanz, Raul
A1 Muñoz-Noval, Alvaro
A1 Salas Colera, Eduardo
A1 Ritter, Clemens
A1 García-Alvarado, Flaviano
A1 Amador, Ulises
AB Materials with the formula Sr2CoNb1−xTixO6−δ (x=1.00, 0.70; δ=number of oxygen vacancies) present a cubic perovskite-like structure. They are easily and reversibly reduced in N2 or Ar and re-oxidized in air upon heating. Oxidation by water (wet N2), involving splitting of water at a temperature as low as 700 °C, produces hydrogen. Both compounds displayed outstanding H2 production in the first thermochemical cycle, the Sr2CoNb0.30Ti0.70O6−δ 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−δ, two phases with different oxygen contents segregated, whereas in Sr2CoNb0.30Ti0.70O6−δ this effect was not evident. Therefore, this latter material displayed a hydrogen production as high as 410 μmolurn:x-wiley:18645631:media:cssc201901484:cssc201901484-math-0001  g−1perovskite after eight thermochemical cycles at 700 °C, which is among the highest ever reported, making this perovskite a promising candidate for thermosolar water splitting in real devices.
PB Wiley
SN 1864-5631
YR 2019
FD 2019-09-06
LK https://hdl.handle.net/10016/37815
UL https://hdl.handle.net/10016/37815
LA eng
NO We thank Agencia Estatal de Investigación (AEI)/Fondo Europeo de  Desarrollo Regional (FEDER/UE)for funding the  project MAT2016-78632-C4-1-R. We acknowledge CSIC, ILL, and ESRF for financial support and facilitated access to the BM25-SpLine line at ESRF and D2B diffractometer at ILL. The authors also thank "Comunidad de Madrid" and the European Structural Funds for their financial support to the ALCCONES (S2013/MAE-2985) and MATERYENER3-CM (S2013/MIT-2753) projects.
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