RT Journal Article
T1 Novel perovskite materials for thermal water splitting at moderate temperature
A1 Azcondo, M. Teresa
A1 Orfila, María
A1 Marugán, Javier
A1 Sanz Martín, Raúl
A1 Muñoz Noval, Álvaro
A1 Salas Colera, Eduardo
A1 Ritter, Clemens
A1 García Alvarado, Flaviano
A1 Amador, Ulises
AB Materials with the formula Sr_2CoNb_1-xTi_xO_(6-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 ºC, produces hydrogen. Both compounds displayed outstanding H_2 production in the first thermochemical cycle, the Sr_2CoNb_(0.30)Ti_(0.70)O_(6-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 Sr_2CoTiO_(6-delta), two phases with different oxygen contents segregated, whereas in Sr_2CoNb_(0.30)Ti_(0.70)O_(6-delta) this effect was not evident. Therefore, this latter material displayed a hydrogen production as high as 410 mu molH_2/g_(perovskite) after eight thermochemical cycles at 700 ºC, which is among the highest ever reported, making this perovskite a promising candidate for thermosolar water splitting in real devices.
PB Wiley-V C H VERLAG GMBH
SN 1864-5631
YR 2019
FD 2019-07-08
LK https://hdl.handle.net/20.500.14352/13665
UL https://hdl.handle.net/20.500.14352/13665
LA eng
NO ©2019 Wiley-V C H VERLAG GMBHWe thank Agencia Estatal de Investigacion(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.
NO Ministerio de Economía y Competitividad (MINECO) / FEDER
NO Comunidad de Madrid/FEDER
DS Docta Complutense
RD 10 abr 2025