Synthesis and characterisation of K2[LnTa3O10]·nH2O (Ln = La, Pr, Nd): cation-deficient layered perovskite tantalates for water photolysis

Author:

Valencia-Sanchez Hoover1,Pfeiffer Heriberto2,Acosta Dwight3,Negrón-Mendoza Alicia4,Tavizon Gustavo1

Affiliation:

1. Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, C.P. 04510, México D.F.

2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, C.P. 04510, México D.F.

3. Instituto de Física, Universidad Nacional Autónoma de México, Ciudad Universitaria, C.P. 04510, México D.F.

4. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad Universitaria, C.P. 04510, México D.F.

Abstract

Compounds with the nominal formula K2[LnTa3O10] (Ln = La, Nd, Pr), crystallising in a cation-deficient Ruddlesden–Popper structure, were prepared by the Pechini (polymeric complex) method. The crystal structures of the hydrated form of these compounds were determined by Rietveld analysis of the X-ray powder diffraction data and high-resolution transmission electron microscopy. The samples were also analysed to determine their specific areas (Brunauer–Emmett–Teller method) and degree of hydration (thermogravimetric analysis) and were tested as photocatalysts in the photocatalytic production of H2 from water. The activity to produce H2 from pure water decreased in the order Pr > La > Nd. The NiOx impregnation on the surface of the photocatalysts had no notable effect on the photocatalytic activity.

Publisher

Canadian Science Publishing

Subject

Organic Chemistry,General Chemistry,Catalysis

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