Layered Dion-Jacobson type niobium oxides for photocatalytic hydrogen production prepared via molten salt synthesis

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Kulischow, Natalia ; Ladasiu, Calin ; Marschall, Roland:
Layered Dion-Jacobson type niobium oxides for photocatalytic hydrogen production prepared via molten salt synthesis.
In: Catalysis Today. Bd. 287 (2017) . - S. 65-69.
ISSN 0920-5861
DOI: https://doi.org/10.1016/j.cattod.2016.10.009

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Abstract

A class of Dion-Jacobson type layered perovskite niobium oxides (AB2Nb3O10 with A = K, Rb, Cs and B = Ca, Sr, Ba) was prepared via molten salt method for the first time. By dissolving oxide and carbonate precursors in A-cation chloride melts, this type of synthesis needs only two hours of preparation time resulting in highly crystalline layered niobates at a much shorter synthesis time compared to conventional syntheses, like the solid state reaction. Beside detailed materials characterization, we investigated the influence of A-cation and B-cation variation on the band gap and photocatalytic activity for hydrogen production. It was found that the band gap decreases with the increase in size of the B-cation. A strong dependence on interlayer spacing (influenced by the size of the A-cation) and lattice relaxation can be derived from the steady-state hydrogen evolution rates.