A Ta-based oxynitride photocatalyst, BaTaO 2 N, was obtained by an ammonothermal method using supercritical ammonia as a reaction medium. Oxynitrides are generally obtained via multi-step reaction processes requiring high-temperature nitridation of an oxide precursor. In this study, we have successfully synthesized an oxynitride via a simple one-pot method. Moreover, BaTaO 2 N was obtained at a temperature approximately 300°C lower than that of the conventional method. NaNH 2 was selected as a basic mineralizer with the aim to improve the solubility of the starting materials in supercritical ammonia. Addition of NaNH 2 led to a BaTaO 2 N material with improved crystallinity (i.e., NaNH 2 inhibited lattice defects). Under visible light irradiation, Pt-loaded BaTaO 2 N samples reduced water into hydrogen in the presence of a sacrificial reagent.
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