Solid state reaction was employed for synthesis of a series of barium titanate-based materials with the stoichiometric formula BaTi 1-xSn xO 3 (BTS, x = 0, 0.05, and 0.10), where Sn4+ partially occupies Ti4+ position. The photoelectrocatalytic activities of the BTS materials were tested for the hydrogen evolution reaction in acidic (0.1 M H 2SO 4) and alkaline (0.1 M NaOH) electrolytes. The phase composition, morphology, and optical properties of the BTS materials were examined. The photoelectrocatalytic activities of BTS materials were correlated with the physico-chemical properties. It was shown that all the BTS materials have good photoelectrocatalytic activities for hydrogen evolution reaction, that the activities depend on the electrolyte type, and that can be modified by adjusting the Ti4+/Sn4+ ratio in the BaTi 1-xSn xO 3 crystal structure.
Marković et al. (Thu,) studied this question.