LaTiO 2 N has been considered as one of the most promising photocatalysts for solar energy conversion. Nevertheless, it generally has a poor photocatalytic activity under normal conditions, probably linked to severe structural distortions and various types of defects within this compound. Herein, we modified LaTiO 2 N by introducing Ba into its A site, that is, La 0.8 Ba 0.2 TiO 2.2 N 0.8 . The presence of Ba at the A site of LaTiO 2 N not only relaxes the structural distortions but also effectively inhibits defect formation (e.g. Ti 3+ species) in LaTiO 2 N. Moreover, surface hydrophilicity of LaTiO 2 N is also improved by Ba modification. Photoelectrochemical analysis suggests that charge separation and transferring situation are ameliorated in Ba-modified LaTiO 2 N, and the valence band edge position is positively shifted. These factors are likely the reasons for the improved photocatalytic activity of La 0.8 Ba 0.2 TiO 2.2 N 0.8 in water oxidation reactions.

Conjugated polymers have received significant attention as photocatalysts. However, photocatalytic oxygen evolution has only been reported for a few polymers so far. Here, we present a bipyridine-based covalent triazine-based framework...

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La/Zr co-doping preserves visible light absorption of SrTaO2N, prohibits the formation of defects, improves surface hydrophilicity and charge separation conditions, all of which contribute to an enhanced photocatalytic activity for water reduction.