| Summary: | BaTaO2N with intense visible light absorption has been demonstrated as a promising photocatalyst for Z-scheme overall water splitting, whereas the photocatalytic activity of BaTaO2N is still restricted by strong charge recombination at structural defects. Here, we present the direct growth of BaTaO2N–BaNa0.25Ta0.75O3 solid solution from a lattice-matched BaNa0.25Ta0.75O3 precursor through volatilization of Na species during a nitridation process. This method promotes the direct phase transformation from BaNa0.25Ta0.75O3 to BaTaO2N to inhibit the formation of defect states. As a result, the as-obtained BaTaO2N–BaNa0.25Ta0.75O3 solid solution shows greatly enhanced activity compared to the conventional BaTaO2N, regardless of photocatalytic H2 evolution in the presence of methanol or Z-scheme overall water splitting. This study provides a facile method to construct (oxy)nitride-based solid solution photocatalysts with low defect density for efficient solar hydrogen production from water splitting.
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