A La–N-codoped NaTaO3 photocatalyst was synthesized by the solid-state reaction and thermal ammonolysis method. The photocatalytic reactions showed that La–N-codoped NaTaO3 has high activity of H2 evolution (7.0 µmol h−1) and long time stability under visible-light irradiation (λ > 420 nm). DFT calculations suggested that the visible-light absorption of La–N-codoped NaTaO3 originated from the transition of electrons from the impurity states to the bottom of the conduction band.

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