Enhanced water splitting through two-step photoexcitation by sunlight using tantalum/nitrogen-codoped rutile titania as a water oxidation photocatalyst
Shunta Nishioka, Kei-ichi Yanagisawa, Daling Lu, Junie Jhon M. Vequizo, Akira Yamakata, Koji Kimoto, Miki Inada, Kazuhiko Maeda.