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Photoelectrochemical water splitting using semiconductors absorbing a wide range of visible light is a potentially attractive means of harvesting large portions of the solar spectrum. However, this is also very challenging because narrowing the semiconductor band gap lowers the driving force for photoreactions. Herein, a highly active perovskite BaNbO2N exhibiting photoexcitation up to 740 nm for water oxidation is reported. The synthesis route, consisting of moderate nitridation and subsequent annealing in inert Ar flow, enhances the crystallinity of the BaNbO2N surface without inducing the reduction of the Nb species. As a result, a particulate BaNbO2N photoanode exhibits a photocurrent of 5.2 mA cm−2 at 1.23 VRHE under simulated solar irradiation, which is the highest yet reported for an oxynitride responsive at wavelengths above 600 nm. Suppressing the reduction of B‐site cations during the synthesis of perovskite AB(O,N)3, which otherwise results in surface defects or impurities, is critical for achieving high water oxidation activity.
Advanced Energy Materials – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ;
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