Abstract
Grain boundaries serve as an interception to the transportation of photo-generated charges (e- and h+), severely undermining the photocatalytic performance. In this work, SrNbO2N porous single crystals (PSCs) free of grain boundaries have been synthesized, which deliver exceptionally high photocatalytic activity and stability for water oxidation reactions. The removal of grain boundaries warrants fast charge transportation, reducing the risks of charge recombination. The high porosity of PSCs supplies ample inner surface to carry out catalytic reactions. Deposited with a proper cocatalyst, SrNbO2N PSCs can photocatalyze water oxidation into O2 with apparent quantum efficiency (AQE) as high as 5.64% at 420 ± 20 nm. The high activity is also exemplified by integrating SrNbO2N PSCs into a Z-scheme system which can split water into H2 and O2 in stoichiometry under simulated solar insolation. These findings not only prove that PSCs expedite charge migration, triggering a high activity for photocatalytic reactions, but also enliven more attention upon traditional materials that hold the potential for solar energy conversions.
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