3 years ago

Enhanced Photoactivity from Single-Crystalline SrTaO2N Nanoplates Synthesized by Topotactic Nitridation

Enhanced Photoactivity from Single-Crystalline SrTaO2N Nanoplates Synthesized by Topotactic Nitridation
Sara E. Skrabalak, Jie Fu
There are few methods yielding oxynitride crystals with defined shape, yet shape-controlled crystals often give enhanced photoactivity. Herein, single-crystalline SrTaO2N nanoplates and polyhedra are achieved selectively. Central to these synthetic advances is the crystallization pathways used, in which single-crystalline SrTaO2N nanoplates form by topotactic nitridation of aerosol-prepared Sr2Ta2O7 nanoplates and SrTaO2N polyhedra form by flux-assisted nitridation of the nanoplates. Evaluation of these materials for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) showed improved performance for the SrTaO2N nanoplates, with a record apparent quantum efficiency (AQE) of 6.1 % for OER compared to the polyhedra (AQE: 1.6 %) and SrTaO2N polycrystals (AQE: 0.6 %). The enhanced performance from the nanoplates arises from their morphology and lower defect density. These results highlight the importance of developing new synthetic routes to high quality oxynitrides. Keep in shape: Topotactic nitridation of aerosol-prepared Sr2Ta2O7 nanoplates gives single-crystalline SrTaO2N nanoplates. They exhibit higher photoactivity for water oxidation: four- and ten-times more than SrTaO2N polyhedra prepared by flux-assisted nitridation and a SrTaO2N polycrystals reference, respectively. The high photoactivity of the nanoplates arises from their morphology and lower defect density.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708645

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