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One step in situ synthesis of core-shell structured Cr 2 O 3 :P@fibrous-phosphorus hybrid composites with highly efficient full-spectrum-response photocatalytic activities.

Nanoscale 2017 March 3
Making full use of solar energy and achieving high charge separation efficiency are critical factors for the photocatalysis technique. In this work, we report core-shell structured fibrous phosphorus (f-P) coated P-doped Cr2 O3 (Cr2 O3 :P@f-P) hybrid composites with a strong optical absorption in the full region of 200-2600 nm. The Cr2 O3 :P@f-P hybrid composites exhibit a record photocatalytic efficiency under UV, visible and near-infrared light irradiation, demonstrating as promising photocatalysts for the full utilization of solar energy. Systematical investigations combining experimental and theoretical work show that P doping modifies the electronic band structures and creates defective levels in the forbidden gap of Cr2 O3 which extends the optical absorption to the visible and near-infrared regions. Highly crystalline fibrous phosphorus in situ grown on the Cr2 O3 particles constructs a core-shell hybrid structure which guarantees intimate interfacial contact between f-P and Cr2 O3 :P and facilitates the separation of photogenerated electron-hole pairs. This study develops a promising system based on earth abundant element P to utilize the overall spectrum of sunlight for photochemical applications.

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