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Abstract
The facile one-step hydrothermal method successfully synthesized a superb piezo-photocatalytic CoSe2-x with extraordinary performance towards piezo-photocatalytic H2O2 generation. CoSe2-x exhibits an enhanced piezoelectric and photocatalytic activity upon stimulation inside the ultrasound-assisted photocatalytic system. Experimental analysis proves that CoSe2-x possesses properties of piezo-photocatalysis that are crucial for the outstanding performance. The unique morphology, band-structure position, and surface defects helped substantially enhance the piezo-photocatalytic performance and facilitate the photogenerated species separation. The catalyst system has been optimized with different hydrothermal preparation conditions. CoSe2-x synthesized for 24 h achieves a high yield of H2O2 up to 1536 mM⋅g−1⋅h−1 during the piezo-photocatalytic ORR process. The proposed mechanism of piezo-photocatalyst discussed in generating H2O2 could establish a new point of view for selenide-based materials in many research fields.
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