Abstract
Solar heterogeneous photocatalysis is a highly desirable way for the degradation of volatile organic compounds. Controlled creation of intrinsic oxygen vacancies can significantly modulate the optical and electronic properties of metal oxide semiconductors. However, poor charge utilization in defective metal oxides restrains their photocatalysis efficiency by the sluggish interfacial reaction dynamics. Herein, we demonstrate an effective photogenerated carriers collection for VOCs oxidation by mean of broadband light absorption and unidirectional electron flow to surface reactive sites by synergetic contribution of Pt nanoparticles acting as electron trapping and WO3 with abundant oxygen vacancies via facile one-step room-temperature NaBH4 treatment strategy. The optimized Vo-rich (oxygen vacancies-rich) Pt/WO3 nanosheets is able to achieve effective charge carrier utilization in a high toluene conversion of 98% even at a high CO2 yield of 95% with a quantum efficiency of 55.7% and good stability under solar light irradiation. This work highlights using oxygen vacancies-rich semiconductor as a promising support to design efficient and durable photocatalyst with collaborative optimizing charge separation and utilization, which will provide valuable insights on the defect engineering for photoredox catalysis applications toward efficient solar-to-chemical energy conversion.
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