Utilization of infrared light in photocatalytic water splitting is highly important yet challenging given its large proportion in sunlight.Although upconversion material may photogenerate electrons with sufficient ene...Utilization of infrared light in photocatalytic water splitting is highly important yet challenging given its large proportion in sunlight.Although upconversion material may photogenerate electrons with sufficient energy,the electron transfer between upconversion material and semiconductor is inefficient limiting overall photocatalytic performance.In this work,a TiO_(2)/graphene quantum dot(GQD)hybrid system has been designed with intimate interface,which enables highly efficient transfer of photogenerated electrons from GQDs to TiO_(2).The designed hybrid material with high photogenerated electron density displays photocatalytic activity under infrared light(20 mW cm^(-2))for overall water splitting(H_(2):60.4μmol g_(cat).^(-1)h^(-1)and O_(2):30.0μmol g_(cat).^(-1)h^(-1)).With infrared light well harnessed,the system offers a solar-to-hydrogen(STH)efficiency of 0.80%in full solar spectrum.This work provides new insight into harnessing charge transfer between upconversion materials and semiconductor photocatalysts and opens a new avenue for designing photocatalysts toward working under infrared light.展开更多
基金the Natural Science Foundation of China(51902077 and 21725102)Zhejiang Provincial Natural Science Foundation(LY18E020010 and LQ19B010001)+3 种基金Zhejiang Province“Ten Thousand People Plan”(2018R52015)Pandeng Plan Foundation of Hangzhou Normal University for Youth Scholars of Materials,Chemistry and Chemical Engineering,Agricultural and Social Development Program Project(2020ZDSJ0712)of Hangzhou ScienceTechnology Bureau of Zhejiang Province,general items of Zhejiang Provincial Department of Education(Y201840068)Visiting Scholar Development Project of Department of Education of Zhejiang Provincial(FX2019043).
文摘Utilization of infrared light in photocatalytic water splitting is highly important yet challenging given its large proportion in sunlight.Although upconversion material may photogenerate electrons with sufficient energy,the electron transfer between upconversion material and semiconductor is inefficient limiting overall photocatalytic performance.In this work,a TiO_(2)/graphene quantum dot(GQD)hybrid system has been designed with intimate interface,which enables highly efficient transfer of photogenerated electrons from GQDs to TiO_(2).The designed hybrid material with high photogenerated electron density displays photocatalytic activity under infrared light(20 mW cm^(-2))for overall water splitting(H_(2):60.4μmol g_(cat).^(-1)h^(-1)and O_(2):30.0μmol g_(cat).^(-1)h^(-1)).With infrared light well harnessed,the system offers a solar-to-hydrogen(STH)efficiency of 0.80%in full solar spectrum.This work provides new insight into harnessing charge transfer between upconversion materials and semiconductor photocatalysts and opens a new avenue for designing photocatalysts toward working under infrared light.
