Construction of high-efficiency CoS@Nb2O5 heterojunctions accelerating charge transfer for boosting photocatalytic hydrogen evolution |
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| Affiliation: | 1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China;2. XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an 710049, China;3. Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Science & Sichuan Provincial People''s Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu 610072, China;4. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore;5. State Centre for International Cooperation on Designer Low-carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;6. School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China |
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| Abstract: | The random movement and easy recombination of photoinduced charges lead to a low conversion efficiency for photocatalytic hydrogen evolution. The cocatalyst design is a promising route to address such problem through introducing an appropriate cocatalyst on the semiconductor photocatalysts to construct the high-efficiency heterojunctions. Herein, novel CoS/Nb2O5 heterojunctions were constructed via in-situ loading CoS cocatalyst on the surface of Nb2O5 nanosheets. Through the femtosecond-resolved transient absorption spectroscopy, the average lifetime of charge carriers for 10 wt% CoS/Nb2O5 (159.6 ps) is drastically shortened by contrast with that of Nb2O5 (5531.9 ps), strongly suggesting the rapid charge transfer from Nb2O5 to CoS. The significantly improved charge-transfer capacity contributes to a high photocatalytic hydrogen evolution rate of 355 µmol/h, up to 17.5 times compared with pristine Nb2O5. This work would provide a new design platform in the construction of photocatalytic heterojunctions with high charge-transfer efficiency. |
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