Spatial Heterojunction in Nanostructured TiO2 and Its Cascade Effect for Efficient Photocatalysis
| Autor: | Xiu Cheng, Bao-Lian Su, Zhi-Yi Hu, Ge Tian, Christoph Janiak, Xiao Hang Yang, Yue Xing Zhang, Gustaaf Van Tendeloo, Yuan Zhou Li, Weihua Li, Liying Wang, Yi Lu, Xiao-Yu Yang, Gang Gang Chang, Si Ming Wu, Jia Wen Liu, Li He, Xiaolong Liu |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
cascade effect Bioengineering 02 engineering and technology Ti-vacancy law.invention law General Materials Science spatial heterojunction Quantum Photocurrent carbon dioxide reduction seawater splitting business.industry Graphene Mechanical Engineering Heterojunction General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Cascade effect Cascade Photocatalysis Water splitting Optoelectronics 0210 nano-technology business |
| Zdroj: | Nano Letters. 20(5):3122-3129 |
| ISSN: | 1530-6984 |
| DOI: | 10.1021/acs.nanolett.9b05121 |
| Popis: | A highly efficient photoenergy conversion is strongly dependent on the cumulative cascade efficiency of the photogenerated carriers. Spatial heterojunctions are critical to directed charge transfer and, thus, attractive but still a challenge. Here, a spatially ternary titanium-defected TiO2@carbon quantum dots@reduced graphene oxide (denoted as VTi@CQDs@rGO) in one system is shown to demonstrate a cascade effect of charges and significant performances regarding the photocurrent, the apparent quantum yield, and photocatalysis such as H2 production from water splitting and CO2 reduction. A key aspect in the construction is the technologically irrational junction of Ti-vacancies and nanocarbons for the spatially inside-out heterojunction. The new "spatial heterojunctions" concept, characteristics, mechanism, and extension are proposed at an atomic-/nanoscale to clarify the generation of rational heterojunctions as well as the cascade electron transfer. |
| Databáze: | OpenAIRE |
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