1. Role of carbon quantum dots in titania based photoelectrodes: Upconversion or others?
- Author
-
Zhou, Jing, Chen, Jiangchun, Zheng, Jinlong, Yan, Bingyi, Zhou, Yan, Hou, Bingdong, and Chen, Buyang
- Subjects
- *
QUANTUM dots , *PYROLYSIS , *QUANTUM wells , *CHEMICAL reactions , *PHOTOLUMINESCENCE - Abstract
Carbon quantum dots (CQDs) were synthesized by a facile and green pyrolysis method. The as-prepared CQDs show wide light absorption, tunable downconversion photoluminescence (PL) properties and excellent “upconversion” luminescence properties. CQDs were used to design the TiO 2 /CdS/C photoelectrodes for photoelectrochemical hydrogen evolution. The role of the CQDs was investigated based on the TiO 2 /CdS/C photoelectrodes. The results reveal that CQDs can enhance light-harvesting efficiency and improve their charge separation and transfer properties when coupled with conventional QD-sensitized photoelectrodes. Nevertheless, the contribution of “upconversion” luminescence of CQDs to the enhanced photoelectrochemical performance is negligible. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF