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J Colloid Interface Sci. 2018 Nov 1;529:396-403. doi: 10.1016/j.jcis.2018.06.040. Epub 2018 Jun 19.

Role of carbon quantum dots in titania based photoelectrodes: Upconversion or others?

Author information

1
School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, PR China.
2
School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, PR China; School of Chemistry, Beihang University, Beijing 100191, PR China.
3
School of Chemistry, Beihang University, Beijing 100191, PR China; Center for Green Innovation, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, PR China. Electronic address: zhengjinlong@buaa.edu.cn.

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 TiO2/CdS/C photoelectrodes for photoelectrochemical hydrogen evolution. The role of the CQDs was investigated based on the TiO2/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.

KEYWORDS:

Carbon quantum dots; Hydrogen evolution; Photoelectrochemistry; Synergistic effect; Upconversion

PMID:
29940322
DOI:
10.1016/j.jcis.2018.06.040

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