Journal
NANO ENERGY
Volume 19, Issue -, Pages 446-454Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.10.011
Keywords
g-C3N4 quantum dots; TiO2-NTAs; Photoelectrocatalytic; H-2 evolution; Pollutant degradation
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Funding
- National Natural Science Foundation of China [21207090, 21477079, 21237003]
- Shanghai Government [11SG42, 11ZR1426300, 12PJ1406800, 13YZ054, 14ZR1430900]
- PCSIRT [IRT1269]
- Doctoral Program by Higher Education [2012312712009]
- Shanghai Normal University [DXL122, S30406]
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Size-controllable g-C3N4 quantum dots (QDs) were in-situ synthesized and grafted onto single crystalline TiO2 nanotube arrays (TiO2-NTAs) based on nanotube-confinement effect. This photoelectrocatalyst exhibited high activity in synergetic H-2 evolution and organic pollutant degradation. The g-C3N4 QDs, together with TiO2-NTAs due to multiple light reflections, promoted light harvesting owing to the narrow energy band gap and upconversion from quantum size effect of g-C3N4 QDs. Meanwhile, the single-crystal TiO2 in-situ formed during the g-C3N4 synthesis process favored the photoelectron transfer, and the g-C3N4/TiO2 heterojunctions further promoted separation of photoelectrons from holes. Moreover, the strong g-C3N4-TiO2 interaction and the confinement effect of TiO2 nanotubes efficiently inhibited self-gathering and leaching of g-C3N4 QDs, leading to excellent stability in photoelectrocatalysis. (C) 2015 Elsevier Ltd. All rights reserved.
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