Chalcogenide photosensitized titania nanotube arrays

Tzeng, Wei-Jei; Wu, Mei-Lun; Lin, Li-Jiaun; Chang, Horng‐Yi

doi:10.1016/j.jallcom.2015.08.140

Cited by 7 publications

(1 citation statement)

References 41 publications

(27 reference statements)

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“…Compared with the EIS performed under dark conditions, we can tell that the charge-transfer resistance of the NCDs/TiO 2 electrode decreased faster by light illumination compared with pristine TiO 2 . This proves that NCDs provided photosensitized electrons to TiO 2 and separated the electron–hole pairs more efficiently, thereby decreasing the impedance under light . Additionally, the Mott–Schottky (M–S) plot measured at 10 kHz reveals a higher carrier density after NCD deposition (Figure h) from the smaller slope of the NCD/TiO 2 curve. , To minimize the effect of surface state capacitance and the double-layer capacitance at the electrode/electrolyte interface, the frequency of the M–S measurements was chosen to be fast enough to limit the effective filling and unfilling of the electrodes’ surface state, as well as restrain the building up of the double-layer capacitance.…”

Section: Results and Discussionmentioning

confidence: 99%

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation

Luo

Dimitrov

Dabóczi

et al. 2020

ACS Appl. Nano Mater.

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Carbon dots on photoactive semiconductor nanomaterials have represented an effective strategy for enhancing their photoelectrochemical (PEC) activity. By carefully designing and manipulating carbon dots/support composite, a high photocurrent could be obtained. Currently, there is not much fundamental understanding of how the interaction between such materials can facilitate the reaction process. This hinders the wide applicability in PEC devices. To address this need of improving the fundamental understanding of carbon dots/semiconductor nanocomposite, we have taken the TiO 2 case as a model semiconductor system with nitrogen-doped carbon dots (NCDs).We present here with in-depth investigation of the structural hybridization and energy transitions in the NCDs/TiO 2 photoelectrode via high-resolution scanning transmission microscopy (HR-STEM), electron energy loss spectroscopy (EELS), UV-Vis absorption, electrochemical impedance spectroscopy (EIS), Mott-Schottky (M-S), time-correlated single photon counting (TCSPC) and ultra-violet photoelectron spectroscopy (UPS), which shed some light on the charge transfer process at the carbon dots and TiO 2 interface. We show that N doping in carbon dots can effectively prolong the carrier lifetime, and the hybridisation of NCDs and TiO 2 is able not only to extend TiO 2 light response into the visible range but also to form heterojunction at the NCDs/TiO 2 interface with properly aligned band structure that allows a spatial separation of the charges. This work is arguably the first to report the direct probing of the band positions of carbon dots-TiO nanoparticle composite in a PEC system for understanding the energy transfer mechanism, demonstrating the favourable role of NCDs in the photocurrent response of TiO 2 for water oxidation process. This study reveals the importance of combining structural, photophysical and electrochemical experiments to develop a comprehensive understanding of the nanoscale charge transfer processes between the carbon dots and their catalyst supports.

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Section: Results and Discussionmentioning

confidence: 99%

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation

Luo

Dimitrov

Dabóczi

et al. 2020

ACS Appl. Nano Mater.

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Influence of Sn, in on ac electrical conductivity and dielectric relaxation behavior of Se–Te chalcogenide glass films

et al. 2022

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Preparation of novel TiO 2 quantum dot blocking layers at conductive glass/TiO 2 interfaces for efficient CdS quantum dot sensitized solar cells

Zhang

Lan

et al. 2016

Journal of Alloys and Compounds

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Chalcogenide photosensitized titania nanotube arrays

Cited by 7 publications

References 41 publications

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation

Influence of Sn, in on ac electrical conductivity and dielectric relaxation behavior of Se–Te chalcogenide glass films

Preparation of novel TiO 2 quantum dot blocking layers at conductive glass/TiO 2 interfaces for efficient CdS quantum dot sensitized solar cells

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Chalcogenide photosensitized titania nanotube arrays

Cited by 7 publications

References 41 publications

Nitrogen-Doped Carbon Dots/TiO2 Nanoparticle Composites for Photoelectrochemical Water Oxidation

Nitrogen-Doped Carbon Dots/TiO2 Nanoparticle Composites for Photoelectrochemical Water Oxidation

Influence of Sn, in on ac electrical conductivity and dielectric relaxation behavior of Se–Te chalcogenide glass films

Preparation of novel TiO 2 quantum dot blocking layers at conductive glass/TiO 2 interfaces for efficient CdS quantum dot sensitized solar cells

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Product

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About

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation

Nitrogen-Doped Carbon Dots/TiO₂ Nanoparticle Composites for Photoelectrochemical Water Oxidation