Photocurrent enhancement of the CdS/TiO 2 /ITO photoelectrodes achieved by controlling the deposition amount of Ag 2 S nanocrystals

Chen, Chong; Zhai, Yujia; Ling, Lanyu

doi:10.1016/j.apsusc.2015.08.134

Cited by 6 publications

(3 citation statements)

References 49 publications

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“…The photoelectric properties of particles were further investigated by EIS, and the Nyquist plots (Figure 6d) were used to analyze the impedance spectra. In the Nyquist plots, the imaginary component usually represents the capacitive parameter, the real component represents the ohmic parameter, 70 and the radius of the semicircle is related to the charge transfer resistance. 71 The impedance data were fitted to the equivalent circuit (Figure 6d), which included the solution resistance (R s ), charge-transfer resistance (R 1 ), and capacitance (C 1 ).…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Zhu

Guo

et al. 2018

Ind. Eng. Chem. Res.

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TiO 2 pigments are widely used in paint industries. Inert coating layers were usually deposited on the TiO 2 pigments to suppress the photocatalytic activity of TiO 2 , which can prevent the degradation of surrounding polymer molecules. However, the traditional wet chemical methods normally form thick films, which would impair the pigment properties of TiO 2 . In this work, SnO 2 and SiO 2 protective layers were grown on the TiO 2 particle surface by lowtemperature pulsed chemical vapor deposition. At temperatures <60 °C, thin and uniform amorphous SnO 2 films were obtained. The photocatalytic activities of both TiO 2 /SnO 2 and TiO 2 /SiO 2 core−shell particles were suppressed, and TiO 2 /SnO 2 core− shell particles showed higher lightening power than TiO 2 /SiO 2 . According to transient fluorescence, photocurrent, and electrochemical impedance spectroscopy measurements, the low electron mobility of amorphous SnO 2 and SiO 2 films led to fast recombination of photogenerated electrons and holes, thus preventing their migration to the surface and suppressing the photocatalytic activity of TiO 2 .

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Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Zhu

Guo

et al. 2018

Ind. Eng. Chem. Res.

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“…Many attempts have been made to enhance the photocatalytic activity of TiO 2 under illumination conditions similar to solar light 12 , 13 . These include doping transition metal ions such as Fe 3+ 14 , 15 , Ni 2+ & Ti 3+ 16 , Ti 3+ -doped TiO 2 17 , 18 or nonmetal atoms such as N, F and S 19 – 21 , dye-sensitization 22 – 24 , and coupling with a photosensitizer such as g-C 3 N 4 25 , MFe 2 O 4 26 , α-Fe 2 O 3 , Au, Pt and Au/Pt co-catalysts 27 – 29 , CdS 30 , 31 , MoS 2 @zeolite 32 , Ag 33 and Ag 3 PO 4 34 , 35 . The purpose of coupling with a photosensitizer is to enhance the visible-light harvesting and promote charge separation by effective interface charge transfer between the photosensitizer and TiO 2 for which the relative position of the energy band levels are critical.…”

Section: Introductionmentioning

confidence: 99%

Photosensitization of TiO2 nanofibers by Ag2S with the synergistic effect of excess surface Ti3+ states for enhanced photocatalytic activity under simulated sunlight

Ghafoor

Ata

Mahmood

et al. 2017

Sci Rep

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TiO2 nanofibers, with mean diameter ~200 nm, were fabricated by electrospinning and successfully photosensitized with low bandgap Ag2S nanoparticles of 11, 17, 23 and 40 nm mean sizes, with corresponding loading of 4, 10, 18 and 29 wt.% Ag2S, respectively. 17 nm Ag2S@TiO2 nanofibers exhibited optimal activity in the photodegradation of methylene blue under simulated sunlight with pseudo-first order rate constant of 0.019 min−1 compared to 0.009 min−1 for pure TiO2 nanofibers. In spite of greater visible-light absorption and reduced bandgap, larger than 17 nm Ag2S nanoparticles exhibited sluggish photodegradation kinetics probably due to less photo-induced carriers generation in TiO2 and reduced electron injection rates from the larger sized Ag2S into TiO2. Furthermore, a UV-O3 surface treatment induced excess Ti3+ surface states and oxygen vacancies which synergistically enhanced the photodegradation rate constant to 0.030 min−1 for 17 nm Ag2S@TiO2 sample which is ~70% better than the previously reported for Ag2S/TiO2 hierarchical spheres. This was attributed to the efficient charge separation and transfer driven by increased visible-light absorption, bandgap narrowing and reduced electron-hole recombination rates. The present study demonstrate the potential utilization of Ag2S@TiO2 nanofibers in filtration membranes for removal of organic pollutants from wastewater.

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“…However, it is known that the TiO 2 mainly absorbs the ultraviolet light due to its large band gap of 3.2 eV. Therefore, various types of quantum dots (QDs) with different optical absorption properties, such as CdS [5–7], CdTe [8–10], CdSe [4, 11–14], PbS [15, 16], PbSe [17], and CuInS 2 [3, 18], have been synthesized to sensitize the TiO 2 in order to extend the light absorption of the TiO 2 into the visible region. To further increase the light absorption of QD-sensitized TiO 2 , increasing the loading amount of QDs through the improvement of the TiO 2 photoelectrode structures is an effective way.…”

Section: Introductionmentioning

confidence: 99%

Double-Sided Transparent TiO2 Nanotube/ITO Electrodes for Efficient CdS/CuInS2 Quantum Dot-Sensitized Solar Cells

Chen

Ling

2017

Nanoscale Res Lett

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In this paper, to improve the power conversion efficiencies (PCEs) of quantum dot-sensitized solar cells (QDSSCs) based on CdS-sensitized TiO2 nanotube (TNT) electrodes, two methods are employed on the basis of our previous work. First, by replacing the traditional single-sided working electrodes, double-sided transparent TNT/ITO (DTTO) electrodes are prepared to increase the loading amount of quantum dots (QDs) on the working electrodes. Second, to increase the light absorption of the CdS-sensitized DTTO electrodes and improve the efficiency of charge separation in CdS-sensitized QDSSCs, copper indium disulfide (CuInS2) is selected to cosensitize the DTTO electrodes with CdS, which has a complementary property of light absorption with CdS. The PCEs of QDSSCs based on these prepared QD-sensitized DTTO electrodes are measured. Our experimental results show that compared to those based on the CdS/DTTO electrodes without CuInS2, the PCEs of the QDSSCs based on CdS/CuInS2-sensitized DTTO electrode are significantly improved, which is mainly attributed to the increased light absorption and reduced charge recombination. Under simulated one-sun illumination, the best PCE of 1.42% is achieved for the QDSSCs based on CdS(10)/CuInS2/DTTO electrode, which is much higher than that (0.56%) of the QDSSCs based on CdS(10)/DTTO electrode.

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Photocurrent enhancement of the CdS/TiO 2 /ITO photoelectrodes achieved by controlling the deposition amount of Ag 2 S nanocrystals

Cited by 6 publications

References 49 publications

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Photosensitization of TiO2 nanofibers by Ag2S with the synergistic effect of excess surface Ti3+ states for enhanced photocatalytic activity under simulated sunlight

Double-Sided Transparent TiO2 Nanotube/ITO Electrodes for Efficient CdS/CuInS2 Quantum Dot-Sensitized Solar Cells

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Photocurrent enhancement of the CdS/TiO 2 /ITO photoelectrodes achieved by controlling the deposition amount of Ag 2 S nanocrystals

Cited by 6 publications

References 49 publications

Suppression of TiO2 Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO2 Protective Layer

Suppression of TiO2 Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO2 Protective Layer

Photosensitization of TiO2 nanofibers by Ag2S with the synergistic effect of excess surface Ti3+ states for enhanced photocatalytic activity under simulated sunlight

Double-Sided Transparent TiO2 Nanotube/ITO Electrodes for Efficient CdS/CuInS2 Quantum Dot-Sensitized Solar Cells

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Product

Resources

About

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer