Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Das, Tapan Kumar; Ilaiyaraja, P.; Mocherla, Pavana S. V.; Bhalerao, G. M.; Sudakar, C.

doi:10.1016/j.solmat.2015.08.036

Cited by 77 publications

(29 citation statements)

References 69 publications

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“…B 1g (2) , and 642 cm -1 for E g(2) [28]. The rutile phase is readily identified by the most intense rutile Raman modes at *448 cm -1 for E g and 612 cm -1 for A 1g [29,30], as shown in the inset of Fig. 3.…”

Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 84%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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The sintered TiO 2 nanofilms were immersed in the aqueous solution of graphite oxide and then were thermally reduced to reduced graphene oxide (RGO), resulting in RGO-doped TiO 2 photoanodes employed in the dye-sensitized solar cells (DSSCs). This preparation method for the reduced graphene oxide-TiO 2 (RGO-TiO 2 ) photoanode could avoid the loss of RGO during the sintering process. The presence of RGO in the photoanodes was confirmed using Raman analysis, scanning electron microscopy, transmission electron microscopy, and energy-dispersive spectrometer. The amount of RGO in photoanode was obtained by thermo-gravimetric analysis. Other techniques such as X-ray diffraction, Brunauer-Emmett-Teller, electron energy loss spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the composite materials of RGO-TiO 2 . The J-V measurement of RGO-TiO 2 -based DSSCs showed that the best photoelectric conversion efficiency (g) of 6.85% is 11.7% higher than that of the pure TiO 2 (P25-TiO 2 )-based DSSCs. It was shown that RGO in the photoanode could facilitate the phase transition in TiO 2 crystals (from anatase to rutile) resulting in the mixed crystals in the photoanodes. The existence of RGO and mixed-crystal structure of TiO 2 changed the electronic transmission pathway, reduced the recombination rate of electron-hole pairs, and thus improved the g of DSSCs.

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Section: Characterization Of Rgo-tio 2 Photoanodementioning

confidence: 84%

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

et al. 2017

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“…Apart from the surface phenomena, bulk characteristics of defective Titania like superficial and deep defect states offer a dominant pathway for charge transport [148][149][150][151][152][153][154][155][156][157][158]. Also, defective Titania absorbs visible light, and the defect concentration tunes their optical behavior [159][160][161][162]. Importantly, defective Titania possesses numerous dangling bonds and serve as a bridge to facilitate charge transfer once it is photo-excited.…”

Section: Role Of Defects Towards Photoelectrochemical Water Splittingmentioning

confidence: 99%

Switchable Intrinsic Defect Chemistry of Titania for Catalytic Applications

Swaminathan

Ashokkumar

2018

Catalysts

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The energy crisis is one of the most serious issue that we confront today. Among different strategies to gain access to reliable fuel, the production of hydrogen fuel through the water-splitting reaction has emerged as the most viable alternative. Specifically, the studies on defect-rich TiO2 materials have been proved that it can perform as an efficient catalyst for electrocatalytic and photocatalytic water-splitting reactions. In this invited review, we have included a general and critical discussion on the background of titanium sub-oxides structure, defect chemistries and the consequent disorder arising in defect-rich Titania and their applications towards water-splitting reactions. We have particularly emphasized the origin of the catalytic activity in Titania-based material and its effects on the structural, optical and electronic behavior. This review article also summarizes studies on challenging issues on defect-rich Titania and new possible directions for the development of an efficient catalyst with improved catalytic performance.

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“…9). The diffuse reflectance can be converted into absorption coefficient equivalent using Kubelka-Munk function, F(R), as represented below [49] where, F(R) is the Kubelka-Munk function of the sample and R is the reflectance of the sample. In the parabolic band structure, the Eg and absorption coefficient are related through the well-known Tauc relation [50].…”

Section: Xps Analysismentioning

confidence: 99%

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

et al. 2019

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In this study, the photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solution using 1 wt% Cu/ZnO photocatalyst in presence of ethylenediaminetetraacetic acid (EDTA) under UV irradiation was investigated. The photocatalytic Cr(VI) reduction with ZnO under UV irradiation was significantly low. A fast Cr(VI) reduction with ZnO was recorded in presence of EDTA. Results demonstrated that the rate constant raised from 1.6 × 10 −2 to 7.5 × 10 −2 min −1 with 20 ppm EDTA addition. The optimum reduction (90%) was observed within 30 min at pH 3. The reduction efficiency of Cr(VI) was evidently increased from 6% to 99%, with increasing ZnO dosages up to 40 mg. The role of co-catalysts such as Au, Ag, Cu and NiO was also studied. The addition of Cu ion remarkably accelerated the reduction of Cr(VI), compared with ZnO/ EDTA system alone. The Cu motivated ZnO/EDTA system completed the 99% reduction within only 30 min. The Cu ions were reduced to metallic copper and Cu 2 O by conduction band electrons of ZnO. The electron-hole recombination was gently declined by the shallow electron trapping of Cu. On the other hand, EDTA could be performed in two ways by forming Cr(III)-complex and separating Cr(III) from ZnO surface and by consuming valence band holes. The Cu modified ZnO photocatalyst was characterized by N 2 adsorption-desorption isotherm, TEM, EDX, XPS, DRS and PL spectra. We evaluated the influence of pH, photocatalyst dosage, initial concentration of EDTA and initial concentration of Cu 2+ ion (Cu doping amount) on photocatalytic reduction of Cr(VI). The pseudo first order kinetic reaction was confirmed for this reduction process. Herein, a probable mechanism of this photocatalytic reduction process was also presented.

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Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Cited by 77 publications

References 69 publications

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

A detailed investigation on the performance of dye-sensitized solar cells based on reduced graphene oxide-doped TiO2 photoanode

Switchable Intrinsic Defect Chemistry of Titania for Catalytic Applications

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

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