Effect of TiO2 modification on urchin-like orthorhombic Nb2O5 nanospheres as photoelectrodes in dye-sensitized solar cells

Chu, Liang; Liu, Wei; Yu, Aiai; Qin, Zhengfei; Hu, Ruiyuan; Shu, Huazhong; Luo, Qiang; Min, Yonggang; Yang, Jianping; Li, Xing’ao

doi:10.1016/j.solener.2017.03.091

Cited by 16 publications

(6 citation statements)

References 32 publications

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“…Underlying the background, many other oxide semiconductors with high electron transport properties have been considered and found to be promising. For instance, ZnO, Zn 2 SnO 4 , SnO 2 and Nb 2 O 5 have already been demonstrated as applicable materials for photoanodes [8,9,10,11,12]. In particular, ZnO has attracted widespread attention due to many remarkable advantages, such as suitable energy band position for effective electron-injection from the sensitizer and higher electron mobility (205–1000 cm 2 ·V −1 ·s −1 ) in comparison with TiO 2 (0.1–4 cm 2 ·V −1 ·s −1 ) that enables faster electron transport within the photoanode film.…”

Section: Introductionmentioning

confidence: 99%

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Wang

Zhang

et al. 2019

Nanomaterials

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A facile one-pot approach was developed for the synthesis of ZnO nanorods (NRs)/nanoparticles (NPs) architectures with controllable morphologies. The concrete state of existence of NPs and NRs could rationally be controlled through reaction temperature manipulation, i.e., reactions occured at 120, 140, 160, and 180 °C without stirring resulted in orderly aligned NRs, disordered but connected NRs/NPs, and relatively dispersed NRs/NPs with different sizes and lengths, respectively. The as-obained ZnO nanostructures were then applied to construct photoanodes of dye-sensitized solar cells, and the thicknesses of the resultant films were controlled for performance optimization. Under an optimized condition (i.e., with a film thickness of 14.7 µm), the device fabricated with the material synthesized at 160 °C exhibited the highest conversion efficiency of 4.30% with an elevated current density of 14.50 mA·cm−2 and an open circuit voltage of 0.567 V. The enhanced performance could be attributed to the coordination effects of the significantly enhanced dye absorption capability arising from the introduced NPs and the intrinsic fast electron transport property of NRs as confirmed by electrochemical impedance spectroscopy (EIS) and ultraviolet–visible (UV−vis) absorption.

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Section: Introductionmentioning

confidence: 99%

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Wang

Zhang

et al. 2019

Nanomaterials

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“…Performance comparison of dye sensitized solar cells for individuals and cocktail dye sensitized various photoanodes. spectrum and other peak are also observed at around 232 and 126 cm[35][36][37][38] which further confirm that Nb O is orthorhombic.…”

mentioning

confidence: 65%

Efficiency Enhancement for Cocktail Dye Sensitized Nb2O5 Photoanode Towards Dye Sensitized Solar Cell

Beedri¹,

Baviskar²,

Mahadik³

et al. 2019

Eng. Sci.

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In present report, we have developed Nb O photoelectrode sensitized with cocktail dye as sensitizer towards enhancement in efficiency. The 2 5 absorbance spectrum of pristine organic dyes viz. coumarin 343 (C343) and mercurochrome (MC) along with mixture of C343 and MC (cocktail) dye was recorded using UV-visible spectroscopy. The performances of Nb O based photoanode were characterized using photocurrent 2 5 density-voltage (J-V) measurement and the comparison of output photovoltaic performance for C343, MC and cocktail dye were discussed in detailed. Cocktail dye sensitization shows enhancement in short-circuit current density (J) due to the complementary absorption of the two sc pristine sensitizers. The value of open circuit voltage (V) for device sensitized using cocktail dye comes between the individual V for pristine oc oc dye sensitized devices. Electrochemical impedance spectroscopy (EIS) was studies to understand the charge transfer. Based on EIS measurements, the increased efficiency value of the solar cell with the cocktail dye sensitized photoanode can be attributed to suppression of charge recombination at Nb O |dye|electrolyt interfaces and enhancement of electron transport in the photoanode along with the longer electron 2 5 lifetime. The overall conversion efficiency reaches 0.70% for cocktail dye sensitized device.

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“…XRD pattern obtained for synthesized samples are shown in Figure 1‐A, all samples show the main contribution at 22.8° and 46.7° from (001) and (002) diffraction plane assigned to the orthorhombic phase of Nb 2 O 5 (pattern 00–027‐1003 PDF database) respectively [39,48,49] . Different H 2 O : EtOH rates during hydrothermal synthesis resulted in different crystalline behavior.…”

Section: Resultsmentioning

confidence: 99%

Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

Rojas,

Rafaela,

Espinoza‐Villalobos

et al. 2024

ChemSusChem

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The photocatalytic conversion in aqueous media of phenol and guaiacol as a lignin model compound using Nb2O5 with different crystal phases was studied. Nb2O5 particles were synthesized using hydrothermal methods, where it was observed that changes in the solvent control their morphology and crystal phase. Different photocatalytic behavior of Nb2O5 was observed with the selected model compounds, indicating that its selection directly impacts the resulting conversion and selectivity rates as well as the reaction pathway, highlighting the relevance of model molecule selection. Photocatalytic conversion of phenol showed conversion rate (C%) up to 25% after 2 h irradiation and high selectivity (S%) to pyrogallol (up to 50%). Orthorhombic Nb2O5 spheres favored conversion through free hydroxyl radicals while monoclinic rods did not convert phenol. Guaiacol photocatalytic oxidation showed high conversion rate but lower selectivity. Orthorhombic and monoclinic Nb2O5 favored the formation of resorcinol with S%~0.43% (C%~33%) and ~13% (C%~27%) respectively. The mixture of both phases enhanced the guaiacol conversion rate to ~55% with ~17% of selectivity to salicylaldehyde. The use of radical scavengers provided information to elucidate the reaction pathway for these model compounds, showing that different reaction pathways may be obtained for the same photocatalyst if the model compound is changed.

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Effect of TiO2 modification on urchin-like orthorhombic Nb2O5 nanospheres as photoelectrodes in dye-sensitized solar cells

Cited by 16 publications

References 32 publications

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Efficiency Enhancement for Cocktail Dye Sensitized Nb2O5 Photoanode Towards Dye Sensitized Solar Cell

Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

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Effect of TiO2 modification on urchin-like orthorhombic Nb2O5 nanospheres as photoelectrodes in dye-sensitized solar cells

Cited by 16 publications

References 32 publications

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Design of Morphology-Controllable ZnO Nanorods/Nanopariticles Composite for Enhanced Performance of Dye-Sensitized Solar Cells

Efficiency Enhancement for Cocktail Dye Sensitized Nb2O5 Photoanode Towards Dye Sensitized Solar Cell

Role of Nb2O5 Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products

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Product

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Role of Nb₂O₅ Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value‐Added Products