Morphological tuning of photo-booster g-C3N4 with higher surface area and better charge transfers for enhanced power conversion efficiency of quantum dot sensitized solar cells

Ansari, Mohammad Shaad; Banik, Avishek; Qureshi, Mohammad

doi:10.1016/j.carbon.2017.05.075

Cited by 39 publications

(17 citation statements)

References 64 publications

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“…are summarized in Table S1. The average lifetime values are derived from equation ⟨τ a ⟩ (ns) = ( A 1 τ 1 2 )/( A 1 τ 1 ) . Here, only τ 1 is caused due to free exciton’s recombination in the photocatalyst, and other exciton lifetimes such as τ 2 and τ 3 are not observed, which are generated due to the nonradiative recombination at the semiconductor surface.…”

Section: Resultsmentioning

confidence: 99%

“…The average lifetime values are derived from equation ⟨τ a ⟩ (ns) = (A 1 τ 1 2 )/(A 1 τ 1 ). 53 Here, only τ 1 is caused due to free exciton's recombination in the photocatalyst, and other exciton lifetimes such as τ 2 and τ 3 are not observed, which are generated due to the nonradiative recombination at the semiconductor surface. The average lifetimes of g-C 3 N 4 , TS-1, and TCN(1-8-8) have been found to be 0.69, 0.75, and 0.52 ns, respectively (Figure 3d).…”

Section: ■ Introductionmentioning

confidence: 87%

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Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

2018

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Here, we present the integration of a commercially available titanosilicate zeolite with photocatalyst graphitic carbon nitride (g-C3N4) toward the development of an effective heterojunction photocatalyst, TCN(1-8-8). The formation of this porous heterojunction and its structural details have been confirmed by X-ray diffraction, N2 adsorption, electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The visible light absorption and band structure have been determined from diffused reflectance ultraviolet–visible spectroscopy. For its fabrication, the contents of both the constituent materials have been optimized systematically. Its photocatalytic activity has been found to be impressive in the visible light-assisted degradation of a variety of water pollutants (dyes and antibiotics) and in the hydroxylation of phenol. Control experiments, radical scavenging/trapping experiments, influence of the reaction environment, and photoelectrochemical measurements have been carried out to establish the structure–activity relationship and the plausible reaction mechanisms. The various fragmented products, formed during the degradation of parent molecules, have been further confirmed using electrospray ionization mass spectrometry analysis. The photocatalytic degradation of 98, 96, 95, and 92%; rate constants of 0.0125, 0.01244, 0.0058, and 0.0040 min–1; and reduction of total organic concentrations of 63, 59, 57, and 55% for rhodamine B, sulforhodamine B, tetracycline, and ciprofloxacin have been achieved in 6 h, respectively. The activity of TCN(1-8-8) has been observed to be better than the state-of-the-art photocatalyst TiO2 (Degussa P25). Besides, it has also exhibited excellent degradation activity in natural solar light. The effective adsorption of pollutant molecules over the active surface, efficient charge separation at the interface, migration and retardation of charge carriers recombination process, and tailored charge-carrier dynamics in the excited state have all been identified as reasons for the higher activity. This study, therefore, provides a comprehensive and systematic grasp on the development of an economical catalyst for photocatalytic hydroxylation reaction and wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 87%

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

2018

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“…EIS for the DSSCs typically explicates the characteristic charge transfers occurring at various interfaces in different frequency regions, viz., at the CE/electrolyte interface (1–100 kHz) and at the semiconductor/electrolyte interface (0.1–1 kHz), and the diffusion of electrolyte (0.1–0.01 kHz). 59,73…”

Section: Results and Discussionmentioning

confidence: 99%

Efficient Energy Harvesting in SnO₂-Based Dye-Sensitized Solar Cells Utilizing Nano-Amassed Mesoporous Zinc Oxide Hollow Microspheres as Synergy Boosters

2018

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Finding the material characteristics satisfying most of the photovoltaic conditions is difficult. In contrast, utilization of foreign materials that can contribute to light harvesting and charge transfers in the devices is now desirable/thought-provoking. Herein, a binary hybrid photoanode utilizing nano-amassed micron-sized mesoporous zinc oxide hollow spheres (meso-ZnO HS) in conjunction with SnO 2 nanoparticles (NPs), i.e., SnO 2 NP_ZnO HS (for an optimized weight ratio (8:2)), displayed a nearly ∼4-fold increase in the efficiency (η) compared to that of bare SnO 2 nanoparticle device. Enhanced device efficacy in the composite photoanode-based device can be accredited to the dual function of nano-amassed meso-ZnO HS. Nano-amassed micron-sized ZnO HS embedded in the photoanode can increase the light-harnessing capability without sacrificing the surface area as well as optical confinement of light by multiple reflections within its cavity and enhanced light-scattering effects. Electrochemical impedance spectroscopy analysis revealed an extended lifetime of electron (τ e ) and a higher value of R ct2 at the working electrode/dye/redox mediator interface, indicating a minimum photoinduced electron interception. The open-circuit voltage decay reveals a slower recombination kinetics of photogenerated electrons, supporting our claim that the nano-ammased meso-ZnO HS can serve as an energy barrier to the photoinjected electrons to retard the back-transfer to the electrolyte. Moreover, the improvement in the fill factors of the composite-based devices is endorsed to the facile penetration of the electrolyte through the pores of nano-amassed meso-ZnO HS, which increases the regeneration probability of oxidized dyes.

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“…5c). 47,[55][56][57] However, the spectrum of BiVO 4 indicates that it has better charge separation ability than S-CN ( Fig. 5c).…”

Section: Physico-chemical Propertiesmentioning

confidence: 99%

Unraveling the impact of the Pd nanoparticle@BiVO₄/S-CN heterostructure on the photo-physical & opto-electronic properties for enhanced catalytic activity in water splitting and one-pot three-step tandem reaction

2019

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Morphological tuning of photo-booster g-C3N4 with higher surface area and better charge transfers for enhanced power conversion efficiency of quantum dot sensitized solar cells

Cited by 39 publications

References 64 publications

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

Efficient Energy Harvesting in SnO₂-Based Dye-Sensitized Solar Cells Utilizing Nano-Amassed Mesoporous Zinc Oxide Hollow Microspheres as Synergy Boosters

Unraveling the impact of the Pd nanoparticle@BiVO₄/S-CN heterostructure on the photo-physical & opto-electronic properties for enhanced catalytic activity in water splitting and one-pot three-step tandem reaction

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Morphological tuning of photo-booster g-C3N4 with higher surface area and better charge transfers for enhanced power conversion efficiency of quantum dot sensitized solar cells

Cited by 39 publications

References 64 publications

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

Efficient Energy Harvesting in SnO2-Based Dye-Sensitized Solar Cells Utilizing Nano-Amassed Mesoporous Zinc Oxide Hollow Microspheres as Synergy Boosters

Unraveling the impact of the Pd nanoparticle@BiVO4/S-CN heterostructure on the photo-physical & opto-electronic properties for enhanced catalytic activity in water splitting and one-pot three-step tandem reaction

Contact Info

Product

Resources

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Efficient Energy Harvesting in SnO₂-Based Dye-Sensitized Solar Cells Utilizing Nano-Amassed Mesoporous Zinc Oxide Hollow Microspheres as Synergy Boosters

Unraveling the impact of the Pd nanoparticle@BiVO₄/S-CN heterostructure on the photo-physical & opto-electronic properties for enhanced catalytic activity in water splitting and one-pot three-step tandem reaction