Tailoring of nanoporous TiO2 spheres with 100–200 nm sizes for efficient dye-sensitized solar cells

Yu, Sora; You, Ji Su; Yang, In Seok; Kang, Paul; Rawal, Sher Bahadur; Sung, Sang Do; Lee, Wan In

doi:10.1016/j.jpowsour.2016.06.018

Cited by 20 publications

(9 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further increasing the water amount up to 5.0 mL, some submicrospheres would be aggregated, which can be attributed to the faster hydrolysis rate and too much nucleation amount formation. [22,23] Figure 3 shows the XRD patterns of MTS-W-X samples.All the diffraction peaks corresponding to the pure anatase phase of TiO 2 samples (JCPDS No.21-1272) [24] were observed from the XRD patterns shown in Figure 3 and the intensities would be promoted with the water amount increasing from 0.6 to 1.3 mL. However, when the water amount further increased beyond 1.6 mL, crystal transformation of the submicrospheres would be occurred because some rutile TiO 2 phase would be formed resulting in the decrease of the anatase TiO 2 crystal-linity.…”

Section: Resultsmentioning

confidence: 99%

“…[22] In addition, too fast hydrolysis rate will lead to insufficient spherical forming time, which will lead to poor homogeneity and even the failure of microspheres. [23] At the same time, controllable hydrolysis rate for two and more precursors would be essential to the heteroatoms incorporation into the other carrier and be beneficial to the formation of submicrosphere. Therefore, the water amount in the initial preparation solutions is the key factor to regulate the submicrospheres size, and no relative literatures focused on its effect in the catalytic performance in the BÀ V oxidation reaction of cyclohexanone by molecular oxygen have been reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Zhou

Sun

et al. 2022

ChemistrySelect

View full text Add to dashboard Cite

Sn-Ti submicrospheres with tunable particle size were successfully synthesized by adjusting the water amount over Polyvinylpyrrolidone(PVP)-assisted sol-gel method in this paper, and the effect of the submicrosphere size on the catalytic performance in the B-V oxidation of cyclohexanone by molecular oxygen was also investigated. Their physical and chemical properties were character-rized by Scanning electron microscope (SEM), X-ray diffraction (XRD), N 2 sorption, Pyridineadsorbed IR(Py-IR), Uvioletvisible diffuse reflection spectroscopy(UV-vis), X-ray photoelectron spectra (XPS), Transmission electron microscope and Energy dispersive X-ray detector(TEM-EDX) techniques. The characterization results showed that the Sn-Ti crystal phase would be affected by the initial water amount resulting in the variation for the incorporation of tin species into the tetrahedral TiO 2 . The regular Sn-Ti submicrospheres with particle size about 210 � 5 nm and typical Lewis acidities for MTS-W-4.0 sample can be obtained when water amount was as high as 4.0 mL, and it exhibited higher catalytic performance than other catalysts where its εcaprolactone yield was 97.8 %. Compared to the decline range of 13.6 % with the submicrospheres particle size as about 450 nm, the drop of ε-caprolactone yield was only 3.9 % and the yield of ε-caprolactone can be kept at 93.9 % over MTS-W-4.0 sample after repeated use for 5 times.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Zhou

Sun

et al. 2022

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…With the advantages of excellent stability and wide band gap, semiconductors, such as TiO 2 and ZnO, have been widely utilized as PV materials in DSSCs . Appropriate size of the semiconductors is necessary for a high‐efficiency DSSC, and they should be neither too large with a small surface area for light harvesting, nor too small without suitable pores for electron transport and solar light scattering on the basis of the Mie theory . As a promising method to improve the efficiency of DSSCs, the introduction of metal nanoparticles (NPs) can accelerate the localized surface plasmon resonance (LSPR)‐induced hot electrons transferring and enhance the utilization of solar light .…”

Section: Figurementioning

confidence: 99%

“…[8,9] Appropriate size of the semiconductors is necessary for ah igh-efficiency DSSC,a nd they should be neither too large with asmall surface area for light harvesting,n or too small without suitable pores for electron transport and solar light scattering on the basis of the Mie theory. [10,11] As ap romising method to improve the efficiency of DSSCs,t he introduction of metal nanoparticles (NPs) can accelerate the localized surface plasmon resonance (LSPR)-induced hot electrons transferring and enhance the utilization of solar light. [12,13] TheC Tp rocesses at different interfaces have been considered as one of the main constraints of the photoelectric conversion efficiency.…”

mentioning

confidence: 99%

Effect of TiO₂ on Altering Direction of Interfacial Charge Transfer in a TiO₂‐Ag‐MPY‐FePc System by SERS

et al. 2019

View full text Add to dashboard Cite

Interfacial charge transfer (CT) is of interest owing to its effect on the performance of molecular photovoltaic (PV) devices.T he characteristics and structures of interfacial materials,s uch as TiO 2 nanoparticles (NPs) in some solar cells,are employed to adjust the CT process.Inthis study,three kinds of interfacial systems,i ncluding as olar cell-like TiO 2 -Ag-p-mercaptopyridine (MPY)-iron phthalocyanine (FePc) system, are compared to investigate the interfacial CT process using surface-enhanced Raman scattering (SERS) spectroscopy.The SERS results show the significance of TiO 2 NPs in the system on altering the direction and path of the interfacial CT, which is closely associated with the CT enhancement contribution to SERS in such an interfacial system. SERS spectroscopyi se xpected to be ap romising technique for the exploration and estimation of the interfacial CT behavior in PV devices,which may further extend the applications of SERS in the field of solar cells.

show abstract

“…Recently, Lee's group synthesized the currently known smallest HTS (∼100 nm) using tetrabutylamine as the SDA. 37,38 However, the obtained TiO 2 spheres were not highly uniform in size, and further adjustment of sizes to sub-100 nm was not achieved.…”

Section: ■ Introductionmentioning

confidence: 99%

Controllable Synthesis and Crystallization of Nanoporous TiO₂ Deep-Submicrospheres and Nanospheres via an Organic Acid-Mediated Sol−Gel Process

et al. 2020

Self Cite

View full text Add to dashboard Cite

Although considerable progress has been achieved in the preparation of uniform hydrous TiO 2 spheres (HTS) through the sol−gel process, there is plenty of room left in tailoring the size and morphology of HTS on the deep-submicron scale or even nanoscale since the diameters of the so far reported HTS are mostly on the (sub)micron scale (0.3−1.2 μm).Here, we develop a novel titanium tetraisopropoxide (TTIP)−organic acid (OA)−acetonitrile (ACN)−methanol (MeOH)−H 2 O system, which facilitates the control of nanoporous HTS to the range of 50−300 nm. The synthetic parameters including OA, (co-)solvent, concentration of precursor, and reaction temperature are comprehensively optimized, aiming at reproducible preparation and precise size control. Among the various OAs, n-valeric acid presents the best capability in controlling the spherical morphology and size uniformity. The synthesized amorphous HTS containing numerous micropores and mesopores show excellent hydrothermal stability and offer suitable self-template for the subsequent synthesis of mesoporous anatase TiO 2 spheres (MAT) with a large surface area of 99.1 m 2 /g. The obtained TiO 2 deepsubmicrospheres and nanospheres with tunable sizes show great potential in various research fields.

show abstract

Tailoring of nanoporous TiO2 spheres with 100–200 nm sizes for efficient dye-sensitized solar cells

Cited by 20 publications

References 54 publications

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Effect of TiO₂ on Altering Direction of Interfacial Charge Transfer in a TiO₂‐Ag‐MPY‐FePc System by SERS

Controllable Synthesis and Crystallization of Nanoporous TiO₂ Deep-Submicrospheres and Nanospheres via an Organic Acid-Mediated Sol−Gel Process

Contact Info

Product

Resources

About

Tailoring of nanoporous TiO2 spheres with 100–200 nm sizes for efficient dye-sensitized solar cells

Cited by 20 publications

References 54 publications

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Sn‐Ti Submicrospheres with Tunable Particle Size for Cyclohexanone Baeyer‐Villiger Oxidation

Effect of TiO2 on Altering Direction of Interfacial Charge Transfer in a TiO2‐Ag‐MPY‐FePc System by SERS

Controllable Synthesis and Crystallization of Nanoporous TiO2 Deep-Submicrospheres and Nanospheres via an Organic Acid-Mediated Sol−Gel Process

Contact Info

Product

Resources

About

Effect of TiO₂ on Altering Direction of Interfacial Charge Transfer in a TiO₂‐Ag‐MPY‐FePc System by SERS

Controllable Synthesis and Crystallization of Nanoporous TiO₂ Deep-Submicrospheres and Nanospheres via an Organic Acid-Mediated Sol−Gel Process