Construction of g-C3N4-mNb2O5 Composites with Enhanced Visible Light Photocatalytic Activity

Wang, Meiyin; Wang, Hui; Ren, Yuanhang; Wang, Cheng; Weng, Zhewei; Yue, Bin

doi:10.3390/nano8060427

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…The second emission band in TiO 2 , ZnO, and Nb 2 O 5 PL emission spectra represents green emission caused by oxygen vacancies and surface defects. The green emission is quite strong because of radial recombination between photogenerated holes with trap electrons at the oxygen vacancies. − …”

Section: Resultsmentioning

confidence: 99%

Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Beedri,

Dani,

Gaikwad

et al. 2023

ACS Omega

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This research focuses on the first demonstration of NO2Lw (2-hydroxy-3-nitronaphthalene-1,4-dione) as a photosensitizer and TiO2, ZnO, and Nb2O5 as photoanode materials for dye-sensitized solar cells (DSSCs). The metal-free organic photosensitizer (i.e., nitro-group-substituted naphthoquinone, NO2Lw) was synthesized for this purpose. As a photoanode material, metal oxides, such as TiO2, ZnO, and Nb2O5, were selected. The synthesized NO2Lw contains an electron-withdrawing group (−NO2) and anchoring groups (−OH) that exhibit absorption in the visible range. The UV–visible absorbance spectrum of NO2Lw demonstrates the absorption ascribed to ultraviolet and visible region charge transfer. The NO2Lw interacts with the TiO2, ZnO, and Nb2O5 photoanode, as shown by bathochromic shifts in wavelengths in the photosensitizer-loaded TiO2, ZnO, and Nb2O5 photoanodes. FT-IR analysis also studied the bonding interaction between NO2Lw and TiO2, ZnO, and Nb2O5 photoanode material. The TiO2, ZnO, and Nb2O5 photoanodes loaded with NO2Lw exhibit a shift in the wavenumber of the functional groups, indicating that these groups were involved in loading the NO2Lw photosensitizer. The amount of photosensitizer loading was calculated, showing that TiO2 has higher loading than ZnO and Nb2O5 photoanodes; this factor may constitute an increased J SC value of the TiO2 photoanode. The device performance is compared using photocurrent–voltage (J–V) curves; electrochemical impedance spectroscopy (EIS) measurement examines the device’s charge transport. The TiO2 photoanode showed higher performance than the ZnO and Nb2O5 photoanodes in terms of photoelectrochemical properties. When compared to ZnO and Nb2O5 photoanodes-based DSSCs, the TiO2 photoanode Bode plot shows a signature frequency peak corresponding to electron recombination rate toward the low-frequency region, showing that TiO2 has a greater electron lifetime than ZnO and Nb2O5 photoanodes based DSSCs.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Beedri,

Dani,

Gaikwad

et al. 2023

ACS Omega

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“…UV‐vis diffuse reflectance spectroscopy measurements estimate the bandgap of the catalysts, which is essential to determine if the catalysts can be exited in the visible‐region . The direct optical band position of the g‐C 3 N 4 and Nb 2 O 5 was estimated from the αhν =B (hν−E g ) 1/2 using the Tauc and grigovici formula .…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

et al. 2019

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The design and fabrication of highly active visible‐light‐driven photocatalysts have been received considerable attention in recent years. However, individual component‐based photocatalysts are limited in their use because of the high recombination of photoinduced carriers and poor chemical stability. Herein, the Z‐scheme‐originated photocatalytic activity of in‐situ deposited Nb2O5 NPs on the plane surface of carbon nitride (g‐C3N4) nanosheets (i. e. CN‐NbO) heterostructures was studied using a simple thermal pyrolysis method. The as‐synthesized photocatalysts distinctly manifested efficient white light‐emitting diode (LED) light irradiation toward organic malachite green (MG) dye degradation and photocatalytic hydrogen generation. The CN‐NbO heterostructure showed a faster degradation rate of the MG dye and a higher photocatalytic hydrogen evolution rate. In addition, the plausible Z‐scheme photocatalytic mechanism for photocatalytic hydrogen production under LED light irradiation was discussed. Photoelectrochemcial studies showed that the superior photoactivity of CN‐NbO heterostructure is mainly a result of the suitable alignment of the band edge positions, which diminish carrier recombination and facilitate efficient interfacial charge transport at their interface. This study provides an ideal method for in‐situ fabrication of novel two dimensional/one dimension‐based photocatalysts with high activity and stable performance for photocatalytic hydrogen generation.

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“…A Biorad©Aminex HPX-87 sugar column was employed at 35 Figure 1 shows the FT-IR spectra of SBA-15, NH 2 -SBA-15 and xPMo/NH 2 -SBA-15 catalysts. A broad band ranging from 3000 to 3600 cm −1 and a band around 1620 cm −1 observed for all samples is attributed to the vibration of O-H of physisorbed water [34,35]. Compared with SBA-15, NH 2 -SBA-15 had two new peaks at 2950 and 1520 cm −1 , which were assigned to the stretching mode of C-H and bending mode of N-H, respectively, indicating that the aminopropyl groups were successfully grafted on the surface of SBA-15 [34,36].…”

Section: Catalytic Testsmentioning

confidence: 87%

H3PMo12O40 Immobilized on Amine Functionalized SBA-15 as a Catalyst for Aldose Epimerization

Wang

Shang

et al. 2020

Materials

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In this work various amount of phosphomolybdic acid (PMo) were immobilized on amine functionalized SBA-15 and used as heterogeneous catalysts in the epimerization of glucose in aqueous solution. 13.3PMo/NH2-SBA-15 exhibited the best catalytic performance with a glucose conversion of 34.8% and mannose selectivity of 85.6% within two hours at 120 °C. The activation energy of 80.1 ± 0.1 kJ·mol−1 was lower than that of 96 kJ·mol−1 over the homogeneous H3PMo12O40 catalyst. The catalytic activities of 13.3PMo/NH2-SBA-15 for the transformation of some other aldoses including mannose, arabinose and xylose were also investigated.

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Construction of g-C3N4-mNb2O5 Composites with Enhanced Visible Light Photocatalytic Activity

Cited by 13 publications

References 48 publications

Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

H3PMo12O40 Immobilized on Amine Functionalized SBA-15 as a Catalyst for Aldose Epimerization

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Construction of g-C3N4-mNb2O5 Composites with Enhanced Visible Light Photocatalytic Activity

Cited by 13 publications

References 48 publications

Comparative Study of TiO2, ZnO, and Nb2O5 Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Comparative Study of TiO2, ZnO, and Nb2O5 Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Pyrolysis‐Synthesized g‐C3N4/Nb2O5 Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

H3PMo12O40 Immobilized on Amine Functionalized SBA-15 as a Catalyst for Aldose Epimerization

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Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Comparative Study of TiO₂, ZnO, and Nb₂O₅ Photoanodes for Nitro-Substituted Naphthoquinone Photosensitizer-Based Solar Cells

Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation