Hydrothermal preparation of carbon modified KNb3O8 nanosheets for efficient photocatalytic H2 evolution

He, Yiming; Dai, Xiaoquan; Ma, Sainan; Chen, Lu; Feng, Zhe Chuan; Xing, Pingxing; Yu, Jinxiong; Wu, Ying

doi:10.1016/j.ceramint.2020.01.070

Cited by 46 publications

(7 citation statements)

References 30 publications

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“…The electrons in the lower energy level, valence band (VB), absorb the photons and jump up to the higher energy level, conduction band (CB), and leave holes behind them. [44] Then, the free electrons and holes create a negative mass on CB and a positive mass on VB, respectively, and take part in the chemical redox reactions with the adsorbed oxygen and water molecules. [45] Concerning the Butler and Ginley model, electron transfer mode depends on CB and VB energies of the semiconductors at the point of zero charges, calculated by the following equations:…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Karimi

Iliyat

Atashkadi

et al. 2020

J Chinese Chemical Soc

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The preparation and photocatalytic performance of the Fe 2 O 3 /g-C 3 N 4 nanocomposites with different weight percentage of iron was investigated in this study. Samples were successfully synthesized using melamine and ferric nitrate as the precursors via the green and facile microwave-assisted method. The physicochemical and structural properties of the Fe 2 O 3-doped g-C 3 N 4 were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), the Brunauer-Emmett-Teller (BET) method, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and ultraviolet-visible spectroscopy (UV-Vis). The photocatalytic activity of the Fe 2 O 3 /g-C 3 N 4 catalysts was evaluated by the degradation of methylene blue (MB) at room temperature under visible light irradiation. As expected, the assynthesized samples exhibited considerable improvement in the photodegradation of MB. The Fe 2 O 3 /g-C 3 N 4 (1.0 wt%) nanocomposite had superior photocatalytic activity, with almost 70% degradation efficiency within 90 min of irradiation. The enhanced performance was ascribed to the separation and migration of the photoinduced electron-hole pairs and taking part of the charge carriers in the chemical redox reactions at the surface of the photocatalyst. In this work, the effect of Fe weight percentage on the degradation potential was also studied, and the photocatalytic mechanism was proposed with the main reactive species •OH.

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Section: Photocatalytic Mechanismmentioning

confidence: 99%

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Karimi

Iliyat

Atashkadi

et al. 2020

J Chinese Chemical Soc

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“…In the past reports, low-dimensional KNb 3 O 8 materials synthesized via sol-gel or hydrothermal methods were widely applied in photocatalysis and lithium ion battery. [39][40][41][42][43] However, the disordered morphology of thick KNb 3 O 8 nanoflakes synthesized by the above methods cannot be used in micro-nano devices due to incompatibility with semiconductor processing technology. The low crystallinity, numerous oxygen defects, and unavoidable surface contamination of the liquidphase synthesized KNb 3 O 8 nanoflakes also hinder its development in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Polarization Sensitive Solar‐Blind Ultraviolet Photodetectors Based on Ultrawide Bandgap KNb₃O₈ Nanobelt with Fringe‐Like Atomic Lattice

Yue

Long

Liu

et al. 2022

Adv Funct Materials

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Low-dimensional ultrawide bandgap semiconductors demonstrate great potential in fabricating solar-blind ultraviolet photodetectors. However, the widespread use of detectors is still limited by the low responsivity, large noise, and dark current, and especially few detectors can fulfill the solarblind ultraviolet detection and the polarization dependence simultaneously. Herein, a polarization sensitive solar-blind ultraviolet photodetector based on ultrathin KNb 3 O 8 nanobelts synthesized via chemical vapor deposition growth, is reported. By selecting suitable substrate and tuning the growth temperature, the nonlayered KNb 3 O 8 crystal is grown into the quasi-1D ultrathin nanobelt with thickness in the range of 4.8-120 nm. Density functional theory calculations and experimental results indicate that the ultrathin KNb 3 O 8 nanobelt possesses an ultrawide bandgap (4.15 eV) as well as unusual in-plane structural anisotropy. Benefiting from the above features, the ultrathin KNb 3 O 8 nanobelt-based device exhibits superior photodetection performances with high responsivity (30 A W −1 ), high detectivity (5.95 × 10 11 Jones), and ultralow dark current (7.1 × 10 −15 A) in the solar-blind ultraviolet region (230-280 nm). In addition, the KNb 3 O 8 photodetector displays strong polarization sensitive photoresponse with a linear dichroic ratio of 1.62 at 254 nm. With these remarkable features, the ultrathin KNb 3 O 8 nanobelt provides great opportunities for designing the next-generation multifunctional solar-blind ultraviolet optoelectronic devices.

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“…It suggests that the introduction of Ag species can reduce the reduction overpotential of H + /H 2 and gives rise to the high photocatalytic activity. [ 45–48 ]…”

Section: Resultsmentioning

confidence: 99%

Ultrasmall Ag species decorated on α‐Fe₂O₃ nanorods toward high‐efficient photocatalytic degrading tetracycline hydrochloride in water

Zhou

et al. 2021

J Chinese Chemical Soc

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The ultrasmall Ag species decorated on α‐Fe2O3 nanorods photocatalysts are prepared through a facile in situ photodeposition process. The obtained Ag/α‐Fe2O3 composite samples display more outstanding photocatalytic activity than original α‐Fe2O3 in the degradation of tetracycline hydrochloride (TC‐HCl) in water. The degradation rate constant of TC‐HCl over the Ag/α‐Fe2O3‐5 sample reaches up to 0.0118 min−1, which is about 6.21 times than that over original α‐Fe2O3 sample (0.0019 min−1). The structure characterizations, physicochemical properties, and photoelectrochemical measurements reveal that the visible light absorption ability and charge separation efficiency are improved dramatically owing to the decoration effect of ultrasmall Ag species on the surface of α‐Fe2O3 nanorods. The photocatalytic reaction mechanism investigations demonstrate that holes, ˙O2−, and ˙OH all are main active species and play important roles in the degradation process of TC‐HCl.

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Hydrothermal preparation of carbon modified KNb3O8 nanosheets for efficient photocatalytic H2 evolution

Cited by 46 publications

References 30 publications

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Polarization Sensitive Solar‐Blind Ultraviolet Photodetectors Based on Ultrawide Bandgap KNb₃O₈ Nanobelt with Fringe‐Like Atomic Lattice

Ultrasmall Ag species decorated on α‐Fe₂O₃ nanorods toward high‐efficient photocatalytic degrading tetracycline hydrochloride in water

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Hydrothermal preparation of carbon modified KNb3O8 nanosheets for efficient photocatalytic H2 evolution

Cited by 46 publications

References 30 publications

Microwave‐assisted synthesis of the Fe2O3/g‐C3N4 nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Microwave‐assisted synthesis of the Fe2O3/g‐C3N4 nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Polarization Sensitive Solar‐Blind Ultraviolet Photodetectors Based on Ultrawide Bandgap KNb3O8 Nanobelt with Fringe‐Like Atomic Lattice

Ultrasmall Ag species decorated on α‐Fe2O3 nanorods toward high‐efficient photocatalytic degrading tetracycline hydrochloride in water

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Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Polarization Sensitive Solar‐Blind Ultraviolet Photodetectors Based on Ultrawide Bandgap KNb₃O₈ Nanobelt with Fringe‐Like Atomic Lattice

Ultrasmall Ag species decorated on α‐Fe₂O₃ nanorods toward high‐efficient photocatalytic degrading tetracycline hydrochloride in water