Ultrathin HNbWO<sub>6</sub> nanosheets: facile synthesis and enhanced hydrogen evolution performance from photocatalytic water splitting

Wang, Kun; Xiong, Jinhua; Luo, Shuiguang; Liang, Ruowen; Qin, Na; Liang, Shijing; Wu, Ling

doi:10.1039/c5cc05788d

Cited by 51 publications

(23 citation statements)

References 37 publications

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“…Similar to the metal oxides, the metal‐composite oxides can also show superiority toward photocatalysis, and several metal‐composite oxides have been controlled prepared with ultrathin thickness . According to the acid–base reaction and ion‐intercalation‐assisted exfoliation process, the HNbWO 6 ultrathin nanosheet can be obtained by dispersing the layered HNbWO 6 ·1.5H 2 O into triethanolamine aqueous solution . AFM result suggests that the thickness of the HNbWO 6 ultrathin nanosheet is between 1.8 and 2.0 nm, which agrees with value of monolayer.…”

Section: D Photocatalystsmentioning

confidence: 99%

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

et al. 2017

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a great deal of research interest for diverse applications such as field effect transistors, optoelectronic devices, catalysis, energy storage, and conversion. [1][2][3][4][5] Benefiting from the features of atomic thickness, large specific surface area, intrinsic quantum confined electrons, and high ratio of surface atoms to entire atoms, the ultrathin 2D materials exhibit unique physicochemical properties, such as planar conductivity, electronic anisotropy, tunable energy band structure, and high surface activity. [6,7] When the thickness of bulk materials is reduced to the atomic level, the local atomic structures will suffer from obvious distinctions including coordination number, bond angle, bond length, and disorder degree of the surface atoms and may even result in the formation of numerous surface defects. As a consequence, the ultrathin 2D materials can not only display improved inherent properties of the bulk materials but also give birth to new properties that the corresponding bulk materials do not possess. [8,9] Semiconductor photocatalysis has attracted massive research interest since it has been regarded as one of the most promising solutions to deal with the energy shortage and environmental-pollution issues. [10][11][12][13][14] With the solar light as the external driving force, the semiconductor could split water into hydrogen and oxygen, reduce the CO 2 to chemicals and valuable fuel, as well as completely eliminate pollutants. [15][16][17][18] Generally, the major critical steps in the photocatalytic process can be classified as light absorption, charge separation and migration, as well as surface redox reactions. Under the irradiation, the photocatalysts can absorb the solar light and are excited to produce electron-hole pairs when the photon energy equal to or higher the bandgap, leaving the electrons in the conduction band (CB) and holes in the valence band (VB), respectively. Subsequently, the photogenerated electrons and holes will diffuse to the materials surface and further migrate to the surface active sites before involving in the surface reactions. During this process, the recombination of charge carriers will happen and the crystal structure, crystallinity, particle size, surface atomic structure, etc., will strongly affect the separation efficiency. Finally, the target molecule will be adsorbed on the materials surface, and will undergo charge injection process and desorption to form the ultimate products. [19] Up to now, hundreds of semiconductor materials are available for different photocatalytic applications with the help As a sustainable technology, semiconductor photocatalysis has attracted considerable interest in the past several decades owing to the potential to relieve or resolve energy and environmental-pollution issues. By virtue of their unique structural and electronic properties, emerging ultrathin 2D materials with appropriate band structure show enormous potential to achieve efficient photocatalytic performance. Here, the state-of-the-art progress on ultrathin 2D...

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Section: D Photocatalystsmentioning

confidence: 99%

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

et al. 2017

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“…Among the various reported photocatalysts [3,4,5,6,7,8,9,10], metal sulfides are regarded as excellent candidates for visible light-driven photocatalysis because of their suitable band gap and high catalytic activity. In particular, CdS is the most famous photocatalyst with a band gap value of 2.4 eV, and its conduction band position is more negative than the H 2 O/H 2 reduction potential [11,12].…”

Section: Introductionmentioning

confidence: 99%

Constructing a MoS2 QDs/CdS Core/Shell Flowerlike Nanosphere Hierarchical Heterostructure for the Enhanced Stability and Photocatalytic Activity

Liang

Zhou

et al. 2016

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MoS 2 quantum dots (QDs)/CdS core/shell nanospheres with a hierarchical heterostructure have been prepared by a simple microwave hydrothermal method. The as-prepared samples are characterized by XRD, TEM, SEM, UV-VIS diffuse reflectance spectra (DRS) and N 2 -sorption in detail. The photocatalytic activities of the samples are evaluated by water splitting into hydrogen. Results show that the as-prepared MoS 2 QDs/CdS core/shell nanospheres with a diameter of about 300 nm are composed of the shell of CdS nanorods and the core of MoS 2 QDs. For the photocatalytic reaction, the samples exhibit a high stability of the photocatalytic activity and a much higher hydrogen evolution rate than the pure CdS, the composite prepared by a physical mixture, and the Pt-loaded CdS sample. In addition, the stability of CdS has also been greatly enhanced. The effect of the reaction time on the formations of nanospheres, the photoelectric properties and the photocatalytic activities of the samples has been investigated. Finally, a possible photocatalytic reaction process has also been proposed.

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“…The clear diffraction spots in selected‐area electron diffraction (SAED) pattern demonstrate the high crystallization quality of the few‐layer NbWO 6 nanosheets and the marked spots are indexed as (110) and (020) plane (Figure 1I). [ 31 ] In addition, the energy‐dispersive X‐ray spectroscopy mappings (Figure 1J–M) and corresponding atom percentage (Figure S4, Supporting Information) reveal the uniform distribution of the W, Nb, and O elements throughout the NbWO 6 nanosheets.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin 2D NbWO₆ Perovskite Semiconductor Based Gas Sensors with Ultrahigh Selectivity under Low Working Temperature

et al. 2021

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Hydrogen sulfide (H2S) detection with high selectivity and low working temperature is of great significance due to its strong toxicity both to the environment and to humans and also as an endogenous signaling molecule existing in various physiological processes. 2D perovskites with high carrier mobility are promising candidates for gas sensing; however, the development of stable and nontoxic 2D perovskites nanosheets still remains a challenge. Herein, 2D all‐inorganic NbWO6 perovskite nanosheets with thicknesses down to 1.5 nm are synthesized by liquid exfoliation, and the gas‐sensing performance based on these ultrathin nanosheets is investigated. A few‐layer NbWO6‐based sensor exhibits fast H2S sensing speed (<6 s) with high selectivity and sensitivity (S = 12.5 vs 50 ppm) at low temperature (150 °C). A small variation of H2S concentration (<0.5 ppm) can be detected with a fully reversible resistance signal. This work sheds light on the development of high‐performance gas sensors working in ambient conditions based on low‐dimensional, nontoxic, and wide‐bandgap perovskite semiconductors. The high carrier mobility, ultrathin structure, and soft nature make this type of 2D perovskite semiconductor an ideal material candidate for the fabrication of flexible, transparent, and wearable sensing devices in the future.

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Ultrathin HNbWO₆ nanosheets: facile synthesis and enhanced hydrogen evolution performance from photocatalytic water splitting

Cited by 51 publications

References 37 publications

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

Constructing a MoS2 QDs/CdS Core/Shell Flowerlike Nanosphere Hierarchical Heterostructure for the Enhanced Stability and Photocatalytic Activity

Ultrathin 2D NbWO₆ Perovskite Semiconductor Based Gas Sensors with Ultrahigh Selectivity under Low Working Temperature

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Ultrathin HNbWO6 nanosheets: facile synthesis and enhanced hydrogen evolution performance from photocatalytic water splitting

Cited by 51 publications

References 37 publications

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

Constructing a MoS2 QDs/CdS Core/Shell Flowerlike Nanosphere Hierarchical Heterostructure for the Enhanced Stability and Photocatalytic Activity

Ultrathin 2D NbWO6 Perovskite Semiconductor Based Gas Sensors with Ultrahigh Selectivity under Low Working Temperature

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Ultrathin HNbWO₆ nanosheets: facile synthesis and enhanced hydrogen evolution performance from photocatalytic water splitting

Ultrathin 2D NbWO₆ Perovskite Semiconductor Based Gas Sensors with Ultrahigh Selectivity under Low Working Temperature