2D ultra-thin WO3 nanosheets with dominant {002} crystal facets for high-performance xylene sensing and methyl orange photocatalytic degradation

Liang, Yan; Yang, Yong; Zou, Chengwu; Xu, Keng; Luo, Xingfang; Luo, Ting; Li, Jiayi; Yang, Qing; Shi, Pengyuan; Yuan, Cailei

doi:10.1016/j.jallcom.2018.12.384

Cited by 69 publications

(44 citation statements)

References 41 publications

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“…Furthermore, the surface energies of the ( 100) and (002) surfaces are 0.86 and 3.13 J•m -2 , respectively, as shown in Fig. 9, indicating that the (002) surface is more unstable [76] and likely to adsorb the H2/CO molecules [77,78] This provides favorable conditions for the formation of VZns and the adsorption of H2/CO molecules on the (002) surface.…”

Section: H2 Adsorption Model Constructed Via Dft Calculationsmentioning

confidence: 91%

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Wang

et al. 2021

Chinese Journal of Catalysis

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Photothermal catalysis is a widely researched field in which the reaction mechanism is usually investigated based on the photochemical behavior of the catalytic material. Considering that the adsorption of reactants is essential for catalytic reactions to occur, in this study, the synergistic effect of photothermal catalysis is innovatively elucidated in terms of the electron transfer behavior of reactant adsorption. For the H2 + O2 or CO + H2 reaction systems over a ZnO catalyst, UV irradiation at 25 °C or heat without UV irradiation did not cause H2 oxidation or CO reduction; only photothermal conditions (100 or 150 °C + UV light) initiated the two reactions. This result is related to the electron transfer behavior associated with the adsorption of CO or H2 on ZnO, in which H2 or CO that lost an electron could be oxidized by O2 or hydroxyls. However, the electron-accepting CO could be reduced by the electron-donating H2 into CH4 under photothermal conditions. Based on the in-situ characterization and theoretical calculation results, it was established that the synergistic effect of the photothermal conditions acted on the (002) crystal surface of ZnO to stimulate the growth of zinc vacancies, which resulted in the formation of defect energy levels, adsorption sites, and an adjusted Fermi level. As a result, the electron transfer behavior between adsorbed CO or H2 and the crystal surface varied, which further affected the photocatalytic behavior. The results show that the effect of photothermal synergy may not only produce the expected kinetic energy, but more importantly, produce energy that can change the activation mode of the reactant gas. This study provides a new understanding of the CO catalytic oxidation and reduction processes over semiconductor materials.

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Section: H2 Adsorption Model Constructed Via Dft Calculationsmentioning

confidence: 91%

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Wang

et al. 2021

Chinese Journal of Catalysis

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“…When it touches reductive gas, its conductivity will increase, while when it is exposed to oxidative gas, it decreases. By having the data of the conductivity changes, we can realize the detection of specific gases, like H 2 , H 2 S [ 198 ], CO, NH 3 [ 199 ], NO x [ 200 , 201 ], and some organic gases [ 202 , 203 ]. For instance, Liang et al [ 203 ] produced ultra-thin WO 3 nanosheets with dominant {002} crystal facets that have been proven to have improved xylene-sensing performance.…”

Section: Other Applications Of Tungsten Oxides-based Materialsmentioning

confidence: 99%

“…By having the data of the conductivity changes, we can realize the detection of specific gases, like H 2 , H 2 S [ 198 ], CO, NH 3 [ 199 ], NO x [ 200 , 201 ], and some organic gases [ 202 , 203 ]. For instance, Liang et al [ 203 ] produced ultra-thin WO 3 nanosheets with dominant {002} crystal facets that have been proven to have improved xylene-sensing performance. Ji et al [ 199 ] reported that tightly arranged nanosheet-assembled flower-like WO 3 nanostructures showed better NH 3 -sensing performances compared with tightly arranged WO 3 nanostructures.…”

Section: Other Applications Of Tungsten Oxides-based Materialsmentioning

confidence: 99%

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Han

Shi

2021

Nanomaterials

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Tungsten oxide-based materials have drawn huge attention for their versatile uses to construct various energy storage devices. Particularly, their electrochromic devices and optically-changing devices are intensively studied in terms of energy-saving. Furthermore, based on close connections in the forms of device structure and working mechanisms between these two main applications, bifunctional devices of tungsten oxide-based materials with energy storage and optical change came into our view, and when solar cells are integrated, multifunctional devices are accessible. In this article, we have reviewed the latest developments of tungsten oxide-based nanostructured materials in various kinds of applications, and our focus falls on their energy-related uses, especially supercapacitors, lithium ion batteries, electrochromic devices, and their bifunctional and multifunctional devices. Additionally, other applications such as photochromic devices, sensors, and photocatalysts of tungsten oxide-based materials have also been mentioned. We hope this article can shed light on the related applications of tungsten oxide-based materials and inspire new possibilities for further uses.

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“…Among these problems, the degradation of pollutants of aromatic and azo structures has attracted attention, and the use of photocatalytic technology to degrade dyes has emerged as a promising technology [1][2][3][4][5][6]. Photocatalysts, on the basis of semiconductor materials, such as TiO 2 [7][8][9], ZnO [10][11][12][13][14], CdS [15][16][17][18][19], and WO 3 [20][21][22][23][24], have caused a new upsurge in the degradation of methyl orange structure pollution due to their simplicity, high efficiency, low energy consumption, and mild reaction conditions [25]. Although these conventional semiconductor photocatalysts substantially affect the degradation of methyl orange, they also have limitations [17,20,26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Although CdS has a narrow band gap and a suitable band structure, the electron-hole pair recombination rate is fast, the photocatalytic activity is low, and the material is unstable, which causes photocorrosion that is harmful to the environment and human body [15,[30][31][32]. WO 3 has a small band gap and thus has a good response in the visible range, but its photocatalytic activity is low [23,24]. Given that Cu 3 N and MoS 2 have an adjustable bandgap structure, the photocatalytic performance can be improved by adjusting the size of the band gap, which is a promising photocatalytic material.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Copper Nitride/Molybdenum Disulfide Composite Films Prepared by Magnetron Sputtering

et al. 2020

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Cu3N/MoS2 composite films were prepared by magnetron sputtering under different preparation parameter, and their photocatalytic properties were investigated. Results showed that the composite films surface was uniform and had no evident cracks. When the sputtering power of MoS2 increased from 2 W to 8 W, the photocatalytic performance of the composite films showed a trend of increasing first and then decreasing. Among these films, the composite films with MoS2 sputtering power of 4 W showed the best photocatalytic degradation performance. The photocatalytic degradation rate of methyl orange at 30 min was 98.3%, because the MoS2 crystal in the films preferentially grew over the Cu3N crystal, thereby affecting the growth of the Cu3N crystal. The crystallinity of the copper nitride also increased. During photocatalytic degradation, the proper amount of MoS2 reduced the band gap of Cu3N, and the photogenerated electron hole pairs were easily separated. Thus, the films produces additional photogenerated electrons and promotes the degradation reaction of the composite films on methyl orange solution.

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2D ultra-thin WO3 nanosheets with dominant {002} crystal facets for high-performance xylene sensing and methyl orange photocatalytic degradation

Cited by 69 publications

References 41 publications

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Photocatalytic Properties of Copper Nitride/Molybdenum Disulfide Composite Films Prepared by Magnetron Sputtering

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