A room-temperature aniline sensor based on Ce doped ZnO porous nanosheets with abundant oxygen vacancies

Zhang, Yonghui; Peng, Ming-Xing; Yue, Lijuan; Chen, Junli; Gong, Feilong; Xie, Kefeng; Fang, Shaoming

doi:10.1016/j.jallcom.2021.160988

Cited by 57 publications

(12 citation statements)

References 51 publications

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“…Zhang et al found that the abundant oxygen vacancy, high specific surface area, and interfacial interaction between CeO 2 and ZnO effectively amplified the resistance changes caused by oxygen adsorption changes. Two-dimensional (2D) porous structures also play an important role in excellent sensing performance due to excellent electron transport capacity and abundant gas diffusion channels [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zhang

2022

Nanomaterials

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In this paper, ZnO/NiO composites rich in oxygen vacancies are prepared by the solvothermal method and reduction method. In the test, through the use of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and electron paramagnetic resonance (EPR), we effectively prove the existence of phase, morphology and oxygen vacancies in the material. Through the photocatalysis test and gas sensitivity test, it is found that 10% Ni doped OZN-10 has the best photocatalytic activity and gas sensitivity characteristics. The degradation rate of methylene blue (MB) was 98%. The gas sensitivity test shows that OZN-10 has good selectivity, good response performance (3000 ppm, 27,887%) and excellent response recovery time (response time: 50 s, recovery time: 5–7 s) for saturated NH3 gas at standard atmospheric pressure (101.325 KPa) and room temperature (25 °C). The synergistic effect of oxygen vacancy as the center of a trap and p–n heterojunction forming an electric potential field at the interface is explained, and the mechanism of improving photocatalysis and gas sensitivity is analyzed. This work will provide an innovative vision for dual-performance oxygen vacancy modification of heterojunctions through photocatalysis.

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Section: Introductionmentioning

confidence: 99%

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zhang

2022

Nanomaterials

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“…In the high-resolution TEM (HRTEM) image of Figure 1g, ZnO 1−x shows clear lattice stripes with a plane spacing of 0.26 nm, which is in good accordance with the (002) crystal plane. 30 The selected-area electron diffraction patterns of ZnO and ZnO 1−x show a series of diffraction rings belonging to ZnO, and both show good polycrystalline nature (Figure S2). 31 The X-ray diffraction (XRD) patterns of ZnO and ZnO 1−x are depicted in Figure 2a.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Oxygen Vacancies ZnO_1–x as Anode Materials for Superior-Performance Zinc-Nickel Alkaline Batteries

Cai

Yuan

Liang

et al. 2023

Ind. Eng. Chem. Res.

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Zinc-nickel (Zn-Ni) alkaline batteries have appealed extensive research interest due to their low cost, high safety, and high energy density, which are favorable competitors in zinc-based batteries. Herein, we prepared ZnO with oxygen vacancies by simple hydrothermal and high temperature reduction annealing as anode materials for Zn-Ni alkaline batteries. In comparison with pristine ZnO, the introduction of oxygen vacancies not only improves the electronic conductivity of the material but also effectively provides more active sites for the reaction and lowers the ion transport energy barrier, thus improving the electrochemical reaction kinetics of ZnO 1−x . A variety of experimental results and density functional theory calculations show that ZnO 1−x has good electrochemical properties. Consequently, the synthesized ZnO 1−x anode material exhibits a specific capacity of 590 mA h g −1 at 5 C (90% retention over 800 cycles) and excellent rate performance (612 mA h g −1 at 10 C). Significantly, this work provides new insights into the development of anode materials for long cycle life and high rate performance.

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“…Compared with ZnO, the absorption edge of PZO showed obvious red shift. This is because the loading of Pd nanoparticles on the surface of ZnO generates defect levels, which is bene cial to reduce the energy required by electrons during the transition [40]. The band gap of the sensitive material was calculated by Tauc equation: αhν = C(hν -Eg) 1/2 [41].…”

Section: Structure Characterizationsmentioning

confidence: 99%

Pd decorated ZnO nanosheets for enhanced hydrogen sensing performance

Dong

Zhao

Peng

et al. 2023

Preprint

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With the exhaustion of fossil energy, hydrogen (H2), as a kind of clean energy with extensive source and high calorific value, has attracted great attention. However, in the process of H2 preparation, transportation and storage, safety accidents such as leakage and explosion often occur, which greatly hinders the development and utilization of H2. Therefore, fast and accurate detection of H2 plays an important role in H2 industry. Based on this, we have synthesized two-dimensional (2D) zinc oxide (ZnO) nanosheets by hydrothermal method, and further optimized its sensing performance through Pd modification. H2 sensitivity test results show that Pd load can greatly enhance the sensing performance of 2D ZnO materials. At 160°C, the sensing response of Pd load ZnO sensitive materials (PZO) towards H2 (100 ppm) is 17.6, which is much higher than the pure ZnO nanosheets (3.2). Additionly, the H2 sensing performance of the prepared gas sensor did not change significantly during the 30-days test, showing excellent stability. The H2 sensing mechanism of PZO sensitive materials is mainly attributed to the synergistic mechanism of Pd catalytic site and oxygen vacancy (OV). Therefore, the synthesized PZO sensitive material provides an effective strategy for the preparation of high-performance H2 sensors.

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A room-temperature aniline sensor based on Ce doped ZnO porous nanosheets with abundant oxygen vacancies

Cited by 57 publications

References 51 publications

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Oxygen Vacancies ZnO_1–x as Anode Materials for Superior-Performance Zinc-Nickel Alkaline Batteries

Pd decorated ZnO nanosheets for enhanced hydrogen sensing performance

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A room-temperature aniline sensor based on Ce doped ZnO porous nanosheets with abundant oxygen vacancies

Cited by 57 publications

References 51 publications

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Oxygen Vacancies ZnO1–x as Anode Materials for Superior-Performance Zinc-Nickel Alkaline Batteries

Pd decorated ZnO nanosheets for enhanced hydrogen sensing performance

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Oxygen Vacancies ZnO_1–x as Anode Materials for Superior-Performance Zinc-Nickel Alkaline Batteries