PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 7
·3953-3958
·
IF 3.43
Jingbo Qi,Xun Hu
The reduction of ZnO in a ZnO-supported catalyst to metallic zinc, the alloying of metallic zinc with a second metal and the evaporation of zinc species in a reductive atmosphere of hydrogen was investigated in this study. The results show that the reduction temperature was the determining factor for the transformation of zinc species. The complete removal of ZnO in a ZnO-supported catalyst can be achieved at 700 °C. The effects of different metals supported on ZnO on the transformation of ZnO were also investigated. Cu, Co and Ni species can slow the ZnO loss due to the priority for the reduction of these metal oxides and the formation of metal–Zn intermetallics. Fe based catalysts noticeably accelerated the loss of ZnO, which can be ascribed to the high oxophilicity of Fe and the strong interactions between the metal and support.
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OPTICS EXPRESS
·
2022
·Vol. 30
·期 18
·32509-32527
·
IF 3.833
Fengrui Li,Baojie Shan,Xiaofei Zhao,Chang Ji,Zhen Li,Jing Yu,Shicai Xu,Yang Jiao,Yang Jiao,Chao Zhang,Baoyuan Man,Baoyuan Man
The coordination of piezoelectric and plasmonic effects to regulate the separation and migration of photo-generated carriers is still a significant method to improve the performance of visible-light photoresponse. Herein, we propose the PVDF@Ag-ZnO/Au composite nanofiber membranes utilizing the piezoelectric and plasmonic effects to promote the photocatalytic degradation of organic dyes. Here, ZnO nanorods can generate a built-in electric field under vibration to separate electron-hole pairs. The Schottky junction formed by noble metal/semiconductor can not only inhibit the recombination of photo-generated carriers and accelerate the migration of carriers, but also enhance the utilization of visible light. In addition, the structure has excellent flexibility and easy recycling characteristics. We demonstrate that the plasmonic effect of noble metal can enhance the light response of membranes and broaden light absorption from ultraviolet to visible light region. With the help of the surface-enhanced Raman scattering (SERS), modulation effects of the piezoelectric effect on light response is proved. For catalytic processes, rhodamine B (98.8%) can be almost completely degraded using PVDF@Ag-ZnO/Au within 120 minutes in the piezoelectric photocatalysis process, which is 2.2 and 2.8 times higher than photocatalysis and piezoelectric catalysis, respectively. This work provides a promising strategy for harnessing solar and mechanical energy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Longkai Pan,Li Yao,Hui Mei,Hongxia Liu,Zhipeng Jin,Shixiang Zhou,Minggang Zhang,Gangqiang Zhu,Laifei Cheng,Litong Zhang
In this study, a novel 3D Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterial was prepared by 3D printing and the hydrothermal method. The unique gyroid macrostructure and nanoarray microstructure offer a large volume of active sites for the photothermal catalytic reaction, thus improving the overall utilization rate of light. ZnO obtained by sintering the precursor produces oxygen vacancies, primarily due to P doping. This enables it to have a photothermal effect. After loading Bi 2 S 3 , the photothermal effect of P-ZnO and Bi 2 S 3 is coupled, further increasing the surface temperature of composite structure and speeding up the reaction rate. P-ZnO and Bi 2 S 3 formed a S-scheme heterojunction, promoting the separation and transfer of photogenerated carriers. Under simulated sunlight, the CO and CH 4 yield of Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterials are 8.87 and 1.49 μmol h −1 . These are 3.45 times and 4.65 times of P-ZnO gyroid structure, respectively. Through SEM, TEM, XPS, ESR and in-situ FTIR characterizations, the transfer paths of photogenerated carriers between heterojunctions were revealed, and the reaction paths of photothermal catalytic CO 2 reduction were explored. The co-design of 3D structure and material allows for a novel concept for further improving photothermal catalytic performance.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Arsalan Muhammad,Saddique Imram,Baoji Miao,Awais Azka,Khan Ilyas,Shamseldin Mohamed A.,Mehrez Sadok
We aimed to synthesize sensitive electrochemical sensors for hydrogen peroxide sensing by using zinc oxide nanorods grown on a fluorine-doped tin oxide electrode by using the facial hydrothermal method. It was essential to keep the surface morphology of the material (nanorods structure); due to its large surface area, the concerned material has enhanced detection ability toward the analyte. The work presents a non-enzymatic H2O2 sensor using vertically grown zinc oxide nanorods on the electrode (FTO) surfaces with Cu nanoparticles deposited on zinc oxide nanorods to enhance the activity. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-Ray (EDX), X-ray diffraction (XRD), and electrochemical methods were used to characterize copper–zinc oxide nanorods. In addition to the high surface area, the hexagonal Cu-ZnO nanorods exhibited enhanced electrochemical features of H2O2 oxidation. Nanorods made from Cu-ZnO exhibit highly efficient sensitivity of 3415 μAmM−1cm−2 low detection limits (LODs) of 0.16 μM and extremely wide linear ranges (0.001–11 mM). In addition, copper-zinc oxide nanorods demonstrated decent reproducibility, repeatability, stability, and selectivity after being used for H2O2 sensing in water samples with an RSD value of 3.83%. Cu nanoparticles decorated on ZnO nanorods demonstrate excellent potential for the detection of hydrogen peroxide, providing a new way to prepare hydrogen peroxide detecting devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lu Liu,Shuzhong Wang,Wei Liu,Jinlong Wang,Baoquan Zhang,Jianqiao Yang,Hui Liu,Yanhui Li
In this paper, ZnO particles with the particle size as low as 23 nm were successfully prepared by supercritical hydrothermal synthesis technique. The particle size of nano-ZnO decreased with the increase of temperature and pressure. Nano-ZnO particles in ZnSO 4 system were spherical with smaller particle size. The discrepancy in nano-ZnO produced by different precursor of Zn(NO 3 ) 2 , Zn(CH 3 COO) 2 or ZnSO 4 is attributed to the anion effects and supersaturation . The particles in the KOH system (29 nm) were smaller than those in the NaOH system (44 nm). For precursor concentration, intermediate Zn(OH) 2 was generated at lower concentration, while Zn 4 SO 4 (OH) 6 ·4H 2 O was produced at higher concentration. For alkali concentration, as the gradual increase of KOH concentration, Zn(OH) 2 began to decrease and gradually transformed into Zn(OH) 3 – and [Zn(OH) 4 ] 2− . When the KOH concentration reached a certain value, [Zn(OH) 4 ] 2− occupied the dominance in the mixed solution.
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高影响因子
NANO
·
2023
·
IF 1.2
Xueqi Wang,Jinkun Cheng,Xudong Xiong,Chao Xu,Zhao Fan,Yongqian Wang
Photothermal-assisted photocatalysis is a novel catalytic technology that can not only utilize both light energy and light heat, but also simultaneously incorporate superhydrophobicity and self-healing ability into photocatalysts. It represents a significant advancement in efficient photocatalytic degradation of water pollution. Here, by incorporating the semiconductor photothermal agent CuS on the outer layer of ZnO nanoflowers, the deposited CuS layer exhibits an outstanding photothermal effect under near-infrared light irradiation, which can absorb infrared light and convert it into heat energy, enhancing the performance of the ZnO nanoflowers in situ . Meanwhile, a photothermal conversion surface material with self-healing superhydrophobicity is prepared by using a mixture of beeswax and polydimethylsiloxane. The broad light absorption ability and enhanced charge transfer accelerate the photocatalytic efficiency, in addition, the incorporation of superhydrophobicity enables resistance to corrosive liquid pollution and repairs its superhydrophobicity damage by beeswax migration to provide lasting protection. The degradation rate of MB is as high as 98% within 80 min. Finally, the mechanism of photothermal effect in photocatalysis and the mechanism of self-healing superhydrophobicity are proposed. This work innovatively integrates photothermal effect and self-healing superhydrophobic function into photocatalytic degradation of water pollution technology, which broadens the scope of improving photocatalytic performance and extends the photocatalyst operation life to a certain extent.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 5
·2911-2917
·
IF 4.186
Zhifang Zhou,Yunpeng Zheng,Yueyang Yang,Wenyu Zhang,Bin Wei,Mingchu Zou,Jinle Lan,Ce-Wen Nan,Yuan-Hua Lin
As a transparent thermoelectric oxide, gallium-doped zinc oxide (GZO) has the potential to power wearable or portable electronics and may be used in the integrated circuits industry for chip cooling. Constructing ZnO–GZO interfaces has been proposed as an effective strategy for improving thermoelectric performance of GZO thin films. However, without the aid of band structure calculation for multilayered films, it is hard to directly elucidate the underlying mechanisms of carrier transport. Weighted mobility is an indicator that reveals the inherent electronic transport properties like carrier scattering, electronic band structure, and so on. Thus, to further investigate the effects of ZnO–GZO interfaces on electrical properties of GZO thin films, the structures containing different numbers of ZnO–GZO interfaces were designed and the correlations among numbers of ZnO–GZO interfaces, weighted mobility, and electrical properties were explored. It was found that with more ZnO–GZO interfaces, the weighted mobility increased, and the power factor values also improved as well. Consequently, an enhanced power factor value reached 439 μW m −1 K −2 at 623 K. This work demonstrated the beneficial effects of multiple interfaces on the improvements of electrical transport performance through analyzing weighted mobility, which laid a foundation for further optimization of thermoelectric performance.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Bi Leyao,Fu Boyan,Lin Jiahui,Wen Junsheng,Fu Jiaxing,Zou Binglin,Su Ningning,Wang Chunjie,Wang Yue
Ag-modified ZnO coral-like nanosheets were synthesized for the first time using a simple hydrothermal method. Compared to other Ag-modified ZnO sensors, the sensor with 2 wt% Ag content demonstrates excellent ethanol-sensing performance. The maximum response value of 67.42 can be achieved at the optimal operating temperature of 260 °C for 100 ppm ethanol gas, with corresponding response/recovery time of 6/75 s, respectively. This sensor also exhibits superior selectivity, reproducibility, and long-term stability. Techniques such as XRD, XPS, SEM, and TEM were employed to characterize the physicochemical properties of the gas-sensitive materials. Further research indicates that the enhanced gas-sensing properties of the composite materials can be mainly attributed to the unique coral-like nanosheet structure, the relatively high-specific surface area (9.8706 m 2 /g), and the combined effects of the Ag-ZnO heterostructure, as well as the synergistic interplay of electronic sensitization and spillover effects. This research offers valuable insights into the modification of ZnO-based gas-sensing materials with noble metals. Graphical
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PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Zongqi Zhang,Xiaxi Yao,Xiang Liu
Solar-driven water splitting devoid of noble-metal co-catalysts is a promising and cost-efficient strategy for the production of clean and sustainable energy, namely hydrogen. The primary impediment to the practical application of photocatalysts lies in the efficiency of separation of photo-induced charge carriers. Herein, two core–shell ternary nanorod photocatalysts based on ZnO, ZnO@CuS@ZnS and ZnO@ZnS@CuS, were obtained via a facile surface sulfidation strategy. Intriguingly, it was discovered that the performance of hydrogen evolution of these photocatalysts was contingent upon the sequence of sulfidation. Meanwhile, the as-prepared photocatalysts displayed distinct advantages in different aspects. ZnO@CuS@ZnS exhibited a lower activation energy barrier, while ZnO@ZnS@CuS presented a more suppressed electron-hole pairs recombination. The composites exhibited high-efficiency of hydrogen evolution rates, 2.79 µmol·mg −1 ·h −1 (ZnO@CuS@ZnS) and 9.48 µmol·mg −1 ·h −1 (ZnO@ZnS@CuS), along with stable (20 h) performance. This phenomenon has been ascribed to the development of an n-p heterojunction structure, Z-scheme charge transfer mechanism, and the high-performing light-triggered charge separation to relatively extended lifetimes of 5.06 µs and 6.06 µs, respectively. This research may deliver significant understanding of the designation of economical and scalable ZnO-based heterojunction photocatalysts for hydrogen evolution reactions in photocatalysis.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 8
·1817
·
IF 4.2
Zhihao Tang,Yonggang Yang,Weiqi Wei
Herein, a series of ZnO-doped lignin-based carbons (LC/ZnO) were successfully prepared from different types of lignin and used for methyl orange (MO) photocatalytic degradation. The apparent morphology, internal structure, and photoelectric properties of prepared LC/ZnO composites and their effects on subsequent MO photocatalytic degradation were investigated by various characterization techniques. The results showed that the LC/ZnO composites that were prepared in this work mainly consisted of highly dispersed ZnO nanoparticles and lignin-based carbon nano-sheets, which were beneficial for subsequent photogenerated electrons and holes formation, dispersion, and migration. The MO could be significantly degraded with various ZnO-doped lignin-based carbons, especially over the LCSL/ZnO, and the maximum degradation rate was 96.9% within 30 min under the simulated 300w sunlight exposure. The experiments of free radical elimination showed that the photocatalytic degradation of MO over LC/ZnO were a result of the co-action of multiple free radicals, and h+might play the predominant roles in MO degradation. In addition, the pH of the solution had little effect on MO degradation, and the MO could be effectively degraded even in an alkaline solution of pH = 12.0. The cycling experiments showed that the prepared LC/ZnO had a good stability for MO photodegradation, especially for LCSL/ZnO, even after 5 times recycling, and the degradation rate of MO only dropped from 97.0% to 93.0%. The research not only provided a fundamental theory for the efficient photocatalytic degradation of MO by LC/ZnO composites, but also offered a new insight into lignin valorization.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Hao Zhang,Wenwen Zhou,Xiang Yi,Keyu Chen,Zhifeng Ao,Yuan Gao,Peiqin Wang,Zhongting Hu,Wenhong Xu,Zhigang Shen
Inorganic antibacterial materials, particularly ZnO nanoparticles, exhibit significant potential in combating bacterial infections due to their good biocompatibility, chemical stability and low toxicity. However, the tedious synthesis process and low separation efficiency of photogenerated carriers are two major challenges for ZnO nanoparticles to be widely deployed. In this study, a microchannel reactor was employed for the one-step synthesis of ZnO based nanoparticles in low-temperature (below 85 °C) aqueous-phase. Moreover, by in-situ doping the ZnO structure with 10 mol% cerium (10Ce-ZnO), the higher charge separation efficiency and better broad-spectrum antibacterial properties were observed compared to pure ZnO nanoparticles. Thanks to the scale-up production, 10Ce-ZnO nanoparticles can be put into real life application as ceramic glaze additives (1 wt%) and achieve 99.99 % bactericidal properties against Gram-negative and Gram-positive bacteria. Last but not least, an in-depth analysis of the interaction mechanisms between the material and bacteria was conducted.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Aerzigu Xukeer,Jin Li
ZnO/MnO 2 nanostructures, including nanosheets and nanotubes, were synthesized by hydrothermal and annealing method. The carefully designed ZnO/MnO 2 heterostructure significantly enhances ammonia gas sensing performance at room temperature (RT). By integrating heterojunction formation with structural optimization, this approach facilitates faster charge carrier transport and increases the surface area compared to pure ZnO. The incorporation of nanosheet- and nanotube-structured ZnO/MnO 2 heterojunctions leads to a substantial reduction in response/recovery time, which decrease to 6 s and 3 s, accordingly. Furthermore, first-principles calculations are employed to elucidate the potential sensing mechanism by analyzing the electronic density of states, electrostatic potential, charge transfer, population analysis, and adsorption energy between the sensing materials and ammonia molecules.
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高影响因子
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