CERAMICS INTERNATIONAL
·
2017
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IF 2.986
Xiang Lv,Tianhe Wang,Wei Jiang
We report a facile method to prepare porous TiO 2 and ZnO photo-catalytic ceramics in which colloidal silica was added to yield nano fused silica (FS). The colloidal silica forms continuous media within the porous ceramic structure, and when calcined at 550 °C, it converted to fused silica phase which is an excellent UV wave-guiding material. With light wave guiding effect of FS and capillary effect of reaction solution in the porous channels, the photo-catalytic reactions could occur at the vast active sites at interface inside the porous bulks, as well as at the external surfaces. Photo-catalysis experiments and kinetics were investigated and analyzed. The photo-catalytic efficiencies tested for methylene blue were enhanced by a factor of 4.1 for TiO 2 /FS system and, astonishingly, by a factor of 34.6 for ZnO/FS system, when compared with pure TiO 2 and ZnO under identical testing conditions. A model of UV-waveguide ceramic systems was proposed and discussed. This study proposes a practical approach to construct UV-waveguide porous structures, of which the principle is also potentially applicable to other types of photo-catalytic materials, including visible light active photo-catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Rong Yang,Jianan Liu,Xuemeng Sun,Cheng Wang,Baojiang Jiang
The application of photocatalysis for the production of high-purity and high-energy-density green ammonia holds substantial promise. However, the restricted light absorption efficiency and high recombination rate of electron-hole pairs present significant obstacles to its practical deployment. In this study, we enhanced the photocatalytic efficiency of N 2 fixation by engineering a Mott-Schottky heterojunction and incorporating hollow microreactors. We synthesized Hollow-ZnO (H-ZnO) using ZIF-8 as a precursor and subsequently deposited Cu nanoparticles onto the H-ZnO to create the H-ZnO/Cu photocatalyst. The hollow structure not only bolstered the catalyst’s light scattering and absorption capabilities but also reduced the path length for photogenerated electron transitions, thereby improving the efficiency of electron transport and effectively inhibiting electron-hole pair recombination. Under Xe lamp irradiation, the H-ZnO/Cu-3 photocatalyst achieved a superior NH 4 + yield of 68.1 μmol g −1 h −1 without the addition of any sacrificial reagents, representing a 7.5-fold enhancement over pure ZnO. This research offers a novel strategy for designing metal oxide photocatalysts derived from MOFs and developing cost-effective photocatalytic systems.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qingsong Zhang,Meng Sun,Weidi Qin,Yang Xiao,Chunlei Zhang,Hui Yu,Liangshu Xia
Multilayer ZnO nanoflowers constructed by many nanograins with highly exposed {0001} facet have been prepared. The grain size and exposed {0001} facet is adjusted by hydrothermal condition and citrate-assisted steric hindrance, respectively. Subsequently, the gas sensing performances of the as-prepared ZnO sensors with various hydrothermal temperatures and times were investigated. The detailedly sensing experiments demonstrated that when the hydrothermal temperature and time are 120 °C and 9h, respectively, the obtained ZnO nanoflower sensor (ZnO-120-9) possesses optimal response of 80.3 towards 100 ppm NO x gas concentration at 180 °C. Meanwhile, ZnO-120-9 exhibits excellent selectivity, rapid response and recovery time, and also shows an obvious response signal at 0.5 ppm NO x exposure, which manifests that the lower concentration detection is also attainable. The superior performance of ZnO-120-9 towards NO x is due to the highly exposed {0001} facet and the size comparable to Debye length. As a result, such structure is conducive to the adsorption of more oxygen species and significant reduction of resistance, and they improve the sensitivity of a sensor.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Wenbin Sun,Huazhen Liu,Zilong Guo,Anqi Li,Chuang Gao,Chunxiang Lu,Wenjing Zhou,Jiantao Zhang,Yuanyuan Liu
Piezoelectric materials can actively provide a bioelectric microenvironment by converting mechanical stimulations into electrical signals. Combining the excellent flexibility of piezoelectric polymers and the outstanding piezoelectric properties of piezoelectric ceramics, piezoelectric composites are attractive in tissue repair due to their high response to micromechanical stimulations. However, issues such as agglomeration, dielectric differences, and poor interfacial contact with polymers have limited the role of ceramics in improving the overall properties of the composites. In this work, functionalized multiwalled carbon nanotubes (F-MWCNTs) are applied to disperse zinc oxide (ZnO) in the PVDF–TrFE matrix to prepare electrospun composite fiber films. Through the assistance of hydrogen bonding, F-MWCNTs act as bridges connecting ZnO nanoparticles with PVDF–TrFE, which improves the content and crystallinity of the β phase. Furthermore, this strategy enhances the local electric field and reduces dielectric differences, resulting in improved polarization and piezoelectric properties. Results show that the composite fiber film with 0.35 wt % F-MWCNTs could obtain an open-circuit voltage of up to 8.2 V, a β phase content of 83.36%, and a crystallinity of 57.63%. Meanwhile, due to the synergistic effect of F-MWCNTs and ZnO, the tensile strength and Young’s modulus are increased from 3.5 and 11.0 to 6.6 and 19.49 MPa, respectively. Additionally, cellular experiments show that composite fiber films have good bioactivity and promote cell proliferation and adhesion, especially with 0.35 wt % F-MWCNTs. In conclusion, the composite fiber film possesses good piezoelectric and mechanical properties and enhances the cellular activity, making it a good tissue engineering scaffold.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Kai-Ning Zhang,Ze-Le Lei,Qiu-Feng Lü
The intensification of industrial production has led to a sharp increase in the discharge of toxic organic chemicals and wastewater from printing and dyeing industry. In this study, flower-like ZnO modified TiO 2 @Ti 3 C 2 T x composites (ZnO/TiO 2 @Ti 3 C 2 T x ) were prepared by in-situ oxidation solvothermal method from zinc nitrate hexahydrate and tetramethylammonium hydroxide intercalated Ti 3 C 2 T x . During the solvothermal processes, sodium hydroxide acted as an etchant to further exfoliated the accordion-like Ti 3 C 2 T x into single or few-layer; and at the same time, TiO 2 was formed in-situ on the surface of Ti 3 C 2 T x with simultaneous deposition of flower-like ZnO. The layer structural Ti 3 C 2 T x facilitates the loading and dispersion of ZnO and TiO 2 on its surface. After the in-situ oxidation by solvothermal method, TiO 2 was evenly distributed on the surface of Ti 3 C 2 T x , adjusting the functional groups on the surface of the ZnO/TiO 2 @Ti 3 C 2 T x composite, and improving its adsorption performance. ZnO/TiO 2 @Ti 3 C 2 T x can be used as an efficient adsorbent for malachite green with a high maximum adsorption capacity of 1232.7 mg g −1 , which is higher than that of TiO 2 @Ti 3 C 2 T x (628.57 mg g −1 ). Moreover, a superhydrophilic and underwater superoleophobic ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge was prepared by loading ZnO/TiO 2 @Ti 3 C 2 T x onto polyurethane (PU) sponge. The introduction of ZnO enhances the surface roughness of the ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge, which can effectively separate six oil-water mixtures, and has a high separation flux of 171784 L m −2 h −1 and separation efficiency of 99.6% for cyclohexane-water mixture.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuhui Zeng,Yuanbo Zhang,Meng Peng,Junyang Yin,Weijie Liu,Jianqiao Zhao,Shizhou Tan,Junfeng Liu,Maohua Chen,Zhenyu Chen,Feng Wu,Changqing Chen,Liang Gao,Jiangnan Dai
Cellulose is attracting considerable attention in the field of flexible electronics due to its unique properties and environmental sustainability, particularly as a substrate for flexible devices. Flexible photodetectors are an integral part of cellulose-based devices and have become essential in optical communication, heart rate monitoring, and imaging systems. The performance and adaptability of these photodetectors depend significantly on the quality of the flexible substrates. However, poor bonding with conductive materials results in poor conductivity stability, and limited thermal stability makes cellulose unsuitable for many preparation processes. This study designed polyvinylpyrrolidone (PVP)-coated silver nanowires (AgNWs) as conductive materials, integrating them with cellulose nanofibers (CNFs). The resulting AgNW/CNF composite paper demonstrated high tensile strength (183.9 MPa), low sheet resistance (2.38 Ohm sq–1), and excellent bending durability. Spin-coated PbS colloidal quantum dots (CQDs) films and low-temperature magnetron-sputtered ZnO films were used as functional layers to create a flexible self-powered photodetector. This device features low dark current density (2.35 × 10–9 mA cm–2 @0 V), fast photoresponse (40/24 ms), and stability under bending (up to 180°, 1 mm radius). It shows potential for applications in infrared optical communication and real-time heart rate monitoring, demonstrating the promise of cellulose substrate photodetectors for flexible electronics.
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3369-3389
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IF 2.8
Wang Lu,Rehman Mooeez ur,Jiang Yong,Sun Fan,Zhao Yuanqi,Lu Xiyue,Zhang Zhijun,Liu Wei,Xu Yan,Zhai Yong,Zhao Yujun
With the growing global demand for biodegradable plastics, the hydrogenation of dimethyl maleate (DMM) to produce 1,4-butanediol (BDO), raw materials for poly(butylene succinate), has become one of the hot spots in chemical industry. In this work, we synthesized a series of Cu@C/ZnO–S x catalysts by the method of sorbitol modification for the liquid-phase hydrogenation of DMM. The modification with appropriate sorbitol led to a decoration of carbon on catalyst surface, which improved the copper dispersion and Cu + /(Cu 0 + Cu + ) molar ratio in the Cu@C/ZnO–S 0.08 catalyst. The carbon decoration not only promoted the formation of more copper species having stronger interaction with ZnO, but also enhanced the absorption of ester on catalyst surface. These distinctive properties contributed to the high performance of the Cu@C/ZnO–S 0.08 catalyst in DMM hydrogenation, achieving an excellent BDO yield of 98.4% and superior reusability. The insights into the roles of sorbitol modification could give valuable guidance to the further design of high performance catalysts for esters hydrogenation. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangyu Gan,Zhenpeng Li,Qingrong Yao,Shasha Jiang,Xiaochang Yu,Jianqiu Deng,Zhao Lu,Lichun Cheng,Maomi Zhao,Huaiying Zhou
Polarization loss and conduction loss are the important attenuation mechanisms in dielectric loss dominant electromagnetic wave (EMW) absorbers, but their synergistic effects in different frequency bands need to be further investigated. In this study, FeNi/ZnO/C/Ni 3 ZnC 0.7 composites (FNZC) were synthesized using a simple and environmentally friendly template-sacrificing method, with water as the only solvent. By varying the elemental addition, the phase and microstructure of the final product can be controlled, which in turn affects the conduction loss and polarization loss, thus altering the EMW absorption performance. The minimum reflection loss (RL) value and EAB of the optimized FNZC composite are –49.23 dB and 5.48 GHz (12.32–18.00 GHz), respectively, covering 99.9 % of the Ku band. Additionally, the RLmin values in the S, C, and X bands are below –17 dB. Based on the component regulation strategy and the analysis of electromagnetic parameters, Cole-Cole curves, and EMW absorption performance, it can be concluded that conduction loss is the primary factor contributing to strong absorption of low-frequency EMW. In contrast, interfacial polarization and defect-induced polarization are the main factors for strong absorption of medium- and high-frequency EMW.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hengjia Zhang,Tengchao Guo,Litao Lin,Bin Quan,Xiaohui Zhu,Xiaogu Huang
High temperature material with low infrared emissivity in 3–5 μm waveband plays a crucial role in the infrared stealth capability of hot-end aircraft components. In this study, 3 mol% Ce doped ZnO ceramic powders were annealed at various temperatures to reduce their infrared emissivity. The effects of the annealing temperature on the lattice structure, microscopic morphology, and elemental valence variation in the ZnO ceramic powders were systematically investigated. Additionally, a conductivity–dielectric–lattice vibration synergy theory was proposed to provide insights about the changes in the infrared emissivity of the ZnO ceramic powders. The infrared emissivity of the sample powder gradually decreased to its lowest value (0.092 at 500 °C) as the annealing temperature increased to 1100 °C, exhibiting a U-shaped curve from room temperature to 800 °C. Furthermore, the obtained powder was used as a filler to prepare a low infrared emissivity coating, which exhibited an infrared emissivity of 0.213 in 3–5 μm waveband at 500 °C. An infrared thermographic analysis of the coating indicated that it significantly suppressed infrared radiation at 500 °C, demonstrating an excellent high temperature infrared stealth performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yueming Wang,Yong Men,Lini Liao,Lijie Fu,Zaiwei Lu,Shuyi Xu,Jinguo Wang,Zhenrong Yan,Xuelong Miao
The ZnO/ZrO 2 binary catalyst system has been an emerging and promising catalyst for efficient production of H 2 through methanol steam reforming (MSR). Herein, ZrO 2 supports with different crystalline phases were prepared by the oxygen vacancy engineering strategy of Li doping, and then ZnO/ZrO 2 catalysts were prepared by the isovolumic impregnation method. The different quantities of doped Li have been found to have a significant impact on dominant crystal phase of ZrO 2 supports, which dictates the interaction between ZnO and ZrO 2 and the number of oxygen vacancies. In comparison with ZnO/ZrO 2 -20Li and ZnO/ZrO 2 -40Li catalysts with predominate tetragonal and monoclinic crystal phase, ZnO/ZrO 2 -3Li with a mixed crystalline phase exhibits higher catalytic activity for methanol conversion ( X CH 3 OH ) and CO selectivity (S CO ). Complete methanol conversion of the best performing ZnO/ZrO 2 -3Li catalyst was observed at a very low CO selectivity of 3.1 % at 375 ℃. The XRD, UV, and XPS characterization results indicate that the strong interaction between ZrO 2 and ZnO leads to the appearance of large amount of oxygen vacancies at the ZnO/ZrO 2 interface, which greatly improves the performance of the catalyst. ZnO/ZrO 2 catalyst showed remarkable stability without obvious deactivation after 32 hours of continuous testing. This work highlights the effectiveness of oxygen vacancy engineering of the ZnO/ZrO 2 catalysts for applications in methanol steam reforming and other heterogeneous catalytic systems.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yan Guo,Leilei Kang,Menghua Zhu,Yan Zhang,Xin Li,Ping Xu
Despite the recently reported efficiency over 20%, the long-term stability of perovskite solar cells (PSCs) under ambient conditions remains a great challenge. For most of the highly efficient PSCs, fabrication processes are usually carried out in glovebox to guarantee their performance and stability. Herein, a new manufacturing strategy is introduced to optimize the device performance under ambient conditions. We skillfully merge both of ultrasonic assisted method and a two-step sequential spin-coating deposition technique to prepare a more compact and pinhole-free ZnO and perovskite films in air. As a result, the ZnO-based PSC with a conventional structure of glass/FTO/ZnO/CH 3 NH 3 PbI 3 /Spiro-OMeTAD/Au demonstrate an efficiency of up to 14.25%. Notably, the efficiency can be maintained at 86.25% of its initial value even though it is exposed to air for 45 days. Most importantly, all processes including fabrication, measurement as well as storage are performed in ambient air. We believe the proposed synergetic strategy can open up a new pathway for boosting the commercial applications of PSCs.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yu Ouyang,Xifeng Xia,Haitao Ye,Liang Wang,Xinyan Jiao,Wu Lei,Qingli Hao
In this work, we synthesized the hierarchical ZnO@C@NiO core–shell nanorods arrays (CSNAs) grown on a carbon cloth (CC) conductive substrate by a three-step method involving hydrothermal and chemical bath methods. The morphology and chemical structure of the hybrid nanoarrays were characterized in detail. The combination and formation mechanism was proposed. The conducting carbon layer between ZnO and NiO layers can efficiently enhance the electric conductivity of the integrated electrodes, and also protect the corrosion of ZnO in an alkaline solution. Compared with ZnO@NiO nanorods arrays (NAs), the NiO in CC/ZnO@C@NiO electrodes, which possess a unique multilevel core–shell nanostructure exhibits a higher specific capacity (677 C/g at 1.43 A/g) and an enhanced cycling stability (capacity remain 71% after 5000 cycles), on account of the protection of carbon layer derived from glucose. Additionally, a flexible all-solid-state supercapacitor is readily constructed by coating the PVA/KOH gel electrolyte between the ZnO@C@NiO CSNAs and commercial graphene. The energy density of this all-solid-state device decreases from 35.7 to 16.0 Wh/kg as the power density increases from 380.9 to 2704.2 W/kg with an excellent cycling stability (87.5% of the initial capacitance after 10000 cycles). Thereby, the CC/ ZnO@C@NiO CSNAs of three-dimensional hierarchical structure is promising electrode materials for flexible all-solid-state supercapacitors.
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