SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Qian Huang,Zhongzhen Wu,Hao Wu,Shunping Ji,Zhengyong Ma,Zhongcan Wu,Pinghu Chen,Jiayu Zhu,Ricky K.Y. Fu,Hai Lin,Xiubo Tian,Feng Pan,Paul K. Chu
Aluminum alloys are widely used in the aerospace and transportation industries, but the corrosion resistance is insufficient in long-term service especially in the high salinity environment. A ceramic coating composed of ZnO nanoparticles is demonstrated to significantly improve the corrosion resistance of the Al alloys. Owing to the similar chemical activity of Zn and Al, ZnO particles fuse into Al 2 O 3 in the micro-arc during plasma electrolytic oxidation (PEO) rendering the coating compactness. The formation mechanism of the PEO coating is investigated and discussed. The corrosion current of the ZnO modified PEO coating is 4 orders of magnitude less than that of the LY12 substrate. Immersion tests performed in 3.5 wt% sodium chloride show that incorporation of ZnO prevents destruction and dissolution of the PEO coating in the high salinity environment.
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DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 7
·3281-3288
·
IF 2.394
Yang He,Chang Limin,Wang Limin,Yin Dongming,Wang Duo,Cheng Yong
The advanced electrode construction consisting of Ni foam uniformly covered by layered ZnO microspheres (ZnO@Ni LMs) is successfully assembled by a simple thermal treatment process followed by a mild annealing treatment, which can be directly used as a binder-free electrode for lithium-ion batteries (LIBs). The as-synthesized ZnO@Ni LMs consist of numerous nanoparticles, leaving abundant porous to mitigate the volume changes between charge-discharge process. Remarkably, binder-free electrode circumvents the addition of insulating material (binder) and inhomogeneous distribution of conductive carbon material on current collector. When evaluated as binder-free electrode for LIBs, ZnO@Ni LMs deliver a superior specific capacity (1144 mA h g −1 at 100 mA g −1 ), brilliant rate capability, and excellent cycling ability (565 mA h g −1 at 100 mA g −1 after 100 cycles).
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Jingjing Du,Mingxiang Qv,Yuyan Zhang,Xiaoyun Yin,Ning Wan,Baozhong Zhang,Hongzhong Zhang
With the development of nanotechnology, nanomaterials have been widely applied in anti-bacterial coating, electronic device, and personal care products. NanoZnO is one of the most used materials and its ecotoxicity has been extensively studied. To explore the potential phototoxicity of nanoZnO induced by visible light, we conducted a long-term experiment on litter decomposition of Typha angustifolia leaves with assessment of fungal multifaceted natures. After 158 d exposure, the decomposition rate of leaf litter was decreased by nanoZnO but no additional effect by visible light. However, visible light enhanced the inhibitory effect of nanoZnO on fungal sporulation rate due to light-induced dissolution of nanoZnO. On the contrary, enzymes such as β-glucosidase, cellobiohydrolase, and leucine-aminopeptidase were significantly increased by the interaction of nanoZnO and visible light, which led to high efficiency of leaf carbon decomposition. Furthermore, different treatments and exposure time separated fungal community associated with litter decomposition. Therefore, the study provided the evidence of the contribution of visible light to nanoparticle phototoxicity at the ecosystem level.
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DOI
PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·143-151
·
IF 0
Du Jianzeng,Li Yonghong,Miao Zhenyu
Novel Ni/ZnO – HZSM-5 adsorbents were synthesized by incipient wetness impregnation. The Ni/ZnO – HZSM-5 adsorbent can achieve deep desulfurization and olefin aromatization at the same time. Thiophene sulfur was removed from 495 to less than 10 ppm via reactive adsorption desulfurization (RADS). Olefins were also converted into aromatics. HZSM-5 did not only support adsorbents but also cooperated with active Ni sites to catalyze olefins into aromatic hydrocarbons. Aromatization of 1-pentene, 2-pentene, 2-methyl-2-butene, and 1-hexene on adsorbents was investigated. The adsorbents were characterized by the Brunauer–Emmett–Teller, X-ray diffraction, temperature-programmed reduction, and temperature-programmed desorption of ammonia and thermogravimetric analysis. The experimental results showed that strong acids on the adsorbent disappeared after HZSM-5 loaded active metal sites, and almost no coke was generated on adsorbents in RADS.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
You Liang,Yongheng Duan,Chen Fan,Hongqiang Dong,Jiale Yang,Jingyue Tang,Gang Tang,Weichen Wang,Na Jiang,Yongsong Cao
Controlled release formulations can reduce the losses of pesticides and prolong their effective duration. In this work, a novel pH responsive pesticide delivery system based on kasugamycin-conjugated ZnO quantum dots (KAS-ZnO QDs) was established via a cleavable benzoic–imine covalent bond. The as-prepared KAS-ZnO QDs could protect KAS against photodegradation effectively due to the UV shielding effect of KAS-ZnO QDs. The KAS and Zn 2+ released from KAS-ZnO QDs in the acid condition could achieve a synergistic antimicrobial activity. The greenhouse experiment confirmed that application of KAS-ZnO QDs had a longer duration and a better antimicrobial activity against bacterial fruit blotch compared to KAS and NH 2 -ZnO QDs treatments, and showed no any toxicity to plants. Thus, pH-responsive KAS-ZnO QDs could achieve a synergistic antimicrobial effect and offer a new approach to manage plant diseases.
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DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Yun-Chuan Pu,Shui-Rong Li,Shuai Yan,Xiao Huang,Duo Wang,Yue-Yuan Ye,Yun-Quan Liu
Copper sintering at temperatures above 200 °C has been a big challenge for the application of copper-based catalysts in methanol reforming for hydrogen production. In the present work, a Cu/ZnO catalyst promoted by Sc 2 O 3 was developed, which is capable of converting methanol into hydrogen-rich gas with good activity and decent stability in the temperature range of 220–600 °C. The role of Sc in Cu/Sc 2 O 3 -ZnO catalysts was explored through the XRD, H 2 -TPR, N 2 O chemisorption, TEM, Raman, and XPS analyses. The results indicated that ZnO lattice was doped with the Sc 3+ ion, which led to increased metal dispersion, strengthened interaction between Cu metal and support oxide, and subsequently enhanced catalytic activity and stability of the Cu/Sc 2 O 3 -ZnO catalyst in methanol reforming for hydrogen production.
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DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Jiaxiong Liu,Dehua He
ZnWO 4 -ZnO catalysts with different W content were prepared by conventional hydrothermal and wet impregnation methods and applied in the direct synthesis of glycerol carbonate from CO 2 and glycerol. The crystallite structure, texture property, morphology, redox and acid-base properties and the surface chemical situation of the catalysts were characterized by XRD, BET, TEM, H 2 -TPR, NH 3 /CO 2 -TPD and XPS. The possible activation routes of CO 2 and glycerol were analyzed with DRIFTS and FTIR. ZnWO 4 -ZnO composite catalysts showed better catalytic performances with respect to ZnO in the carbonylation of glycerol with CO 2 . The improved activity of ZnWO 4 -ZnO catalysts was associated with the formation of ZnWO 4 , the interaction between ZnWO 4 and ZnO, and the enhanced moderate acidic property. DIRFTS results showed that chelating bidentate carbonate species was the main adsorption pattern for CO 2 on ZnO, while the introduction of W led to the bridged bidentate carbonate, which became the main adsorption pattern on ZnWO 4 -ZnO. As for the activation of glycerol, zinc glycerolate played an important role in the reaction process. Based on the reaction and characterization results, a plausible reaction route involved a seven-membered ring esters intermediate was suggested for the reaction of CO 2 and glycerol over ZnWO 4 -ZnO catalysts.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Hao Yang,Qingxia Zhang,Ying Chen,Yong Huang,Fang Yang,Zhong Lu
ZnO coated fabrics have attracted wide attentions due to their antibacterial and photocatalytic self-cleaning properties. However, the photo-response of ZnO only in ultraviolet region limits its application. In this paper, ZnO/BiOBr functionalized cotton fabrics were synthesized by a facile and time-saving ultrasonic-microwave combined method. Compared with ZnO coated fabric, the photocatalytic activity of ZnO/BiOBr coated fabric under visible light irradiation was remarkably improved at no sacrifice of its antibacterial activity. Simultaneously, it also showed good resistance to bacterial adhesion and photocorrosion. The introduction of two-dimensional BiOBr nanoflakes not only enhanced the visible light absorption, but also reduced the recombination rate of electron-hole pairs, thus significantly improving the photocatalytic self-cleaning performance of the coated fabric under visible light irradiation. The ZnO/BiOBr coated cotton fabric with both antibacterial and self-cleaning functionalities may have broad application prospects in the fields of textile, medicine and chemical industry.
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DOI
PubMed
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2018
·Vol. 233
·期 3
·347-359
·
IF 1.144
Zuming He,Yongmei Xia,Bin Tang,Jiangbin Su,Xingfang Jiang
A series of magnetically recyclable NiFe 2 O 4 /ZnO nanocomposites have been successfully fabricated by a facile two-step route. The as-prepared NiFe 2 O 4 /ZnO nanocomposites were characterized by X-ray diffraction, field-emission scanning electron microscopy, vibrating sample magnetometer, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The results demonstrate that the NiFe 2 O 4 /ZnO nanocomposites are composed of ZnO particles (50–120 nm) integrated with NiFe 2 O 4 particles (30–80 nm) . Compared with bare ZnO, the NiFe 2 O 4 /ZnO nanocomposites exhibit evidently enhanced visible light absorption and decreased recombination of photo-generated electron-hole pairs. Moreover, the nanocomposites exhibit enhanced photocatalytic performance for the degradation of methylene blue under simulated solar light irradiation when compared with bare ZnO, and the 20%-NiFe 2 O 4 /ZnO nanocomposite is observed as the optimal composite. This is ascribed to the more efficient separation of photo-generated electron-hole pairs and generation of hydroxyl (˙OH) radicals in the 20%-NiFe 2 O 4 /ZnO nanocomposite. Furthermore, the NiFe 2 O 4 /ZnO nanocomposites have a high saturation magnetization, indicating that they can be magnetically separated and recycled from organic dye wastewater.
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2018
·Vol. 52
·期 3
·035501
·
IF 2.373
Weiwei Xia,Lingzhi Guan,Xianghua Zeng,Jinpeng Yang,Hui He,Yunqing Cao
Vertically aligned quasi two-dimensional (2D) ZnO nanorods (NRs) on carbon fiber paper were prepared by a modified hydrothermal approach, an individual ZnO nanorod has a diameter of 100–200 nm and a length of ~1 µm. ZnO/ZnS core-hell hierarchal structures with an outer ZnS shell of ~25 nm were fabricated under an elaborate sulfidation treatment. Compared to ZnO NRs a depressed near band emission at 380 nm and a significant enhanced visible light emission around 500 nm were observed for the ZnO/ZnS core-hell NRs from photoluminescence spectra. XPS and ESR measurements were carried out to study the ions constituents and the defects of the prepared samples. The prepared samples were used as photoelectrodes in visible-light self-powered photoelectrochemical cell-type detector. And an enhanced photocurrent of 6.79 µA was obtained, which is ten times as high as that of the bare ZnO electrode. The results show that the existence of sulfur vacancies and the formation of ZnO/ZnS heterostructure were able to promote photocurrent performance, the former increases the carrier concentration and leads to an upshift of work function; the latter makes the band bend and the photogenerated e–p pairs can be separated efficiently. The results will be helpful to implement visible-light device based on heterostructure via interfacial engineering.
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高影响因子
Solar RRL
·
2018
·Vol. 2
·期 12
·1800240
·
IF 0
Detao Liu,Yafei Wang,Zhen She,Hualin Zheng,Peng Zhang,Feng Wang,Jiang Wu,Zhi Chen,Shibin Li
Although ZnO is an attractive electron transport layer (ETL) for high performance perovskite solar cells (PSCs) due to its suitable energy structure, high electron mobility, and low-temperature process, perovskite films on ZnO are decomposed rapidly as the substrate is heated over 90 °C. However, the annealing temperature higher than 90 °C is mandatory to produce high quality perovskite films. Here, for the first time, the use of an ultra-thin self-assembly monolayer (SAM) of methoxysilane on ZnO ETL to suppress the decomposition of perovskite films is reported. A self-form solvent annealing (SFSA) method is also carried out to improve the crystal quality of perovskite, and the champion device of SAM modified ZnO based PSCs yields a PCE of 18.34%. All these processes are conducted at low temperature and compatible with fabrication of flexible devices.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 32
·12303-12314
·
IF 4.052
Haoqing Tang,Tao Liu,Zhiyuan Tang
ZnO materials with multidimensional stereoscopic morphologies were synthesized via a one-step solvothermal process with water, ethanol and acetone as solvents. In this work, well-prepared ZnO was used as a Zn source for preparing pristine Li2ZnTi3O8 anode materials for the first time by a facile solid-state method. The resulting Li2ZnTi3O8 electrode material with rice-shaped ZnO as the zinc source (LZTO-E) possessed a smaller particle size and larger specific surface area, which were conducive to increase the electrochemical reaction area. Impressively, the LZTO-E electrode showed an excellent electrochemical performance with large discharge capacity (253.4 mA h g−1 at 100 mA g−1) and good cycling stability (175 mA h g−1, 133.4 mA h g−1, and 115.0 mA h g−1 at 1000 mA g−1, 2000 mA g−1, and 5000 mA g−1 after 500 cycles, respectively). This superior electrochemical performance of the as-synthesized Li2ZnTi3O8 was attributed to the specific microtopography of ZnO.
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高影响因子
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