APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Xiangjuan Yuan,Shule Duan,Guangyu Wu,Lei Sun,Gang Cao,Dongya Li,Haiming Xu,Qiang Li,Dongsheng Xia
A series of functional organic-metal zinc oxide (ZnO) doped graphitic carbon nitride (g-C 3 N 4 ) denoted as ZnO-CN composites were fabricated via a facile mixing and calcination approach. The composition, structure, and morphology of the as-prepared ZnO-CN composites were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area, fourier transform infrared (FT-IR), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), respectively. When loading amount of ZnO is 0.1 and calcination temperature is 650 °C (denoted as ZnO-CN 0.1 -650), the kinetic constant of atrazine (ATZ) degradation was 2.73 min −1 , which was almost 10.5 times higher than that of ozone alone, exhibiting the highest catalytic ozonation activity. The results of the characterization indicated that ZnO-CN 0.1 -650 presents the mesoporous structure in laminated g-C 3 N 4 and Zn(II) are strongly coordinated and stabilized within the electron-rich g-C 3 N 4 framework. The feasibility of ZnO-CN 0.1 -650 for practical application was further evaluated at different catalyst dosages, initial ATZ concentrations, solution pHs, and natural organic matters. Radical scavengers experiments demonstrated that O 2 − , OH, and 1 O 2 are the dominant reactive radical species. In addition, the composite showed excellent stability for pollutants removal over multiple reaction cycles. A possible mechanism of the enhanced catalytic ozonation activity is attributed to the host-guest interaction between ZnO and g-C 3 N 4 , as well as the improved meso-porosity, increased surface area, and intensive mass and electron transfer ability ascribed to the electronic and surface properties modification. Overall, the ZnO-CN 0.1 -650 composite is demonstrated to be a highly efficient, stable, and recoverable catalyst, which provided a promising alternative in catalytic ozonation.
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DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 4
·325
·
IF 2.404
Liqing Liu,Hui Wang,Dehao Wang,Yongtao Li,Xuemin He,Hongguang Zhang,Jianping Shen
The ZnO@TiO2core/shell nanowire arrays with different thicknesses of the TiO2shell were synthesized, through depositing TiO2on the ZnO nanowire arrays using the pulsed laser deposition process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that these core/shell nanowires were homogeneously coated with TiO2nanoparticles with high crystallinity, appearing to be a rather rough surface compared to pure ZnO nanowires. The efficiency of ZnO@TiO2core/shell structure-based dye-sensitized solar cells (DSSCs) was improved compared with pure ZnO nanowires. This is mainly attributed to the enlarged internal surface area of the core/shell structures, which increases dye adsorption on the anode to improve the light harvest. In addition, the energy barrier which formed at the interface between ZnO and TiO2promoted the charge separation and suppressed the carrier recombination. Furthermore, the efficiency of DSSCs was further improved by increasing the thickness of the TiO2shell. This work shows an efficient method to achieve high power conversion efficiency in core/shell nanowire-based DSSCs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lili Yan,Min Zhang,Shichao Zhao,Tijian Sun,Bin Zhang,Maosheng Cao,Yong Qin
Yolk–shell and one-dimensional structures are promising microwave absorption structures due to the microwave multi-reflection and scattering sites of yolk–shell structure, and the conductive network that is easily formed by one-dimensional structure. The wire-in-tube structure may be a more effective microwave absorption structure because it combines the advantages of one-dimensional and yolk–shell structures. However, conventional methods are difficult to realize such a structure because of the weak controllability of the structure, and it is impossible to tune the absorption band or optimize the absorption performance by precisely tailoring the structure. Molecular layer deposition (MLD), with excellent structure controllability, is an effective strategy to overcome this problem. In this work, a novel wire-in-tube ZnO@carbon nanostructure was realized by polyimide MLD–calcination strategy. The ZnO cores and carbon shells form voids between them by a redox process during calcination, conducive to microwave multi-refection and scattering. More importantaly, by tuning the number of deposition cycles, the carbon shell thickness can be adjusted at the atomic scale so as to modulate the absorption bands effectively. Maximum absorption of −50.05 dB and a bandwidth of 5.68 GHz are simultaneously achieved at a matching thickness of 2.0 mm. The polyimide MLD–calcination strategy not only provides a novel wire-in-tube structure with remarkable microwave absorption performance, but diversifies carbonaceous material fabrication methods, extending the applications to supercapacitors, sensing, catalysis, and the biomedical fields.
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Zhongwei Ge,Chenglei Wang,Tao Chen,Zhiyan Chen,Tong Wang,Liang Guo,Genggeng Qi,Jianqiang Liu
It has been reported that doping ZnO with metal ions can alter the band gap and immensely enhance electron transport . In this regard, to increase the efficiency of cost-effective dye-sensitized solar cells (DSSCs), we synthesized Cu-doped ZnO nanocomposites from layered double hydroxide (LDH) precursors via a facile method. LDH layers were homogeneously doped with Cu ions , and mixed metal oxides (MMOs) were obtained after annealing. The morphology and optical and electrochemical properties of the as-synthesized Cu-doped ZnO nanocomposites were systematically studied. The introduction of Cu ions increases the specific surface area of ZnO and increases light absorption in the visible region. The Cu-doped ZnO MMOs were used as the photoanode of DSSCs, and the effect of the amount of the Cu dopant on the performance of the solar cells was studied. At the optimal doping weight percentage of Cu (0.25 wt%), the solar cell based on Cu-doped ZnO MMO and D149 dye achieved the highest short-circuit current of 7.12 mA cm −2 and the highest power conversion efficiency of 1.50%.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 25
·11454-11467
·
IF 3.5
Yuan Yiheng,Yang Li,Peng Xishun,Chen Qixin,Li Xinghua,Zuo Cheng,Zhou Zhangyu,Bai Zhongchen
Here, we passivated the interfacial defects of ZnO/CsPbBr 3 by inserting a NaSCN layer between the ZnO electron transport layer and the CsPbBr 3 layer to improve the photoelectric conversion efficiency of ZnO/CsPbBr 3 /Carbon structure solar cell. The addition of the NaSCN optimized the morphology of the ZnO surfaces to decrease effectively the roughness. Furthermore, The passivated ZnO electron transport layer improved the deposition quality of CsPbBr 3 films, which reduced the defects at the interface between the ZnO electron transport layer and CsPbBr 3 layer, suppressing non-radiative recombination to enhance device photovoltaic performance. Synergistic passivation of SCN − and Na + ions plays an important role in obtaining high-quality CsPbBr 3 films for boosting the power conversion efficiency (PCE) of the device. Moreover, the passivated solar cells had longer stability than the pristine ones after being placed for 1000 h in the air and at room temperature.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zijian Wang,Dongzhi Zhang,Mingcong Tang,Yajing Chen,Yuehang Sun,Qingdong Chen,Jingdu Bian,Xingyan Shao
Hydrogen (H 2 ) is considered one of the promising energy sources to replace fossil fuels so efficient H 2 sensing technology is a necessary condition to ensure the safety of people’s livelihood and economic development. In this paper, ZnO obtained by calcination of precursor ZIF-8 has a regular dodecahedral structure. The product of In 2 O 3 obtained with the participation of the surfactant PEO-PPO-PEO has two different crystal forms, namely cubic phase c-In 2 O 3 and hexagonal h-In 2 O 3 . Crystal form c-In 2 O 3 is 7.07 wt% of the mass of h-In 2 O 3 . When ZnO is 5 wt% of In 2 O 3 , the H 2 sensor based on the ZnO (5 %)-Inc/Inh composite material has the best response performance and the operating temperature is 450 °C. The sensor’s response time for detecting 5000 ppm H 2 is less than 1 s, and the recovery time is 6 s with a response intensity of 79.91. The limit of detection (LOD) is 53 ppb, which is much lower than the explosive concentration (4–75 V/V%). Density functional theory (DFT) is utilized for investigating the performance advantages of Inc/Inh composites over pure c-In 2 O 3 and h-In 2 O 3 and further elaborating the mechanism of ZnO improving the gas-sensing performance of ZnO (5 %)-Inc/Inh. The sensor based on ZnO (5 %)-Inc/Inh composite may guide the research of high-performance H 2 sensors. The H 2 adsorption mechanism of the sensor was analyzed based on the oxygen adsorption mechanism.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junping Shi,Lielin Wang,Hua Xie,Shidi Yao,Xiuqi Pu,Zhu Liu,Xiaojiang Chen,Yun Ding
Highly reactive fission product cesium may volatilize at high temperatures. PbO–B 2 O 3 –ZnO glass with low melting temperature and excellent chemical durability can be used as a potential matrix for immobilizing Cs. In this work, five PbO–B 2 O 3 –ZnO glasses with different contents of Pb were synthesized via a melt-quenching process. These specimens were characterized with XRD , Raman, DTA and viscosity measurements . The results showed that the melting temperature decreases, viscosity decreases and structural polymerization increases with increasing lead content. Cs-doped 35PbO–60B 2 O 3 –5ZnO glasses were synthesized at low temperatures. XRD results revealed the amorphous nature of the glass solidified bodies. EDS and ICP-MS studies confirmed that Cs is retained in the glass. Clear vitrified waste products containing up to 13.6 wt% Cs were obtained. The chemical durability of the samples was evaluated via PCT-A and MCC-1 method. For the glass solidified body comprising a Cs/matrix ratio of 0.136, the leaching rate of Cs was 1.6 × 10 −1 g m −2 d −1 from the PCT test, which indicates that it has a good chemical stability. 35PbO–60B 2 O 3 –5ZnO glass was expected to be a suitable matrix for Cs immobilization.
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DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Xuepeng Lu,Yong Zheng,Zuowei Dong,Qi Huang
The novel low-temperature sinterable 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics were prepared by cofiring the mixtures of pure-phase Li 2 ZnTi 3 O 8 , Li 2 TiO 3 and ZnO–B 2 O 3 –SiO 2 glass. Li 2 ZnTi 3 O 8 and Li 2 TiO 3 phase could well coexist in the sintered samples with no second phase detected. The near-zero temperature coefficients of the resonant frequency ( τ f ) were achieved and simultaneously the desirable quality factor Q × f values could be maintained. Typically, the 0.6Li 2 ZnTi 3 O 8 –0.4Li 2 TiO 3 ceramics with 1.0 wt% ZBS addition could be well densified at only 900 °C and exhibited excellent microwave dielectric properties of ε r =25.4, Q × f =86,400 GHz and τ f =−1.0 ppm/°C, thus showing a great potential as a middle permittivity low-temperature cofired microwave dielectric material .
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Jialin Liu,Jiayin Huang,Zhiheng Hu,Gaoshang Li,Lingping Hu,Xin Chen,Yaqin Hu
The function of chitosan film was reinforced by ZnO nanoparticles and antioxidant of bamboo leaves (AOB) for food packaging application. The results of structural characterization indicated the good compatibility among chitosan, ZnO nanoparticles and AOB. The chitosan film had the best mechanical strength and the highest light transmittance. The addition of AOB remarkably reduced the UV light transmittance and significantly enhanced the antioxidant activity of the films. Meanwhile, AOB and ZnO nanoparticles synergistically enhanced the antibacterial activity against E. coli and S. aureus . Our results suggested that the chitosan/ZnO/AOB films could be applied as potential active packaging materials in food industry to extend the shelf-life of packaged food.
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Lingling Zheng,Ming Li,Shijie Dai,Yinghao Wu,Yuhang Cai,Xinyu Zhu,Shaokun Ma,Daqin Yun,Jian-Feng Li
In recent years, semitransparent organic solar cells (ST-OSCs) receive more and more attention due to their applications in building-integrated photovoltaics. There is a complicated trade-off between the average visible transmittance (AVT) and the power conversion efficiency (PCE), which determine the overall light utilization efficiency (LUE) of ST-OSCs. In this work, the ST-OSCs are fabricated using ZnO as the buffer layer between an ultrathin metal electrode and an active layer of PM6:Y7. Moreover, Ag nanowires (Ag NWs) are embedded into ZnO film to increase the conductivity without serious loss of AVT. The LUE improves to 2.63% with a PCE of 13.76% and an AVT of 19.09% for ST-OSC with modification. Significant enhancement of the short-circuit current density and electrical property of the device is attributed to the excellent conductivity, the scattering effect, and the surface plasmon resonance of Ag NWs. This study provides an efficient strategy to fabricate high-performance ST-OSCs with high LUE.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1064-1069
·
IF 3.1
He Huan,Zou Zhengxi,Hua Weiming,Yue Yinghong,Gao Zi
A series of ZnO-modified cobaltous ion exchanged ZSM-5 catalysts is prepared using incipient wetness impregnation and characterized by X-ray diffraction (XRD), N 2 adsorption, transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DR UV-Vis), X-ray photoelectron spectroscopy (XPS), pyridine-adsorbed Fourier transform infrared (Py-IR) and Raman. Their catalytic performance towards CO 2 -assisted dehydrogenation of ethane to ethylene has been evaluated. The addition of ZnO onto CoZSM-5 obviously improved the yield of ethylene as well as the conversion of CO 2 . The promoting effect is attributed to the good activity of ZnO for the reverse water gas shift (RWGS) reaction, which enhances the coupling between RWGS and ethane dehydrogenation.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hang Liu,Jinkai Zhang,Chuanyu Yang,Runkang Lv,Yihao Wen,Yuhong Zhang
In this paper, the nanosheet structure of Gd-doped ZnO nanosheets is prepared by single-step hydrothermal method. The gas sensitive performance of Gd-doped ZnO nanosheets is investigated. The Gd-ZnO sensor not only improves the response to ethanol gas by a factor of 11.8 compared to a pure ZnO sensor, but also reduces the optimal working temperature by 20 °C. The response/recovery time are also reduced to varying degrees. In addition, the Gd-ZnO sensor maintain a certain performance to ethanol gas under different humidity conditions. This article elaborates on the sensing mechanism of the Gd-ZnO sensor for ethanol gas. The research in this paper opens up a new idea for improving zinc oxide sensors.
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