JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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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
ACS Applied Energy Materials
·
2023
·
IF 6.4
Lixin Chen,Xiaorui Yu,Zhe Hua,Qing Liu,Vladimir An,Lizhi Feng,Jiaming Guo,Xinglai Zhang,Jing Li,Baodan Liu
Photoelectrochemical water splitting based on suitable catalysts has attracted wide attention as a promising strategy to utilize solar energy to produce clean and renewable hydrogen fuel. Herein, we reported cobalt phosphate-modified (GaN)1–x(ZnO)x/GaN nanowire arrays on a high-temperature conductive GaN substrate toward enhanced photoelectrochemical water splitting by a facile two-step Au-assisted chemical vapor deposition method. The highly conductive Si-doped GaN substrate is designed to serve as a current collector and epitaxial substrate to grow GaN nanowires at high temperature. Meanwhile, high density of branched (GaN)1–x(ZnO)x nanowires with a tunable band gap, strong visible-light absorption, and high catalytic activity is deposited on the surface of GaN nanowires to act as active components to harvest light toward the oxygen evolution reaction. Such multi-junction heterostructures effectively enhance wide spectral utilization and light absorption and simultaneously accelerate the separation of electrons and holes and the transfer of photogenerated electrons from (GaN)1–x(ZnO)x nanowires to the GaN substrate collector and Pt electrode. The photocurrent density of the (GaN)1–x(ZnO)x/GaN nanowire array photoanode can reach 37.5 μA cm–2 at 1.23 V vs reversible hydrogen electrode and could be further enhanced to 186 μA cm–2 by modifying the cobalt phosphate cocatalyst, showing promising potential in clean hydrogen production.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jiacheng Yan,Zeming Tang,Binxin Li,Da Bi,Qingxue Lai,YanYu Liang
With the advantages of low cost, non-pollution, and strong controllability over composition, morphology, nanostructures, as well as surface characters, carbon-based nanomaterials are regarded as ideal substitutes of traditional platinum-based catalysts for oxygen reduction reaction (ORR) electrocatalysis in ORR-involved devices. Herein, an in situ ZnO activation-coupled electrospinning strategy was employed to facilely construct nitrogen-doped porous carbon nanofibers (NPCNF) for flexible Zn–air batteries. In situ formation and thermal removal of ZnO make a critical difference in construction of micro/meso-hierarchically porous structures as well as highly active N-doped sites, therefore generating self-standing carbon nanofibers with high nitrogen doping content as well as specific Brunauer–Emmett–Teller of 501 m2/g and 5.6 at. %. As a result, the prepared NPCNF as a self-standing electrode delivers an excellent performance both in alkaline liquid-state and quasi-solid-state Zn–air batteries, giving the possibility of applications in flexible devices.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Xuebin Hou,Sarah Louise Stanley,Min Zhao,Jin Zhang,Huimin Zhou,Yibing Cai,Fenglin Huang,Qufu Wei
As the most widely used metal oxide catalysts in photocatalytic degradation, the fast recombination of charge carriers limits the photocatalytic performance of multiform TiO 2 , resulting from its direct-band-gap property. In the present work, we designed C-doped coupled TiO 2 /ZnO nanofibrous membrane based on the derivation of ZnO from the metal organic framework (MOF). The morphology and catalytic properties of the composite membrane could be manipulated by the growth of ZIF-8 crystals. Compared to pristine TiO 2 nanofibers (11.4341 m 2 g −1 ), the composite membrane with an optimized ZnO cubes exhibited larger specific surface area (30.2475 m 2 g −1 ) after introducing ZnO cubes. Furthermore, the crossed-network connection between TiO 2 and ZnO cubes is propitious to increase the synergy of the heterojunction , subsequently effectively inhibiting the recombination of photogenetrated holes and electrons. Benefitting from the trinomial synergistic effect of carbon doping, ZnO and TiO 2 , the as-designed composite membrane exhibited excellent photocatalytic performance to Rhodamine compared to pure TiO 2 nanofibers. This study not only presents the strategy of preparing a C-doped coupled TiO 2 /ZnO composites with crossed network connection for effective photocatalysis , but also exploit the application of MOFs.
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高影响因子
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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高影响因子
ACS Applied Nano Materials
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2018
·
IF 0
Jing Qiao,Dongmei Xu,Longfei Lv,Xue Zhang,Fenglong Wang,Wei Liu,Jiurong Liu
In this work, hollow ZnO/Co hybrid nanotubes are prepared by electrospinning followed by calcination and hydrogen reduction process for electromagnetic wave absorption. The texture and electromagnetic wave absorption performance of ZnO/Co hybrid nanotubes with different Co contents are thoroughly investigated. Among the studied hybrid nanotubes, ZnO/Co hybrid nanotubes with the same molar concentrations exhibit superb electromagnetic wave absorbing property. The maximum reflection loss reaches −68.4 dB at 11.4 GHz with a matching thickness of 3.0 mm and the maximum effective absorption (reflection loss ≤ −10 dB) bandwidth is up to 5.9 GHz (9.5–15.4 GHz) with a matching thickness of 2.6 mm. The superior property could be attributed to the favored impedance matching performance and various loss pathways including natural resonance, interfacial polarizations, dipole polarization, and conductive loss. The unique three-dimensional network structure formed by nanotubes further contributes to the loss performance. The hollow ZnO/Co hybrid nanotubes can be utilized as an ideal candidate for lightweight and high-efficiency electromagnetic wave absorption materials.
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DOI
International Journal of Electrochemical Science
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2023
·
IF 1.5
Shouhui Chen,Rihui Zhou,Yaqin Chen,Ping Li,Yonghai Song,Li Wang
Zeolitic imidazolate frameworks are a class of metal organic frameworks which are very attractive for their pore structures. However, their pore size and the BET surface would shrink when they underwent heat treatment at high temperature. On the other hand, liquid metal in MOFs might flow through the pores and prevent the shrinkage when pyrolysis. As is known that metallic Sn is liquid when the temperature is above 232 °C, flowing Sn might support and maintain the porous structure of MOFs during the pyrolysis. In this work, porous Sn/C-ZnO core-shell structures were prepared as anodes for LIBs via a two-step method. Firstly, SnO 2 particles were encapsulated in a ZIF-8 layer with different thickness. Then Sn/C-ZnO was generated in inert atmosphere at 700 °C. A Sn/C-ZnO composite, with 11.2% of Sn and 21.0% of ZnO in content, had a BET surface of 32.9 m 2 g -1 . Another Sn/C-ZnO composite, with 55.1% of Sn and 1.8% of ZnO in content, had a larger BET surface of 297 m 2 g -1 . Then the two composites were tested as anodes for LIBs. Although the BET surface of the former was significantly less than that of the latter before cycling and the content of Sn in the former was also much lower than that of the latter, the discharge capacity of the former after 50 cycles was 515.6 mAh g -1 at 100 mA g -1 in the potential of 0.01~3.00 V, which was slightly higher than that of the latter.
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高影响因子
ACS Applied Materials & Interfaces
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2012
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IF 4.525
Wei Wu,Shaofeng Zhang,Xiangheng Xiao,Juan Zhou,Feng Ren,Lingling Sun,Changzhong Jiang
Mesoporous spindlelike iron oxide/ZnO core–shell heterostructures are successfully fabricated by a low-cost, surfactant-free, and environmentally friendly seed-mediate strategy with the help of postannealing treatment. The material composition and stoichiometry, as well as these magnetic and optical properties, have been examined and verified by means of high-resolution transmission electron microscopy and X-ray diffraction, the thickness of ZnO layer can be simply tailored by the concentration of zinc precursor. Considering that both α-Fe2O3 and ZnO are good photocatalytic materials, we have investigated the photodegradation performances of the core–shell heterostructures using organic dyes Rhodamin B (RhB). It is interesting to find that the as-obtained iron oxides/ZnO core–shell heterostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to the as-used α-Fe2O3 seeds and commercial TiO2 products (P25), mainly owing to the synergistic effect between the narrow and wide bandgap semiconductors and effective electron–hole separation at the interfaces of iron oxides/ZnO.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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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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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
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Ting Chen,Long Zhang,Zhaoxing Zhang,Peng Li,Hongqiang Wang,Chuang Yu,Xinlin Yan,Limin Wang,Bo Xu
Despite the high ionic conductivity and good machinability, the application of sulfide solid electrolytes (SEs) is severely limited by the poor compatibility of oxide cathodes with Li metals. Herein, a ZnO co-doping strategy is proposed to enhance the chemical and electrochemical performance of sulfide SEs. Given the synergistic effect by incorporation of ZnO, the argyrodite electrolyte achieves superior interfacial stability and Li dendrite suppression capability. By in-depth ex situ analyses, the enhancement is ascribed to LiZn and Li3OBr formed in the argyrodite/Li interface and a reduced electronic conductivity arising from the ZnO doping. In addition, O doping improves the air stability for argyrodite without degrading the ionic conductivity because of the compensation by Zn doping. Hence, all-solid-state batteries with ZnO-doped electrolytes achieve higher initial Coulombic efficiency and a larger specific capacity than those of the ZnO-free electrolyte. ZnO-doped sulfide SEs are promising to develop all-solid-state Li-metal batteries.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Xiwei Zhang,Dan Hu,Zhenjie Tang,Dongwei Ma
Single ZnSe–ZnO nanowire axial p–n junction was fabricated by regioselectively oxidizing the p-type ZnSe NW in air. Pronounced current rectification behavior with on/off ratio of ∼50 and ideality factor of ∼1.7 were presented. The axial p–n junction also exhibited high sensitivity to UV light . A high performance UV light photodetector with a responsibility of ∼0.67 × 10 4 A W −1 , a gain of ∼2.3 × 10 4 and a detectivity of ∼4.1 × 10 13 cm Hz 1/2 W −1 were elucidated based on this axial p–n junction. This new method is expected to construct more nano-devices based on one-dimensional semiconductor nanostructures.
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高影响因子
危险品化学品经营许可证（带存储）