Yidong Zhang

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (31)47.75 Total impact

  • Hongxiao Zhao · Jing Li · Yidong Zhang · Huimin Jia · Liwei Mi · Zhi Zheng
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    ABSTRACT: This work presents copper nanoparticles as substituted electrocatalysts for oxidation of methanol. Copper nanoparticles were successfully synthesized by a simple electrochemical method and then were characterized by X-ray diffraction and scanning electron microscope. The electrocatalytic properties of the methanol oxidation at this material on the kryptol substrate was investigated at room temperature using cyclic voltammetry, electrochemical impedance spectroscopy and current density-time experiment. The results revealed that copper catalysts presented attractively electrocatalytic activity for methanol oxidation reaction (MOR). Owing to lower production costs of copper, the reported nanostructured copper catalyst is a promising electrode material for direct methanol fuel cells.
    No preview · Article · May 2014 · Asian Journal of Chemistry
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    ABSTRACT: In this paper, Pt-Co3O4 nanocomposite was synthesized by a sol-gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and current density-time curve. It is found that the resultant Pt-Co3O4 catalysts with minute amount of Pt exhibite attractive electrocatalytic activity for methanol oxidation reaction (MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co3O4. Together with the low manufacturing cost of Co3O4, the reported nanostructured Pt-Co3O4 catalyst is expected to be a promising electrode material for direct methanol fuel cells (DMFC).
    Preview · Article · Dec 2013
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    ABSTRACT: In this paper, Pt-Co3O4 nanocomposite was synthesized by a sol-gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and current density-time curve. It is found that the resultant Pt-Co3O4 catalysts with minute amount of Pt exhibite at tractive electrocatalytic activity for methanol oxidation reaction (MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co3O4. Together with the low manufacturing cost of Co3O4, the reported nanostructured Pt-Co3O4 catalyst is expected to be a promising electrode material for direct methanol fuel cells (DMFC).
    No preview · Article · Nov 2013 · Nano-Micro Letters
  • Huimin Jia · Weiwei He · Yidong Zhang · Yan Lei · Yong Xiang · Shu Zhang · Zhi Zheng
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    ABSTRACT: CdS nanostructured thin films have been directly fabricated on indium-tin oxide (ITO) glass substrates through a one-step solvothermal process involving a cadmium nanocrystal layer and sulfur powder in N,N-dimethyl formamide (DMF). Poly(3-hexylthiophene) (P3HT) was then infiltrated into the CdS framework. The CdS film and the CdS–P3HT hybrid film were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), photoluminescence spectroscopy (PL) and UV-vis spectroscopy. CdS–P3HT hybrid film exhibited a wider absorption in the solar spectrum and stronger photo-current response and external quantum efficiency than a pure CdS and P3HT film. Hybrid solar cell devices have been constructed based on the CdS–P3HT hybrid film with structure ITO–CdS–P3HT–Au. The effects of sulfur sources, solvent and thickness of elemental cadmium films on the photovoltaic performance of CdS–P3HT hybrid solar cells were assessed.
    No preview · Article · Sep 2013 · New Journal of Chemistry
  • Yidong Zhang · Weiwei He · Hongxiao Zhao · Pinjiang Li
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    ABSTRACT: In this paper, we described how WO3 microspheres have been synthesized by a simple hydrothermal treatment from the precursor of Na2WO4 and CO (NH2)2 at 160 °C for 3 h. The sample was characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), high resolution transmission electronic microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS). Obtained results indicated that the average diameter of the as-prepared WO3 microspheres is ∼1 μm with orthorhombic phase. The WO3 microspheres are constructed of polycrystalline WO3 nanoparticles. The thickness of the WO3 coating of the gas sensor is ∼2 μm. The WO3-based gas sensor exhibited a good sensitivity and high selectivity to acetone vapor at 200 °C. A possible mechanism for the acetone vapor gas sensing was proposed.
    No preview · Article · Sep 2013 · Vacuum
  • Yidong Zhang · Weiwei He · Huimin Jia
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    ABSTRACT: In this work, CuInS2 (CIS) particles were prepared by a simple hydrothermal method using the precursors of Cu(NO3)2, In(NO3)3 and CS(NH2)2 in aqueous solution at 160 °C for 2 h, followed by a spin coating process on the quartz substrate, so a CIS thin film was obtained. The CIS film was analyzed by means of a transmission electron microscope, an atomic force microscope, x-ray diffraction, energy dispersive spectroscopy, x-ray photoelectron spectroscopy and UV–visible absorption spectroscopy. The results show that the even and compact CIS thin film is composed of particles with a regular morphology and a uniform size distribution, with chalcopyrite structure. The crystalline quality of CIS film is significantly improved, growing along the (112) orientation. Its composition is close to the stoichiometric ratio (1:1:2) of the single CIS phase. Besides, the CIS thin film has an obvious absorption in the visible light region, and the band gap energy of the CIS film is approximately 1.40 eV. The method provides a potential new approach to fabricating CIS thin film applied in the field of solar cells.
    No preview · Article · Jun 2013 · Physica Scripta
  • Yidong Zhang · Pinjiang Li
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    ABSTRACT: Zinc oxide microrods was prepared without the addition of template and additive by a simple hydrothermal route only using Zn(CH3COO)2 · 2H2O as a precursor. A ZnO electrode was obtained by spreading the ZnO paste on the FTO glass substrate using a "doctor blade method" followed by a drying process in air at 80 °C for 1 h. Then the ZnO electrode was dye-sensitized with an organometallic dye for 24 h at room temperature. A dye-sensitized solar cell was assembled by dropping a drop of the liquid electrolyte on the dye-sensitized ZnO microrods film electrode. The Pt electrode was laid over. The crystal structure and elemental component were studied by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), electron diffraction (ED), and X-ray photoelectron spectroscopy (XPS), respectively. The morphology and the current–voltage (J–V) characteristics were investigated by scanning electron microscopy (SEM) and solar simulator with an AM 1.5G filter under an irradiation intensity of 100 mW cm–2. The light intensity was calibrated using a standard silicon photovoltaic solar cell. The DSSCs based on ZnO microrods showed a good photovoltaic performance. The paper firstly described a simple template-free method to fabricate ZnO microrods to assemble ZnO DSSC with good photovoltaic performance.
    No preview · Article · Jun 2013 · Journal of Advanced Microscopy Research
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    ABSTRACT: In this study, a three-dimensional (3D) nano/micropeony-like hierarchical Cu2 − xSe has been synthesized by a one-step solvothermal method with ethylenediamine and ethylene glycol as mixed solvents. The 3D copper foam was selected as sacrificial template, and the aqueous solution of mixture Na2SeO3 and Na2Se was chosen as a suitable selenium source for this reaction. Note that 3D Cu2 − xSe nano/micro architectures are rarely reported in previous studies. Meanwhile, the 3D template can provide a more stable environment and huge specific surface area, which lead to more stable and regular Cu2 − xSe grown in situ. Every nanoflake of the uniform Cu2 − xSe hierarchical structures is about 5 μm in diameter and 50 nm in thickness. These nanoflakes can be used as a Fenton-like catalyst for the degradation of Methylene Blue and Rhodamine B dye solution without any kind of light source and thus obtain good effect.
    No preview · Article · May 2013 · Thin Solid Films
  • Xinmin Wang · Chengqun Yu · Junxi Wu · Zhihua Wei · Yidong Zhang
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    ABSTRACT: In this work, a superhydrophobic ZnS film was successfully synthesized by a simple solvothermal route using Zn foil and sulphur powder as raw materials in an absolute ethanol solution at 160 °C for 24 h. The products were characterized by X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy and contact angle. Results show that the obtained films werehigh crystallinity and uniformity. A possible reaction mechanism was proposed and discussed. It is found that the ZnS film exhibits superhydrophobicity due to its special nanoflakes structure. The average thickness of the ZnS nanoflakes film is ca. 120 nm.
    No preview · Article · Feb 2013 · Asian Journal of Chemistry
  • Yidong Zhang · Baojun Huang · Pinjiang Li · Xinmin Wang · Yange Zhang
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    ABSTRACT: CuS–ZnO nanocomposite films were prepared by a simple sol–gel process. The microstructure, morphology, and tribological properties of the prepared films were investigated via X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscopy (SEM), and by an UMT-2 tribometer. Results show that the films are uniform and compact with hexagonal ZnO phase. The films display excellent wear resistance and friction-reduction performance. Particularly, the molar ratio of 5% CuS of sample “c” obtains the best result. Frictional trace observation suggests that the wear mechanism of the film has slight scuffing, adhesion, and abrasion.
    No preview · Article · Feb 2013 · Tribology International
  • Yidong Zhang · Pinjiang Li · Baojun Huang · Qingyu Li · Zhi Zheng
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    ABSTRACT: In this work, ZnO coatings were fabricated by the RF-sputtering method on quartz substrates in an inert gas ambient of Ar followed by a thermal oxidation process in air at different temperatures. The effect of thermal oxidation temperatures on the structures and photoluminescence (PL) properties of the coatings were studied. The structural characteristics of the samples were analyzed by X-ray diffraction (XRD) and atomic force microscope (AFM). The PL spectra were obtained by using a Xe laser as a light source with an excitation wavelength of 325 nm at room temperature. The force-curves were obtained by AFM. The results show that all the prepared ZnO coatings have a compact hexagonal wurtzite structure. With the increasing annealing temperature from 400 °C to 600 °C, the particle size, surface RMS roughness, photoluminescence intensity and adhesion force of the prepared ZnO coatings were increased as well.
    No preview · Article · Oct 2012 · Optics Communications
  • Yidong Zhang · Liwei Mi
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    ABSTRACT: A superhydrophobic ZnS film was successfully fabricated by a simple solvothermal method using Zn foil and S powder as raw materials in an absolute ethanol solution at 160 degrees C for 8 h. The products were characterized by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and contact angle (CA) measurements. The results show that the obtained ZnS film was hexagonal phase, composed of many dense and uniform interconnected nanoflakes of average thickness ca. 120 nm. A possible reaction mechanism was proposed and discussed. It was found that the ZnS film exhibits superhydrophobicity owing to its special nanoflake structure.
    No preview · Article · Sep 2012 · Chemistry Letters
  • Yidong Zhang · Liwei Mi · Qingyu Li · Zhi Zheng
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    ABSTRACT: In the work, the ZnO films were fabricated using the glucose-assisted sol–gel method under different precursor concentrations. The ZnO films were composed of many ZnO nanoparticles with polycrystalline hexagonal wurtzite structure. Its frictional, adhesive properties and interface contact types between the atomic force microscope tip and the samples were investigated based on Amonton's laws and the general Carpick's transition equation, respectively. The results showed that the tip–sample contacts corresponded to the Johnson–Kendall–Robert/Derjaguin–Muller–Toporov (DMT) transistion model for ZnO films. Frictional forces for the four samples were linearly dependent on external loads and adhesive forces at higher loads and lower loads, respectively. Frictional tests showed that sample “b” exhibited the highest nano-frictional coefficient due to the highest capillary force formed on the ZnO surface. The ZnO sol–gel film might be promising for applications in the lubrication of nano/micro electromechanical systems.
    No preview · Article · Jul 2012 · Wear
  • Yidong Zhang · Liwei Mi · Zhi Zheng
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    ABSTRACT: Zn1−xCuxO thin films (x=0, 1.0, 3.0, 5.0%) are prepared on quartz substrate by sol–gel method. The structure and morphology of the samples are investigated by X-ray diffraction (XRD) and atomic force microscopy (AFM). The results show that Cu ions were effectively penetrated into the ZnO crystal lattices with substitutional and interstitial impurities to form stable solid solutions without changing the polycrystalline wurtzite structure. Two peaks at 420 nm (2.95 eV, violet), 485 nm (2.56 eV, blue) have been observed from the photoluminescence (PL) spectra of the samples. It is concluded that the violet peak may correspond to the exciton emission; the blue emission corresponds to the electron transition from the bottom of the conduction band to the acceptor level of zinc vacancy. The optical test shows that the optical band gap Eg is decreased with the increase amount of Cu doping in ZnO. The band gap decrease from 3.40 eV to 3.25 eV gradually. It is also found that the transmission rate is increased rapidly with the increase of Cu ions concentration.
    No preview · Article · Jun 2012 · Physica B Condensed Matter
  • Xinmin Wang · Chengqun Yu · Junxi Wu · Yidong Zhang
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    ABSTRACT: Ag-doped WO3 nanowhiskers have been successfully synthesized by a simple sol-gel treatment from the precursors W, H2O2, and AgNO3 at room temperature, followed by heat treatment at 400 degrees C for 1 h. The samples were characterized by X-ray diffraction (XRD), energy-dispersive spectrum (EDS), and scanning electron microscopy (SEM). Obtained results show that the obtained nanowhiskers width is ca. 200 nm with orthorhombic phase under different Ag-doped concentrations. Compared with the pure WO3-based sensor, all of the Ag-doped sensors showed better sensing performance in respect of sensitivity and selectivity. The sensor containing 3.0 mol % Ag exhibited the maximum sensitivity to formaldehyde vapor at 150 degrees C. A possible mechanism for the influence of Ag on the formaldehyde-sensing properties of Ag-doped WO3 sensors is proposed.
    No preview · Article · Jun 2012 · Chemistry Letters
  • Yidong Zhang · Qingyu Li
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    ABSTRACT: Zinc oxide microrods (MRs) were successfully prepared without the addition of template and additive by a simple hydrothermal route using only Zn(CH3COO)2·2H2O as a precursor at 160 °C for 3 h. Interestingly, the ZnO MRs can be transformed to ZnS microspheres (MSs) with the sulfur source of thiourea under the same conditions. The products were characterized by X-ray diffraction (XRD), energy-dispersive spectrum (EDS), and scanning electron microscopy (SEM). Results show that the obtained ZnO MRs and ZnS MSs belonged to hexagonal phase and cubic phase, respectively. A possible reaction mechanism is proposed and discussed.
    No preview · Article · May 2012 · Chemistry Letters
  • Xinmin Wang · Chengqun Yu · Junxi Wu · Yidong Zhang
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    ABSTRACT: Zinc oxide microrods with controlled diameter were prepared without the addition of template and additive by a simple hydrothermal route only using Zn(CH3COO)2·2H2O as a precursor. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electron diffraction (ED). The crystal structure of prepared ZnO microrods is hexagonal phase polycrystalline with zincite structure. With the increase of the precursor concentration from 0.05 M to 0.6 M, the diameter of the ZnO microrods increased from 1 μm to 5 μm. A localized oriented attachment mechanism was prepared to account for the formation of ZnO microrods. The gas-sensing performance experiments indicated that the prepared ZnO microrods exhibited highly sensitive, selective gas-sensing properties, and good stability to acetone vapor. The response and recovery time of ZnO-based gas sensor to 100 ppm acetone vapor are 12 s and 18 s, respectively. The mechanism of the ZnO-based sensor was investigated.
    No preview · Article · Feb 2012 · Ionics
  • Yidong Zhang · Weiwei He
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    ABSTRACT: Purpose – The purpose of this paper is to demonstrate the I-V characteristics of ZnO film on Si substrates with Ag buffer layer by conductive atomic force (C-AFM). Design/methodology/approach – An Ag buffer layer and Zn film was first deposited on silicon substrate by RF-sputtering deposition method from high pure Ag and Zn target, respectively. Then, the deposited film was sintered in air at 500°C for 1?h. Findings – The structures and morphologies of the prepared films were characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), atomic force microscopy (AFM), and C-AFM. The results show that the prepared ZnO films with Ag buffer layer have a good crystallinity and surface morphology. Interestingly, the I-V curve of ZnO film exhibited typical characteristics of semi-conductive oxide under the conductive Ag buffer layer. Originality/value – The paper demonstrates, by C-AFM, that the ZnO/Ag-buffer/Si exhibits excellent crystal structure, morphology and typical I-V characteristics.
    No preview · Article · Jan 2012 · Microelectronics International
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    ABSTRACT: Tungsten trioxide (WO3) films with novel dandelion-like structures were prepared by spin-coating a sol of WO3 with CTAB (cetyltrimethyl ammonium bromides) on quartz substrates. The resultant WO3 films were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The wettabilities of the WO3 films were evaluated by contact angle (CA) measurements. It was found that the WO3 film exhibited superhydrophilicity under UV light irradiation, whereas after storage in the dark for a certain time, it turned to be superhydrophobic.
    No preview · Article · Jan 2012 · Zeitschrift für anorganische Chemie
  • Yidong Zhang · Guofu Sun · Hongxiao Zhao · Jing Li · Zhi Zheng
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    ABSTRACT: In this work, we demonstrate the influence of an Au buffer layer on the structure and photoluminescence (PL) properties of ZnO sol–gel thin films on Si substrates. An Au layer was deposited on the silicon substrate by the evaporation deposition method from highly pure Au (99.99%) wires. Then, a ZnO film was prepared by the sol–gel method with spin-coating technology, followed by calcinations in air at 600 °C for 1 h. The structures and morphologies of the prepared films were characterized by x-ray diffraction, energy dispersive spectrum analysis, atomic force microscopy and PL. The results show that the prepared ZnO thin film with an Au buffer layer exhibits good crystallinity and surface morphology compared with that without an Au buffer layer. Interestingly, different from other previous reports on buffer layers with PL-enhanced properties, the ZnO thin film with Au buffer layer showed an obvious violet PL-quenched property.
    No preview · Article · Sep 2011 · Physica Scripta

Publication Stats

217 Citations
47.75 Total Impact Points

Institutions

  • 2012-2013
    • Chinese Academy of Sciences
      • Key Laboratory of Ecosystem Network Observation and Modeling
      Peping, Beijing, China
  • 2010-2013
    • Xuchang University
      Syuychan, Henan Sheng, China