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Dive into the research topics where Zhuoyuan Chen is active.

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Featured researches published by Zhuoyuan Chen.


ACS Applied Materials & Interfaces | 2013

Highly efficient photocatalytic performance of graphene-ZnO quasi-shell-core composite material.

Yuyu Bu; Zhuoyuan Chen; Weibing Li; Baorong Hou

In the present paper, the graphene-ZnO composite with quasi-shell-core structure was successfully prepared using a one-step wet chemical method. The photocatalytic Rhodamine B degradation property and the photoelectrochemical performance of the graphene-ZnO quasi-shell-core composite are dependent on the amount of graphene oxide that is added. When the amount of graphene oxide added is 10 mg, the graphene-ZnO quasi-shell-core composite possesses the optimal photocatalytic degradation efficiency and the best photoelectrochemical performance. An efficient interfacial electric field is established on the interface between the graphene and ZnO, which significantly improves the separation efficiency of the photogenerated electron-hole pairs and thus dramatically increases its photoelectrochemical performance. In addition to the excellent photocatalytic and photoelectrochemical properties, the electron migration ability of the grephene-ZnO quasi-shell-core composite is significantly enhanced due to the graphene coating on ZnO surface; therefore, this material has great potential for application as a substrate material to accept electrons in dye solar cell and in narrow bandgap semiconductor quantum dot sensitized solar cells.


ACS Applied Materials & Interfaces | 2013

High-efficiency photoelectrochemical properties by a highly crystalline CdS-sensitized ZnO nanorod array.

Yuyu Bu; Zhuoyuan Chen; Weibing Li; Jianqiang Yu

A ZnO nanorod array with comparatively long nanorods was successfully prepared on a Ti substrate by applying a hydrothermal method twice. CdS nanoparticles with high crystallinity were deposited onto the surface of ZnO nanorods through a galvanostatic electrodeposition method. CdS-sensitized ZnO nanorod arrays after being hydrothermally grown twice with the second growth time of 6 h possessed the best photoelectrochemical performance. The photoinduced current densities at a 0 V bias potential are 23.7 and 15.8 mA·cm(-2) under the illumination of simulated sunlight and visible light, respectively. The monochromatic incident photon-to-electron conversion efficiency values at the wavelength of 380-520 nm are in the range of 50-60%, which indicated its high photoelectric conversion efficiency. The contribution from visible light is significantly higher than that from UV light. The prepared photoanodes in the present work exhibit a potential application in photoelectrochemical hydrogen production from water reduction under sunlight.


RSC Advances | 2014

Study of the promotion mechanism of the photocatalytic performance and stability of the Ag@AgCl/g-C3N4 composite under visible light

Yuyu Bu; Zhuoyuan Chen; Chang Feng; Weibing Li

The Ag@AgCl/g-C3N4 composite was prepared by in situ fabricating Ag@AgCl on the surface of g-C3N4 using deposition–precipitation and subsequently photo-assisted reduction. Both the photocatalytic degradation performance and the photocatalytic degradation stability of the Ag@AgCl/g-C3N4 composite are significantly improved compared to g-C3N4 and Ag@AgCl composite. The Ag@AgCl/g-C3N4 composite can completely degrade RhB in 20 min under the illumination of visible light (λ > 420 nm). The Ag@AgCl/g-C3N4 composite can increase the light absorption intensity in the visible light region due to the surface plasmon resonance effect of Ag, resulting in a significant increase of the yields of the photogenerated electrons and holes. An effective heterojunction electric field was formed on the interface between g-C3N4 and Ag@AgCl, which significantly strengthened the separation efficiency of the photogenerated electrons and holes, leading to a significant promotion of the photocatalytic degradation performance.


Applied Physics Letters | 2000

Thickness-independent electron field emission from tetrahedral amorphous carbon films

J. P. Zhao; Zhuoyuan Chen; X. Wang; Tongfei Shi; T. Yano

Electron field emission properties of tetrahedral amorphous carbon films of different thicknesses have been studied. The experimental results indicate that there exists no close relationship between threshold electric field and film thickness. Different field emission models are used to examine the experimental results in order to explain the thickness-independent electron field emission properties.


RSC Advances | 2014

Highly efficient photoelectrochemical anticorrosion performance of C3N4@ZnO composite with quasi-shell–core structure on 304 stainless steel

Yuyu Bu; Zhuoyuan Chen

Carbon nitride@zinc oxide (C3N4@ZnO) composite with a quasi-shell-core structure was prepared in this work. The coating of C3N4 on ZnO significantly increases the photoelectrochemical anticorrosion performance of ZnO. When the amount of C3N4 added is 1 wt%, the C3N4@ZnO composite can provide the best photoelectrochemical anticorrosion capability for 304 stainless steel. This improved performance is attributed to the formation of an effective heterojunction electric field on the interface between C3N4 and ZnO, which improves the separation efficiency of the photogenerated electron-hole pairs, increases the lifetime of the photoinduced electrons, and enhances the photoelectrochemical anticorrosion performance of ZnO.


Applied Physics Letters | 2014

Role of wrinkles in the corrosion of graphene domain-coated Cu surfaces

Yaqian Zhang; Huamin Zhang; Baoyi Wang; Zhuoyuan Chen; Yong Zhang; Yanping Sui; B. Zhu; C. M. Tang; X. L. li; G. H. Yu; Zhi Jin; Xiaohui Liu

We analyzed the protective ability of chemical vapor deposition (CVD) graphene domains against corrosion of Cu surfaces. Fresh graphene domains of various shapes were ideal corrosion-inhibiting layers. However, obvious corrosion was found within graphene domains exposed to the air for over a week. Our work demonstrates that the opportunities for corrosion of CVD graphene were provided by wrinkles but not others, such as Cu grain boundaries and graphene domain boundaries, which are always believed the primary factor for inferior quality of the CVD graphene at present.


Journal of Applied Physics | 1998

DETERMINATION OF THE SP3/SP2 RATIO IN TETRAHEDRAL AMORPHOUS CARBON FILMS BY EFFECTIVE MEDIUM APPROXIMATION

Zhuoyuan Chen; Y.H. Yu; J. P. Zhao; X. Wang; X.H. Liu; Tiemao Shi

In this article, a method for the determination of the sp3/sp2 ratio for highly tetrahedral amorphous carbon (ta-C) films is presented. This method is an optical characterization according to the Bruggeman effective medium approximation based on simulation of the infrared reflection spectrum. The simulation reflectivity is in good agreement with the experimental spectrum, and the obtained results of sp3 content are in good agreement with electron energy loss spectroscopy data, suggesting that this is an effective method for obtaining the sp3/sp2 ratio of ta-C films.


RSC Advances | 2013

Dramatically enhanced photocatalytic properties of Ag-modified graphene-ZnO quasi-shell-core heterojunction composite material

Yuyu Bu; Zhuoyuan Chen; Weibing Li

Preparation of semiconductor heterojunction composites with special nanostructure is an effective way to enhance the photoelectric conversion efficiency of photocatalysts. In this work, the graphene–ZnO composite with quasi-shell–core structure was successfully prepared using a one-step wet chemical method. Silver nanoparticles are loaded onto the graphene–ZnO quasi-shell–core composite by photo-assisted reduction. Ag modification significantly improved the photocatalytic rhodamine B degradation capability of the graphene–ZnO quasi-shell–core composite and all of the rhodamine B dye was degraded by it only after 10 min of white light illumination. The graphene–ZnO composite with quasi-shell–core structure could effectively improve the separation efficiency of the electrons and holes photoinduced by the ZnO. Ag modification could accelerate the reduction processes of the photogenerated electrons and avoid the accumulation of electrons on graphene, resulting in the promotion of the photocatalytic performance of this composite.


RSC Advances | 2015

Enhanced photoelectrochemical performance of the hierarchical micro/nano-structured TiO2 mesoporous spheres with oxygen vacancies via hydrogenation

Xiaoying Zhang; Zhuoyuan Chen

Hierarchical micro/nano-structured TiO2 mesoporous spheres with oxygen vacancies have been fabricated via a template-free strategy followed by hydrogenation and their photocatalytic performance has been explored. The hierarchical micro/nano-structured mesoporous spheres can act as a model architecture for efficient photoelectrochemical devices because they can simultaneously offer abundant catalytically active sites, excellent light-scattering characteristics and a highly conductive pathway for charge carriers collection. More importantly, oxygen vacancies are introduced onto the surface of TiO2 and function as shallow donors. The presence of oxygen vacancies not only boosts the light absorption but also improves the electrical conductivities of TiO2, thus enhancing the optical response and electron–hole separation. As a result, hierarchical micro/nano-structured TiO2 mesoporous spheres with oxygen vacancies exhibit a remarkably enhanced photoelectrochemical performance.


Thin Solid Films | 1998

Field emission from amorphous diamond films prepared by filtered arc deposition

X. Wang; J. P. Zhao; Zhuoyuan Chen; S.Q. Yang; Tiemao Shi; X.H. Liu

Nonhydrogenated amorphous carbon films have been prepared by filtered arc deposition (FAD), which provides carbon ions with optimum kinetic energies at practical deposition rates. It was found that the carbon atoms were so highly tetrahedrally bonded that the films were referred to as amorphous diamond (α-D). The field emission behaviour of the α-D films has been studied for the first time. The field emission current more that 10 μA was detected at an electric field intensity of 18 V/μm. Such a low threshold field provides the designer of flat panel displays with an opportunity to develop a planar emitter, rather than the conventional Spindt-tip field emitter which requires lithographic and microstructural burdens.

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Yuyu Bu

Chinese Academy of Sciences

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Weibing Li

Qingdao University of Science and Technology

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X. Wang

Chinese Academy of Sciences

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J. P. Zhao

Chinese Academy of Sciences

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X.H. Liu

Chinese Academy of Sciences

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Tiemao Shi

Chinese Academy of Sciences

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Tongfei Shi

Chinese Academy of Sciences

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Yaqian Zhang

Chinese Academy of Sciences

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