Beijing Aerospace Wanfang Technology Co.

Fengtai, China

Beijing Aerospace Wanfang Technology Co.

Fengtai, China
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Wu F.,Huzhou Teachers College | Zhang H.,Beijing Aerospace Wanfang Technology Co. | Lu W.,Huzhou Teachers College | Li X.,Huzhou Teachers College
Journal of Composite Materials | Year: 2015

CuO nanoparticles (NPs) sensitized ZnO nanorod composite coaxial nanoarrays were successfully prepared by a combined hydrothermal-solvothermal method. Scanning electron microscopy images show that the number of CuO-NPs on ZnO nanorod surface can be controlled by the reaction time. Synthesis mechanism of ZnO/CuO nanoarray was studied in this work. The Cu2+ ions in solution would be captured by Zn vacancy on ZnO nanorod surface, and then combined with hydroxy groups in solution to formation Cu(OH)2, providing the initial nucleation for surface growth of CuO-NPs. Moreover, the optical absorption properties of ZnO/CuO nanoarray and energy band analysis suggest that CuO can both serve as the supplementary absorption material and electron acceptor for conjugate polymer in polymer-inorganic hybrid solar cells, or might become the light-harvesting material in dye-sensitized solar cells. © 2014 SAGE Publications.

Wu F.,Huzhou Teachers College | Chen C.,Henan University | Zhao Y.,Ningbo Institute of Materials Technology and Engineering | Zhang H.,Beijing Aerospace Wanfang Technology Co. | And 3 more authors.
Journal of the Electrochemical Society | Year: 2014

Polymer-inorganic hybrid solar cells with pure vertically aligned TiO 2 nanorod arrays (TiO2-NRA) normally suffer from a rather low (<0.4 V) open-circuit voltage (Voc). Recently, it has been demonstrated that the Voc in polymer/TiO2-NRA solar cells can be improved to 0.7 V by formation of homostructured core-shell structures with single-crystalline TiO2 nanorod as core and the polycrystalline TiO2 quantum dots aggregation layer as shell. However, the V oc was not achieved high enough, and effects of different crystallinity of shell on device performance have not been investigated. In this paper, we obtained three types of homostructured TiO2 core-shell nanoarrays with different crystallinity of TiO2 shell (amorphous, amorphous&crystalline, and polycrystalline) through controlling shell reaction time. The changes of device performance (in particular, the V oc) in solar cells with these arrays are studied. Results show that the device Voc gradually decreases when crystallinity of shell changes from amorphous to crystalline. Moreover, the reason for a larger Voc by amorphous shell is analyzed. More dipoles could be produced at α-TiO x shell/polymer interface than crystalline TiO2 shell/polymer interface, which results in a further up-shifting conduction band edge in TiO2 nanorod core toward the local vacuum level of the polymer, along with a further enhanced Voc. © 2014 The Electrochemical Society. All rights reserved.

LU Z.,China Electric Power Research Institute | Liang Y.,China Electric Power Research Institute | Zeng Z.,Zhejiang University | Yang L.,China University of Mining and Technology | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

Fast charger is a key grid-interface component for the electric vehicle application. In this paper, a utility-friendly solution for the fast charger of electric vehicle application was presented based on the virtual synchronous motor (VSM) control scheme. In the proposed solution, the converter for the fast charger involves an AC/DC stage and a DC/DC stage. The AC/DC stage is an active rectifier integrated VSM control scheme to ensure the DC-link 600V and some advanced features. Then, the converter in DC/DC stage can buck the DC 600 V voltage to DC 48 V and feed the electric vehicle loads. Thanks to the presented solution, some advanced features and benefits can be confirmed. On one hand, the employed VSM control scheme in the AC/DC converter can guarantee the low total harmonic distortion of grid-tied current and support the utility with necessary inertia and damping in abnormal utility voltage and line-frequency conditions. On the other hand, the isolated DC/DC converter is also well controlled to perform fast and constant power charging of electric vehicle loads. The detailed control strategies of the solution were proposed, and their feasibilities and validations were verified by the simulated results using PSCAD/EMTDC and the experimental results on a 50 kW prototype. © 2014 Chinese Society for Electrical Engineering.

Wu F.,Huzhou University | Zhang H.,Beijing Aerospace Wanfang Technology Co. | Tong Y.,Huzhou University | Li X.,Huzhou University
Journal of Optics (United Kingdom) | Year: 2015

In this work, we developed a general and feasible method to improve both V oc and J sc in polymer/ZnO nanrod array (ZnO-NRA) hybrid solar cells (HSCs) through modification of the heterojunction interface by using a combination of inorganic and organic methods. First, homogeneous ZnO core/shell array (CSA), in which ZnO nanorods in array served as the core and ZnO quantum dot (QD) films acted as shells, was synthesized by inorganic modification. Next, the ZnO-CSA was modified with organic molecules (Z907) on QD shell surfaces by a solvothermal method. After co-modification of the polymer/ZnO-NRA heterojunction interfaces by the QD shells and organic molecules, the device efficiency improved by 4.8 times compared with that of pristine ZnO-NRA based solar cells. Our results indicate that a higher efficiency of HSCs can be realized by inorganic and organic co-modification of their heterojunction interfaces. © 2015 IOP Publishing Ltd.

Wu F.,Huzhou University | Zhao Y.,Ningbo Institute of Materials Technology and Engineering | Zhang H.,Beijing Aerospace Wanfang Technology Co. | Tong Y.,Huzhou University
Applied Physics A: Materials Science and Processing | Year: 2015

Hybrid solar cells (HSCs) based on pristine ZnO nanorod array (ZnO-NRA) and conjugated polymer with ordinary inverted device architecture normally perform low open-circuit voltage (Voc) and short-circuit current density (Jsc). This paper compares three improved device architectures for preparation of efficient polymer/ZnO-NRA HSCs by incorporating ZnO quantum dots (ZnO-QDs) into device with different engineering. It is found that when growth of ZnO-QDs on ZnO nanorod surface to formation of homostructured ZnO core–shell array (ZnO-CSA) instead of pristine ZnO-NRA can significantly increase the device Voc, while blending ZnO-QDs into MEH-PPV between nanorods can significantly increase the device Jsc. The best photovoltaic performance is realized in the architecture consisting of ZnO-CSA as well as blends of MEH-PPV and ZnO-QDs, in which the Voc and Jsc can be significant enhanced simultaneously. The present study reports the architecture-related device performances in polymer/ZnO-NRA solar cells, which will help to guide the design of HSCs or related optoelectronic devices. © 2015, Springer-Verlag Berlin Heidelberg.

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