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An W.,Tsinghua University | Xu S.,Tsinghua University | Yang F.,Tsinghua University | Gao J.,Tianjin Institute of Power Source
IEEE Transactions on Antennas and Propagation | Year: 2014

A Ka-band reflectarray antenna integrated with solar cells has been designed, manufactured and tested. The electromagnetic characteristics of solar cells as antenna substrates have been studied and measured. The simulation and measurement results of a reflectarray antenna prototype show good radiation characteristics with measured gain of 26.3 dBi and 1-dB gain bandwidth of 8.75%, while having an optical blockage of 17.6% on solar energy. The proposed technique integrates the two largest components on a satellite platform-solar cells and high gain antennas into one, significantly reducing the volume, mass and cost of satellites. © 2014 IEEE.

Bao T.,Wuhan University | Zhong H.,Wuhan University | Zhong H.,Tianjin Institute of Power Source | Zhan H.,Wuhan University | Zhou Y.,Wuhan University
Electrochimica Acta | Year: 2015

Abstract Nano-FeF3/graphene composite is successfully fabricated by an in-situ method. The structure and morphology of the samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effect of different processing conditions and different carbon sources is investigated. The electrochemical performance of FeF3/graphene is examined by discharge/charge and electrochemical impedance measurements. The results show that the less than 5% graphene-containing composite exhibits high capacity, stable cycling, and outstanding rate capability. The ultrafine particle size and the homogeneous network between FeF3 and graphene both contribute to the excellent electrochemical property. © 2015 Elsevier Ltd.

Zhong H.,Hubei University | Zhong H.,Tianjin Institute of Power Source | Yang Y.,Hubei University | Ding F.,Tianjin Institute of Power Source | And 3 more authors.
Chemical Communications | Year: 2015

The Si-MnOOH composite electrode exhibits very stable cycling and excellent rate capability, such as 1200 mA h g-1 at 12 A g-1, and 700 mA h g-1 at 20 A g-1. The γ-MnOOH component significantly promotes the alloying/de-alloying reaction between Si and lithium. © The Royal Society of Chemistry 2015.

Li C.,Shanghai University | Han K.,Shanghai University | Li J.,Shanghai University | Zhang H.,Tianjin Institute of Power Source | And 5 more authors.
Organic Letters | Year: 2012

Three pillar[5]arene dimers, bridged by a flexible aliphatic chain (H1) or a relatively rigid phenylene unit (H2 and H3), were synthesized, with the possible synthetic strategies being discussed. The dimers could significantly enhance the binding affinities toward neutral model substrates in comparison with monomeric 1,4-dimethoxypillar[5]arene (H4) through the cooperative binding of two pillar[5]arene moieties. The molecular binding ability and selectivity are discussed from the viewpoints of the size/shape-fit concept and multiple recognition mechanism. © 2011 American Chemical Society.

Yang T.,Tianjin University | Liu X.,Tianjin University | Liu X.,Tianjin Institute of Power Source | Sang L.,Tianjin Institute of Power Source | Ding F.,Tianjin Institute of Power Source
Journal of Power Sources | Year: 2013

The discharge performance of the water-stable lithium electrode (WSLE) is improved by introducing the surface modification of the glass-ceramic plate (LAGP and LATP). The water-stable lithium electrodes are prepared with the NASICON-type glass-ceramic plates as protection layer, and using organic electrolyte as interlayer. The glass-ceramic plates with ionic conductivity of 4 × 10-4-5.7 × 10-4 S cm-1 are waterstable and 300-500 μm thick. The modified layer is deposited onto the glass-ceramic plates by RF magnetron sputtering from a Li4Ti5O12 target. The modified layer is analyzed by XRD, SEM-EDX, Raman and XPS. The Li-air test-cells are assembled with an SCE as reference electrode in aqueous solution. In the Li-air test-cells, the AC impedance and constant polarization potential measurements are carried out to identify the improvement of modification. The impedance of interface between the glass-ceramic plate and organic electrolyte decreases about 20-50%. Consequently, the discharge current is promoted about 70-80%. Then, by introducing interfacial modification of glass-ceramic plate, the power performance of WSLE is remarkably promoted. © 2013 Elsevier B.V. All rights reserved.

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