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Li D.,Shandong University | Li D.,Beijing University of Chemical Technology | Meng F.,Tianjin Lishen Battery Joint Stock Co. | Wang H.,Enviromental Protection Administration of Linyi | And 2 more authors.
Electrochimica Acta | Year: 2016

Highly active nanoporous AuPt (np-AuPt) alloys with Pt/Au molar ratio ranging from 0.5:99.5 to 5:95 were successfully synthesized based on dealloying strategy. The synthesized np-AuPt alloys consisted of three-dimensional bicontinuous ligament-pore structure (∼10 nm) and microchannels. The electrochemical activity and stability of the np-AuPt alloys for formic acid electro-oxidation was investigated by tuning the Pt/Au molar ratio. Especially, a mass activity of the np-AuPt alloy that was 113 times higher than that of commercial JM-Pt/C catalyst was achieved at a Pt/Au molar ratio of 0.5:99.5. The low Pt/Au molar ratio made the surface Pt atoms be effectively isolated by the neighboring Au atoms, leading to the sole direct dehydrogenation pathway of the formic acid electro-oxidation on the np-AuPt alloys. © 2016 Elsevier Ltd. All rights reserved.

Bai Y.,Beijing Institute of Technology | Wu F.,Beijing Institute of Technology | Yang H.-T.,Tianjin Lishen Battery Joint Stock Co. | Zhong Y.,Patent Examination Cooperation Center | Wu C.,Beijing Institute of Technology
Advanced Materials Research | Year: 2012

Spinel LiMn 2O 4 was modified with Y 2O 3 coating by a chemical process. The crystal structures of the as-prepared samples were investigated by X-ray diffraction (XRD). The charge/discharge characteristics of the modified samples were evaluated at different rates between 3.0 and 4.4V. The discharge capacities of 2.0 wt.% Y 2O 3-coated LiMn 2O 4 are 116 mAh·g -1, 99.7mAh·g -1, 93.3mAh·g -1 and 82.9mAh·g -1 at 0.1C, 0.5C, 1C and 2C rates (at 20°C). The cycle abilities improvement of the spinel LiMn 2O 4 coated with Y 2O 3 are demonstrated at elevated temperature (55°C) and high rates (2C). From the analysis of electrochemical impedance spectroscopy (EIS), the improvement of cycle ability may be attributed to the suppression on the formation of the passivating films and the reduction of Mn dissolution, which result from the surface modification with Y 2O 3.

Zhou J.,Tianjin Lishen Battery Joint Stock Co.
33rd Annual International Battery Seminar and Exhibit: Advanced Battery Technologies for Consumer, Automotive and Military Applications | Year: 2016

Lishen has clear targets and product roadmaps for CE and xEV batteries. Lishen has showed progresses in both CE and xEV batteries and technologies.Lishen is becoming a reputational global mobile energy solution provider.

Quiroga-Gonzalez E.,University of Kiel | Bensch W.,University of Kiel | Aceves-Mijares M.,National Institute of Astrophysics, Optics and Electronics | Yu Z.,Tianjin Lishen Battery Joint Stock Co. | And 2 more authors.
Thin Solid Films | Year: 2011

The photoluminescence emission of multilayer structures composed of layers of silicon rich oxide with high silicon content and layers of silicon rich oxide with low silicon content obtained by low pressure chemical vapor deposition is here presented. Different parameters for the preparation of the multilayers have been varied such as the Si concentration and the thicknesses of the layers. Additionally, the samples were oxidized at different temperatures. For all samples the photoluminescence seems to have the same origin: defects in the oxide matrix and defects at the interfaces between the Si nanocrystals. The structural and compositional properties of the multilayer structures are discussed. © 2011 Elsevier B.V. All rights reseved.

Luo Y.,Tianjin Polytechnic University | Li Q.,Tianjin Lishen Battery Joint Stock Co. | Song S.,Tianjin University
Anti-Corrosion Methods and Materials | Year: 2014

Purpose: The purpose of this investigation was to study the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in seawater (flow velocity from 0 to 0.8 m/s, sediment content from 0 to 0.15 percent), to analyze the effects of the flow velocity and sediment content on the erosion-corrosion process. Design/methodology/approach: A simulated erosion-corrosion test system was set up. Weight loss determinations and electrochemical measurements (such as potentiostat square wave (PSW), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests) were used to study the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in stagnant and flowing seawater with different sediment contents. Findings: Under the test conditions, ZHMn55-3-1 copper alloys had good corrosion resistance to stagnant clear seawater, while increasing the flow velocity and sediment content reduced the corrosion resistance of the material. The difference in the erosion-corrosion mechanism between flow velocity and sediment content was that the former affected both the cathode process and the anode process of electrochemical corrosion, while the latter essentially affected only the anode process. Originality/value: This paper explains the effects of flow velocity and sediment content on the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in flowing seawater. © Emerald Group Publishing Limited.

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