Min Liu

Lanzhou University of Technology, Kao-lan-hsien, Gansu Sheng, China

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Publications (6)12.1 Total impact

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    ABSTRACT: A new porous cobalt hydroxide film has been successfully electrodeposited on nickel foam from 0.1M cobalt nitrate electrolyte at −1.0V vs. SCE without adding any surfactant. The microstructure and surface morphology of prepared cobalt hydroxide films were physically characterized by X-ray diffraction analysis and scanning electron microscopy. The results indicate that an interlaced network structure was obtained. The effects of electrodeposition time, deposition potential, and different substrates on the specific capacitance and microstructure of prepared porous α-Co(OH)2 thin film were systematically studied. The results indicate that the film deposited on nickel foam at −1.0V has excellent electrochemical properties. A maximum specific capacitance of 1473Fg−1 could be achieved at a current density of 2Ag−1. KeywordsElectrochemical capacitors–Cobalt hydroxide–Electrodeposition–Porous structure
    Journal of Solid State Electrochemistry 01/2011; 15(3):571-577. · 2.28 Impact Factor
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    ABSTRACT: In this work, oxide nanoflakes with a maximum specific capacitance of are successfully synthesized by a facile chemical coprecipitation method. To enhance energy density, an asymmetric supercapacitor with high energy and power density has been constructed with oxide nanoflakes as the positive electrode and activated carbon as the negative electrode. The performance of the asymmetric supercapacitor was characterized by cyclic voltammetry and chronopotentiometry technology. By using the nanoflakes oxides electrode, the asymmetric supercapacitor exhibits high energy density and stable power characteristics; the maximum specific capacitance of and specific energy of are demonstrated for a cell voltage between 0 and .
    Journal of The Electrochemical Society. 11/2010; 157(12):A1341-A1346.
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    ABSTRACT: In this work, stabilized Al-substituted α-Ni(OH)2 materials were successfully synthesized by a chemical coprecipitation method. The experimental results showed that the 7.5% Al-substituted α-Ni(OH)2 materials exhibited high specific capacitance (2.08 × 103F/g) and excellent rate capability due to the high stability of Al-substituted α-Ni(OH)2 structures in alkaline media, suggesting its potential application in electrode material for supercapacitors. To enhance energy density, an asymmetric type pseudo/electric double-layer capacitor was considered where α-Ni(OH)2 materials and activated carbon act as the positive and negative electrodes, respectively. Values for the maximum specific capacitance of 127F/g and specific energy of 42W·h/kg were demonstrated for a cell voltage between 0.4 and 1.6V. By using the α-Ni(OH)2 electrode, the asymmetric supercapacitor exhibited high energy density and stable power characteristics. The hybrid supercapacitor also exhibited a good electrochemical stability with 82% of the initial capacitance over consecutive 1,000 cycle numbers. KeywordsAsymmetric supercapacitors-Alpha-nickel hydroxide-Specific capacitance-Specific energy
    Journal of Solid State Electrochemistry 01/2010; 14(8):1533-1539. · 2.28 Impact Factor
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    ABSTRACT: Cobalt hydroxide nanoflakes with a maximum specific capacitance of 735 F/g are successfully synthesized by a facile chemical precipitation method. To enhance energy density, an asymmetric-type pseudo/electric double-layer capacitor is considered where nanoflakes and activated carbon act as the positive and negative electrodes, respectively. The electrochemical properties of the two electrodes and the asymmetric supercapacitor are investigated in 2 M KOH aqueous electrolyte. Values for the maximum specific capacitance of 72.4 F/g and specific energy of are demonstrated for a cell voltage between 0 and 1.6 V. By using the nanoflake electrode, the asymmetric supercapacitor exhibits high energy density and stable power characteristics. The hybrid supercapacitor also exhibited a good electrochemical stability with 93.2% of the initial capacitance over consecutive 1000 cycle numbers.
    Journal of The Electrochemical Society. 11/2009; 156(12):A1000-A1004.
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    ABSTRACT: Cobalt hydroxide nano-flakes are successfully synthesized by a facile chemical precipitation method. Electrochemical characterization is performed using cyclic voltammetry, chronopotentiometry and impedance spectroscopy, respectively. These cobalt hydroxide nano-flakes maintain high utilization at high rates of discharge. A maximum specific capacitance of 735Fg−1 can be achieved in 2M aqueous KOH with the potential range from −0.2 to 0.4V (vs. SCE) in a half-cell setup configuration for the nano-flakes Co(OH)2 electrode, suggesting its potential application in electrochemical capacitors. Furthermore, the effect of annealing temperatures on the electrochemical capacitance characteristics is also been systematically explored.
    Journal of Power Sources 01/2009; 194(2):1194-1201. · 5.26 Impact Factor
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    ABSTRACT: Loose-packed nickel hydroxides were successfully synthesized by a facile chemical precipitation method. Structure characterizations indicate that a nanoflake structure with low crystallinity for the nickel hydroxide samples was obtained. Electrochemical studies were carried out using cyclic voltammetry, chronopotentiometry technology, and alternating current impedance spectroscopy, respectively. A maximum specific capacitance of 2,055F/g could be achieved in 2M aqueous KOH with the potential range of 0 to 0.4V (vs. the saturated calomel electrode) in a half-cell setup configuration for the nanoflake Ni(OH)2 electrode, suggesting its potential application in the electrode material for electrochemical capacitors. Furthermore, the effect of annealing temperatures on the electrochemical capacitance characteristics has also been systemically explored.
    Journal of Solid State Electrochemistry 01/2009; 13(2):333-340. · 2.28 Impact Factor