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Electrochemical Fabrication of Porous Nanostructured Nickel-Based Complex Film Electrodes and Their Pseudocapacitive Properties

Author: KongDeShuai
Tutor: WangJianMing
School: Zhejiang University
Course: Physical and chemical
Keywords: Electrochemical capacitors Nano-porous structure Nickel hydroxide Nickel oxide Specific capacitance Go alloying
CLC: TM53
Type: Master's thesis
Year: 2011
Downloads: 152
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Abstract


Electrochemical capacitors is a new type of energy storage devices, has the advantages of high power density, good electrochemical reversibility and long cycle life, and in recent years has become one of the hot research field of electrochemical. The electrode material is one of the key factors affecting the performance of electrochemical capacitors. Nickel oxide / hydroxide inexpensive electrochemical performance attracted widespread attention. This thesis is a nickel-based composite membrane electrode was prepared by electrochemical method and investigated pseudocapacitive performance. Copper in the electrodeposition method, the Ni-Cu alloy plating by selective anodic dissolution, to obtain a porous nickel film. A porous nickel film as the substrate, using the the cathodic electrodeposition prepared nano-porous structure of nickel hydroxide in the membrane electrode. 1634,1563 and 1512 F · g-1, the ratio of the capacitance value of the prepared nickel hydroxide film electrodes under a current density of 2,5, and 10 A · g-1 of given respectively. Nano-porous structure of the metal nickel substrate to improve the electrochemical cycle stability of the membrane electrode of the nickel hydroxide in 1 mol-L \excellent in cycle stability that its great potential applications in the field of electrochemical capacitors. Ni-Cu alloy coating obtained by the electrodeposition method for electrochemical alloying treatment, nano-porous structure of a metallic nickel film was prepared, using the cycle voltammetry to an anodic oxidation treatment on the the nickel porous metal film KOH solution of 1 mol · L-1, to obtain a nano-porous structure of the Ni-based composite membrane electrode; at 300 ° C the temperature of the nickel-based composite membrane electrode treatment, to obtain a membrane electrode of NiO / Ni. scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), and the different electrochemical technique of the prepared membrane electrode Acta nature and pseudocapacitive characteristics were characterized by SEM, XRD and XPS test results show that the nano porous structure composite membrane prepared by Ni, Ni (OH) 2 and NiOOH. electrochemical experimental results show that the composition of the plating solution and The quality of the prepared composite membrane electrode have a large impact on its capacitive performance nano-porous structure of nickel-based composite membrane gives 578 F · g-20A · g-1 charge and discharge current density, obtained under optimized conditions an initial specific capacitance; after 1000 charge-discharge cycles, the value of its specific capacitance 544 F-g-1, the capacitance retention rate was 94%. the results of cyclic voltammetry, NiO-Ni-film electrodes in the 2 and the ratio of the capacitance value in the current density of 10 A · g-1, respectively 498 and 398 F-g-1 The study also found that the NiO-Ni film electrode having excellent cycle stability.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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