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Modification and Supercapacitor Performance of NiO

Author: HanDanDan
Tutor: ZhangMiLin
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Supercapacitor Nickel oxide Doping Lanthanum Benjamin Yttrium Electrochemical properties
CLC: TM53
Type: Master's thesis
Year: 2007
Downloads: 344
Quote: 0
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Abstract


Super capacitor (supercapacitor) as a new type of energy storage device has the advantages of high energy density electrochemical reversibility and long cycle life. NiO as the pseudopotential capacitor electrode material, has a typical Faraday pseudocapacitive performance and low prices, thus become the focus of attention. This article was prepared by solid-phase Grinding nickel oxide, different grinding time and calcination temperature on the performance of nickel oxide capacitance. Electrochemical tested best grinding time of 2 h;, constant current charge and discharge tests of the nickel oxide electrode prepared by the different temperature calcined precursor, the specific capacity of the nickel oxide of the 300 ° C calcined prepared largest reached 123.39F · g -1 , is 10.0 times when calcined at 600 ℃. Prepared by chemical precipitation of nickel oxide, and study the impact of the precipitating agent on the performance of nickel oxide capacitance, which selected sodium carbonate as the precipitating agent, nickel oxide electrode in 5.0mol · L -1 KOH electrolyte of 3mA · cm -2 charge-discharge current density than the highest capacity, reach 180.00F g -1 . Nickel oxide electrode electrochemical properties of the electrolyte, nickel oxide electrode in 0.5 mol · L -1 of KOH electrochemical performance testing of LiOH and NaOH electrolyte, the electrolyte cation nickel oxide than the capacity, the specific discharge capacity of the electrode is 69.71F g -1 , the 71.20F · g -1 and 63.95F · g < sup> -1 . To test the impact of different concentration of KOH electrolyte electrode capacitance performance than the capacity increase as the electrolyte concentration increases, 7.0mol · L -1 KOH discharge capacity 290.26F · g -1 . Nickel oxide doping modification study doped La electrochemical performance SEM test results show that the La doped sample particle size decreased and dispersed uniformly optimal doping, electrochemical test ratio of 2.5%. Compared doped Y 400 ℃ calcined precursor preparation of Co-doped nickel oxide doped Y Co and pure nickel oxide electrode discharge capacity The at 73.39F · g -1 , 57.85F · g -1 of 46.15F · g -1 , show that the doping of rare earth elements to better improve the electrode capacitance performance. Prepared by chemical precipitation of nickel oxide positive electrode and activated carbon as the negative electrode, and assembled a small hybrid capacitor. Where current of 20mA and 200mA, the discharge capacity 12.35F · cm -3 and 7.73F · cm -3 , show that the electrode material is suitable for high-current discharge. The measured leakage current of 2.25mA.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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