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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50019

    Title: Improved pseudocapacitive performance and cycle life of cobalt hydroxide on an electrochemically derived nano-porous Ni framework
    Authors: Wu,CM;Fan,CY;Sun,IW;Tsai,WT;Chang,JK
    Contributors: 材料科學與工程研究所
    Date: 2011
    Issue Date: 2012-03-27 16:29:10 (UTC+8)
    Publisher: 國立中央大學
    Abstract: The pseudocapacitance and morphology of an electrodeposited cobalt hydroxide (Co(OH)(2)) significantly depends on the architecture of the electrode substrate. The nano-porous Ni framework, derived from the selective dissolution of Cu from a Ni-Cu alloy, effectively promotes the electrochemical utilization of deposited Co(OH)(2) even at a high loading amount condition. The great electronic and ionic conduction within the nano-structured electrode improves the energy storage performance of Co(OH)(2) as compared to that for a conventional flat Ni substrate. In this work, the Co(OH)(2) mass specific capacitance, evaluated using cyclic voltammetry (CV), only slightly decreases from 2650 to 2470 Fg(-1) when the potential sweep rate is substantially increased from 5 to 200 mVs(-1). The developed Ni(OH)(2)/NiOOH (from the nano-porous framework) incorporates with the deposited Co(OH)(2) upon CV cycling; the mixed hydroxide shows a noticeably synergistic capacitance. Furthermore, the dissolution of Co(OH)(2) in KOH electrolyte is greatly suppressed due to the incorporation of Ni(OH)(2)/NiOOH, consequently prolonging the electrode cycle life. (C) 2011 Elsevier B.V. All rights reserved.
    Appears in Collections:[材料科學與工程研究所 ] 期刊論文

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