Improved pseudocapacitive performance and cycle life of cobalt hydroxide on an electrochemically derived nano-porous Ni framework

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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
Keywords:	MANGANESE OXIDE;ELECTRODE MATERIAL;ENERGY-STORAGE;CAPACITORS;SUPERCAPACITORS;FILMS;NANOWIRES;LIQUID;DEPOSITION;CO(OH)(2)
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.
Relation:	JOURNAL OF POWER SOURCES
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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