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Electrochemical Deposited Nanoflakes Co(OH) 2 Porous Films for Electrochemical Capacitors
Author(s) -
Yu ZhanJun,
Dai Ying,
Chen Wen
Publication year - 2010
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201000063
Subject(s) - electrochemistry , cyclic voltammetry , chemistry , capacitance , electrode , chemical engineering , porosity , scanning electron microscope , substrate (aquarium) , analytical chemistry (journal) , supercapacitor , inorganic chemistry , materials science , composite material , organic chemistry , engineering , oceanography , geology
Nanoflakes Co(OH) 2 porous films have been successfully electrochemical deposited on nickel foam substrate from cobalt nitrate dissolved in water and water‐ethanol (1:1 volume ratio) solutions, respectively. Field emission scanning electron microscope (FESEM) studies indicate that the films electrodeposited from both solutions have nanoflakes porous structure. Cyclic voltammetry (CV) and galvanostaitc charge/discharge measurements show that the Co(OH) 2 films electrode deposited in water‐ethanol solution has excellent electrochemical capacitance between a potential range of 0‐0.4 V, and the maximum specific capacitance as high as 2369 F g −1 could be achieved in 2 M KOH solution at a charge‐discharge current density of 2 A g −1 , suggesting its potential application in the electrode material for electrochemical capacitors. Meanwhile, the properties of the nanoflakes Co(OH) 2 porous films electrodeposited in water solution are also discussed for comparison.