Paper Information

Journal:   JOURNAL OF APPLIED CHEMISTRY   FALL 2016 , Volume 11 , Number 40; Page(s) 85 To 98.
 
Paper: 

PREPARATION OF SUPERCAPACITOR ELECTRODE MATERIAL BASED ON THE COBALT HYDROXIDE NANOPLATES VIA CATHODIC ELECTRODEPOSITION AND INVESTIGATION OF ITS SUPERCAPACITIVE PERFORMANCE

 
 
Author(s):  AGHAZADEH M., GHANADI MARAGHEH M.
 
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Abstract: 

In this study, cobalt hydroxide nanoplates were prepared from nitrate bath by electrochemical deposition method. Electrodeposition experiments were performed at a current density of 0.5 mA cm-2 in RT condition. The structure and morphology of the prepared sample were investigated via XRD, FT-IR, SEM and TEM analyses. The structural analyses by XRD and IR showed that the prepared deposit has pure b phase of Co (OH)2. Also, SEM and TEM observations revealed that the prepared sample has hexagonal plate-like morphology at nano-scale. The edge lengths of the plates range from 100 to 200 nm. The supercapacitive behavior of the prepared nanoplates was evaluated by cyclic voltammetry (CV) and charge-discharge tests. For this purpose, CV and charge-discharge tests of the electrode prepared from hydroxide nanoplates were conducted in the potential window of -0.2-0.55 V vs. Ag/AgCl at 1M KOH electrolyte. For first cycle of charge-discharge, the capacity as high as 915.5 F g-1 was measured which is in agreement with the values calculated form CV curves. Also, the capacity of 894.7 F g-1 was calculated for the 500th cycle, which only 2% capacity decay. These results confirmed that the b-Co(OH)2 nanoplates have excellent supercapacitive behavior and high cycle life, which can be a promising candidate for the electrochemical supercapacitors.

 
Keyword(s): NANOPLATES, COBALT HYDROXIDE, ELECTROCHEMICAL DEPOSITION, SUPERCAPACITIVE BEHAVIOR
 
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