Activated Carbon by KOH and NaOH Activation: Preparation and Electrochemical Performance in K2SO4 and Na2SO4 Electrolytes

Activated carbons were successfully prepared from rice husk (RH) by chemical activation using KOH (RH-K4) or NaOH (RH-N3) as activating agents and characterized by means of SEM, EDX, FTIR, Raman, Boehm titration, and TGA methods. The as-prepared activated carbon samples are composed of spherical par...

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Bibliographic Details
Published in:Russian journal of electrochemistry 2019-09, Vol.55 (9), p.900-907
Main Authors: Khu Le Van, Thu, Thuy Luong Thi, Thu, Ha Nguyen Thi, Van Hoang, Hung
Format: Article
Language:English
Subjects:
Activated carbon
Activation
Basal plane
Chemistry
Chemistry and Materials Science
Cracks
Crystals
Current density
Electric double layer
Electrochemical analysis
Electrochemistry
Electrodes
Electrolytes
Electrons
Functional groups
Organic chemistry
Physical Chemistry
Potassium hydroxides
Potassium sulfate
Sodium hydroxide
Sodium sulfate
Titration
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Summary:Activated carbons were successfully prepared from rice husk (RH) by chemical activation using KOH (RH-K4) or NaOH (RH-N3) as activating agents and characterized by means of SEM, EDX, FTIR, Raman, Boehm titration, and TGA methods. The as-prepared activated carbon samples are composed of spherical particles with lots of cracks and crevices as showed in SEM images. They have numerous surface functional groups which proofed by FTIR and Boehm titration. Raman result revealed that the crystalline size along basal plane ( L a ) of RH-K4 and RH-N3 are 3.27 and 3.46 nm, respectively, which demonstrated the higher disorder degree of RH-K4 compared to RH-N3. Cyclic voltammetry and charge-discharge tests exhibit the electric double layer capacitor characteristic of the electrodes. RH-K4 shows a better performance at low scan rate and current density, whereas RH-N3 is superior at high scan rate and current density. At all experimental conditions studied, the as-prepared electrodes behave better in K 2 SO 4 electrolyte than in Na 2 SO 4 electrolyte.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193519070115