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

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Abstract

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 (La) 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 K2SO4 electrolyte than in Na2SO4 electrolyte.

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Funding

This work was financially supported by the Vietnamese Ministry of Education and Training for a basic research project under grant number B2016-SPH-20.

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Authors and Affiliations

  1. Department of Physical and Theoretical Chemistry, Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Hanoi, Cau Giay, Vietnam

    Khu Le Van, Thuy Luong Thi Thu, Ha Nguyen Thi Thu & Hung Van Hoang

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  1. Khu Le Van
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  2. Thuy Luong Thi Thu
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Correspondence to Khu Le Van.

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Khu Le Van, Thu, T.L., Thu, H.N. et al. Activated Carbon by KOH and NaOH Activation: Preparation and Electrochemical Performance in K2SO4 and Na2SO4 Electrolytes. Russ J Electrochem 55, 900–907 (2019). https://doi.org/10.1134/S1023193519070115

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