TY - JOUR

T1 - Rice Husk Derived Micro-Mesoporous Carbon Materials as Active Components of Supercapacitor Electrodes

AU - Lebedeva, M. V.

AU - Yeletsky, P. M.

AU - Ayupov, A. B.

AU - Kuznetsov, A. N.

AU - Gribov, E. N.

AU - Parmon, V. N.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Activated carbon materials (CM) were prepared from rice husk carbonized in the fluidized catalysts bed reactor. Textural characteristics of CM were studied by the adsorption of nitrogen at 77 K. Variation of synthesis conditions (conditions of carbonization and following activation) allowed to obtain materials with specific BET surface area from 440 to 2290 m2/g. Utilization of sodium or potassium carbonates results in the BET surface area up to 1200 m2/g. Activation by hydroxides of sodium or potassium yields the samples with the more developed surface up to 2290 m2/g. Electrochemical properties and capacitive characteristics were examined by cyclic voltammetry and chronopotentiometry in galvanostatic mode in aqueous electrolyte 1 M H2SO4 and ionic liquid BMIMBF4. It was shown, that at low charge/discharge rate (0.2 А/g) gravimetric capacitance depends linearly on specific surface of CM and does not depend on electrolyte nature. Insignificant (in the case of 1 М H2SO4) and significant (in the case of ionic liquid) decrease of specific capacitance is observed at high rates of charge/discharge (2 А/g), which is explained by influence of porous structure.

AB - Activated carbon materials (CM) were prepared from rice husk carbonized in the fluidized catalysts bed reactor. Textural characteristics of CM were studied by the adsorption of nitrogen at 77 K. Variation of synthesis conditions (conditions of carbonization and following activation) allowed to obtain materials with specific BET surface area from 440 to 2290 m2/g. Utilization of sodium or potassium carbonates results in the BET surface area up to 1200 m2/g. Activation by hydroxides of sodium or potassium yields the samples with the more developed surface up to 2290 m2/g. Electrochemical properties and capacitive characteristics were examined by cyclic voltammetry and chronopotentiometry in galvanostatic mode in aqueous electrolyte 1 M H2SO4 and ionic liquid BMIMBF4. It was shown, that at low charge/discharge rate (0.2 А/g) gravimetric capacitance depends linearly on specific surface of CM and does not depend on electrolyte nature. Insignificant (in the case of 1 М H2SO4) and significant (in the case of ionic liquid) decrease of specific capacitance is observed at high rates of charge/discharge (2 А/g), which is explained by influence of porous structure.

KW - activated carbon materials

KW - carbonization

KW - ionic liquids

KW - rice husk

KW - supercapacitors

KW - ACTIVATION

KW - DOUBLE-LAYER CAPACITORS

KW - POROUS CARBON

KW - ELECTROLYTES

KW - HIGH-PERFORMANCE SUPERCAPACITORS

KW - SILICA TEMPLATES

KW - TEXTURE

KW - TEMPERATURE

KW - ELECTROCHEMICAL CAPACITORS

KW - IONIC LIQUIDS

UR - http://www.scopus.com/inward/record.url?scp=85049577108&partnerID=8YFLogxK

U2 - 10.1134/S2070050418020125

DO - 10.1134/S2070050418020125

M3 - Article

AN - SCOPUS:85049577108

VL - 10

SP - 173

EP - 180

JO - Catalysis in Industry

JF - Catalysis in Industry

SN - 2070-0504

IS - 2

ER -