Investigation of the effect of modification of carbon material from raw wood on its electric capacitance
G. YU. SIMENYUK, N. S. ZAKHAROV, A. N. PRIGORODOVA (POPOVA), V. G. DODONOV, V. M. PUGACHEV
Federal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, Kemerovo, Russia
Keywords: electrode material, supercapacitor, charcoal, cyclic voltammetry, pseudocapacitance
Abstract
Modes of modification of carbon material obtained from wood raw materials are described in order to improve the electric capacitance characteristics for subsequent application as an electrode material in supercapacitors. The effect of two modification methods is considered: treatment with hydrogen at 1000 °C, treatment with a concentrated solution of hydrogen peroxide (37 wt%) at 60 °C. It is revealed that the greatest improvement in the functional properties of the material occurs when it is treated with hydrogen peroxide. Analyzing the sorbometry data, it was found that the specific surface area of the sample modified in this way increases by 20 % due to the formation of micropores. In this case, according to IR spectroscopy data, electrochemically active carbonyl groups are formed in the sample. Testing of the obtained electrode material in a model electrochemical cell simulating supercapacitor operation revealed an increase in its electrical capacity by 60 % relative to the initial sample.
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