ELECTROCHEMICAL CHARACTERISTICS ANALYSIS OF ACTIVATED CARBON FROM CORN WASTES
Keywords:
waste corn, activated carbon, electric double layer capacitors, specific capacity, hydrophilicityAbstract
The paper analyzes the potential of biomass waste of growing and processing corn for grain in Ukraine. Activated carbon is obtained from corn stigmas, stems and ears of corn. Pyrolysis was carried out in an inert atmosphere, followed by activation with the help of steam at the temperature of 800 ± 5 °C. Based on these obtained carbon materials, laboratory samples of capacitors of electric double layer with an alkaline electrolyte were prepared and studied. It is spoken in detail about cyclic voltammetry and chronoamperometry methods that were used during studying of properties of bio-carbonic materials. It draws our attention to reversibility of the charging and discharging processes and relatively high values of specific capacity – 101 F/g for coal of corn stigmas, 86 F/g for carbon of ears and 114 F/g for coal of corn stalks. High hydrophilicity of the core and stiff ring of the ear of corn are shown. On microphotography of the cut stiff ring, the presence of a developed system with evenly allocated channelscapillaries with a diameter of 10–30 μm and wall thickness, mostly, about 2 μm is set. Due to this fact, as well as environmental safety and low cost of raw materials, waste processing of corn with high content of channels for sorption of dopants is a promising raw material for activated carbon with predetermined propertiesReferences
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