Morphology, conductivity and electrochemical properties of hydrothermal carbonized porous carbon materials

Abstract

The paper studies morphology, conductivity and electrochemical properties of carbon materials, obtained from raw plant material at different conditions of hydrothermal carbonization, using low-temperature porometry, impedance spectroscopy and galvanostatic charge-discharge. It is set, that in porous structure of carbon materials micropores are dominant; when carbonization temperature increased the specific surface and pore volume decrease more than 10 times. The temperature growth results in increasing the electrical conductivity of the carbon materials more than 6 orders. It is found, that the maximal value of specific capacity (1138 mA h/g) has an electrochemical system based on porous carbon carbonized at 1023 K.