Abstract
In this work, the morphological and electrical properties of the composite nanoporous carbon material/thermally expanded graphite or acetylene black have been investigated. Nanoporous carbon material was obtained from plant materials by its thermochemical activation based on potassium hydroxide. The dependence of the specific capacity of the nanoporous carbon/electrolyte electrochemical system on the applied potential was determined by the impedance spectroscopy method. Furthermore, the concentration of charge transfer and the density of states, as well as the flat-band potential of the system under research, were determined based on the Mott-Schottky model.
Highlights
The energy characteristics of electric energy storage devices are largely dependent on the electrode material and the electrolyte used as well as the electrochemical processes occurring at the electrode/electrolyte interface
Based on nanoporous carbon material, which is chemically resistant to most electrolytes, the impedance spectroscopy (IS) method can determine the dependence of the specific capacity of the system on the applied potential and the potential region in which charge accumulation occurs due to of double electric layer (DEL) formation
It is possible to determine the potentials of the passage of faraday reverse redox reactions and calculate the charge accumulated due to pseudocapacitance and to research the range of working potentials of the electrode material based on using the impedance spectroscopy and the Mott-Schottky model [4]
Summary
The energy characteristics of electric energy storage devices are largely dependent on the electrode material and the electrolyte used as well as the electrochemical processes occurring at the electrode/electrolyte interface. Of primary importance in the development of the maximum operating voltage value of a single cell and the amount of stored energy and power of the device is based on the selection of electrolyte solution Since these parameters depend on the decomposition voltage of the electrolyte and its electrical conductivity [1, 2]. It is possible to determine the potentials of the passage of faraday reverse redox reactions and calculate the charge accumulated due to pseudocapacitance and to research the range of working potentials of the electrode material based on using the impedance spectroscopy and the Mott-Schottky model [4]. The Mott-Schottky model was used to research the mechanisms of charge accumulation in the electrochemical systems investigation, evaluate the electrical conductivity of the system, and determine the potentials at which the transfer of electrons and ions through the composite/electrolyte interface occurs
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