Abstract
The paper reveals the results of electrochemical studies of activated nanoporous carbon material (NPC) as an electrode material for electrochemical capacitors (EC), the charge of which is accumulated in an electrical double layer (EDL). NPC material has been obtained from raw material of plant origin (hemp shives) by thermochemical activation using phosphoric acid. It has been established that there is an optimal ratio between the amount of acid and precursor based on plant biomass that is equal to 0.75:1. The specific surface area of the obtained NPCwas ~ 2000 m2/g, and the maximum specific capacitance of EC models based on them was ~ 113 F/g. At the same time, the contribution of the EDL capacitance to the total capacitance is 60-80 %.
Highlights
nanoporous carbon material (NPC) material is an important element of human life support, improving their structure, the search for the cheapest sources of raw materials and new technological solutions is an urgent task of many researches
Important scientific and applied research tasks are finding the relationship between the structure of the raw material of organic origin and the structural-morphological and electrically conductive properties of activated carbon materials obtained by varying the modes of thermal and chemical activation, and elucidation of the influence of the conditions of their production and morphological characteristics on capacitive parameters of electrochemical systems formed on their basis
Depending on the areas of application of NPC, the choice of raw material (RM) in many cases may be decisive for the sorption properties of the obtained carbon material, which largely depend on the structure and composition of the precursor
Summary
NPC material is an important element of human life support, improving their structure, the search for the cheapest sources of raw materials and new technological solutions is an urgent task of many researches. It is promising to use electrodes made of activated carbon material obtained from raw materials of plant origin, given their low cost, environmental safety and chemical inertness to electrolytes [1]. In this regard, important scientific and applied research tasks are finding the relationship between the structure of the raw material of organic origin and the structural-morphological and electrically conductive properties of activated carbon materials obtained by varying the modes of thermal and chemical activation, and elucidation of the influence of the conditions of their production and morphological characteristics on capacitive parameters of electrochemical systems formed on their basis. The research purpose is to obtain lignocellulosebased nanoporous carbon materials (from hemp shives) with the use of thermochemical activation and to study the porous structure and electrochemical characteristics of the obtained NPC for use as EC electrodes
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