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0220U000495,
0117U004287
,
Structural, morphological and electrochemical properties of electrode materials based on nanoporous carbon and sulfides and hydroxides of transition metals
Ostafiychuk Bogdan Kostyantynovych,
18-02-2020
G.V. Kyrdyumov Institute for Metall Physics of N.A.S. of Ukraine
The aim of work is to obtain and study the physical and chemical properties of nanostructured electrode materials based on nanoporous carbon, sulfides and hydroxides of transition metals and the creation of electrochemical capacitors with capacitive, pseudosubstantial and Faraday type for the energy accumulation on the basis of the characteristics of energy self-discharge. The technologies for producing nanoporous carbon materials by carbonization of plant-derived raw materials in gas and inert atmospheres with subsequent thermochemical activation have been proposed. Methods for increasing the specific surface area of the nanoporous carbon materials up to 1880 m2 / g was shown by varying such parameters as the carbonation temperature and atmosphere, the concentration and type of the activating agent. The activation method to achieve the specific capacitance values of the respective electrochemical capacitors up to 200 F / g are presented and Coulomb efficiency = 99.7% over 1000 charge / discharge cycles was achieved. The method of N-doping of nanoporous carbon materials and additional Fe-doping was optimized, which allows to increase the specific capacitance of electrochemical capacitors up to 260 F / g due to the course of rapid redox reactions with the participation of N-containing radicals, OH ions and metal oxides. A method of synthesis of MoS2 / C nanocomposites is proposed by combining hydrothermal technique with ultrasonic irradiation, which allows to obtain materials with a specific surface area up to 560 m2 / g and electrical conductivity 360 cm / m and provides the specific capacitance value of the respective hybrid electrochemical capacitors prototypes up to 260 F / g with a Coulomb efficiency of 98% (2000 cycles). For hybrid electrochemical capacitors based on Ni (OH) 2 / C, maximum capacitance values C= 320 F / g have been achieved with a Coulomb efficiency of 99% (500 cycles) with optimum content (10%) of HBM in the composite and subject to ultrasonic irradiation. For amorphous FeOOH / nanoporous carbon materials composites, maximum specific capacitance values of 180-220 F / g were achieved with a Coulomb efficiency of 85%.
Груб'як Андрій Богданович
Кайкан Лариса Степанівна
Мокляк Володимир Володимирович
Остафійчук Богдан Костянтинович
Челядин Володимир Любомирович
2020-04-02
Updated: 2025-12-16
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