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Separacja proszków węglowych o dużym stopniu rozproszenia za pomocą metody tryboelektrycznej

Chabecki Piotr, Bordun Ihor, Ivashchyshyn Fedir

Przegląd Elektrotechniczny

2019

R. 95, nr 1

81--84

W artykule zostały przeanalizowane warunki rozdzielenia materiałów węglowych za pomocą metody tryboelektrycznej. Została opracowana konstrukcja i wykonane urządzenie powietrznej separacji tryboelektrycznej z oddzielaczem bębnowym. W drodze eksperymentu ustalono, że zastosowanie wibracji podczas podawania proszku do bębna oraz obróbka cieplna proszków istotnie wpływa na wartość tryboładunków. W celu uzyskania dobrego wyniku rozdzielenia materiałów węglowych konieczne jest osuszenie. Materiał osusza się w temperaturze 100 – 120 оС. Otrzymane za pomocą separacji frakcje węglowe zastosowano do budowy superkondensatorów. Określono pojemność właściwą. Ustalono, że największą pojemność właściwą posiada materiał zawierający cząstki o wymiarach 1-10 μm.

The article deals with conditions for carbon materials separation by triboelectric method. A triboelectric air separation device with a drum separator was designed and constructed. It was proved by experimentation that use of vibrations during the powder’s entry into the drum and thermal treatment has a significant effect on the tribocharge value. To achieve good results of carbon material separation, drying is required. The material is dried at 100о-120оC. The carbon fractions acquired by separation were used in construction of ultracapacitors. Specific capacitance was established; with the highest capacitance achieved by material containing particles in 1-10 μm size range.

Synthesis, morphology, electrical conductivity and electrochemical properties of α-Ni(OH)2 and its composites with carbon

Khemii O. M., Budzuliak I. M., Kotsyubynsky V. O., Yablon L. S., Ilnytskyi R. V., Boychuk V. M., Morushko O. V., Bandura K. V., Khemii M. M.

Materials Science Poland

2019

Vol. 37, No. 4

547--553

A simple and effective hydrothermal synthesis of spherical α-Ni(OH) )2 particles and α-Ni(OH)2/carbon composites was proposed. The mechanism of ultrafine α-Ni(OH) )2 phase forming and correlations between synthesis conditions, morphology, electrical conductivity were analyzed. It was found that carbon nanoparticles form an electric conductive cover on nickel hydroxide microparticles during synthesis which increases overall electronic conductivity of the composite material. α-Ni(OH)2 and α-Ni(OH) )2/C samples were tested as electrodes for hybrid supercapacitors. It was found that carbon coverings stabilize α-Ni(OH) )2 phase in the alkaline medium. The comparison of the influence of laser irradiation and ultrasonic treatment on the electrochemical performance of the obtained materials was made.

X Preparation and Characterization of Carbon-Based Composite Nanofibers for Supercapacitor

Gao D., Wang L., Wang C., Chang Y., Ma P.

Autex Research Journal

2017

Vol. 17, no. 2

129--134

Polyacrylonitrile (PAN)/Co(OAc)2/carbon nanotubes (CNTs) composite nanofibers were fabricated via electrospinning with N,N-dimethylformamide (DMF) as solvent, and by carbonization and activation of the above precursor nanofibers, porous carbon composite nanofibers were successfully obtained. Scanning electron microscope, X-ray diffraction, ASAP 2020, and Solartron 1470 were used to characterize the surface morphology, the phase composition, specific surface area, and electrochemical property of the nanofibers, respectively. The result showed that some of the fibers were broken after sintering, and the surface area and pore volume of the porous C/Cu/CNTs were 771 m2/g and 0.347 cm3/g, respectively. The specific capacitance of the composite nanofibers reached up to 210 F/g at the current density of 1.0 A/g. Its energy density and power density were 3.1 Wh/Kg and 2,337 W/Kg, respectively, at the current of 0.5 and 5 mA.