Publishing House “Akademperiodyka”

National Academy of Sciences of Ukraine

Design of functional nanocomposites based on graphene and graphene-like materials, as well as organic conjugated polymers – promising electrode materials for supercapacitors and heterogeneous catalysts

Yaroslav I. Kurys
L.V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Olha A. Kozarenko
L.V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Vyacheslav G. Koshechko
L.V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Vitaly D. Pokhodenko

 

Abstract

The results obtained during the project on the development of promising functional nanocomposites based on graphene and graphene-like materials, as well as conducting polymers as active electrode materials for symmetric supercapacitors (SSC) and heterogeneous catalysts for quinoline hydrogenation are considered. Using a mechanochemical approach, nanocomposites based on polyaniline (PAni) and a number of 2D materials (nanostructured graphite – nG, molybdenum disulfide – nMoS2, tungsten disulfide – nWS2) were obtained. It was found that PAni/nG-based electrodes are able to provide the specific capacity of ~360 F/g in SSC and stability for at least 10,000 charge-discharge cycles. It is shown that PAni/nG-based SSC is able to operate at high current and the specific power of SSC can reach ~10 kW/kg at the specific energy of ~18 W∙h/kg. In the study of SSC based on nMoS2/PAni and nWS2/PAni, it was found that nanoparticles of d-metal sulfides to promote electrochemical reversibility of redox conversion in PAni at high potentials and contribute to the stability of nanocomposites during prolonged charge-discharge cycling. The specific capacity of such materials can reach 610 F/g and the specific power of SSC can reach ~4.1 kW/kg for specific energy ~23.5 W·h/kg. A number of Co-containing nanocomposites consisting of Co9S8 particles on Co,N,S-doped carbon was obtained by pyrolysis using various nanosized carbon materials and the monomer (5-aminoindole) – oxidant (ammonium persulfate) system. High catalytic activity of the obtained nanocomposites in the quinoline hydrogenation reaction was demonstrated – the yield of the target product (1,2,3,4-tetrahydroquinoline) is from ~85-90% to almost quantitative.

 

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