Akademik Veri Yönetim Sistemi
W-CAN WORLD CONGRESS ON APPLIED NANOTECHNOLOGY, Erzurum, Türkiye, 24 - 26 Kasım 2021, ss.127
Here, new carbon-based nanostructures were prepared via a one-step electrochemical method using
hexagonal and pentagonal polychlorinated organic rings as the carbon source (1,2). The
electrochemical growth of carbon nanostructures on substrates was accomplished via electrochemical
reduction of organic halides in nonaqueous electrolyte solutions containing hexachlorobenzene (HCB),
hexachlorocyclopentadiene (HCCP) and mixtures of HCB and HCCP with molar ratios of 2/2, 2/1.2 and
2/0.6. The effect of HCB/HCCP molar ratio, deposition time and temperature on the morphological and
structural properties of the carbon coatings was investigated using spectroscopic and microscopic
methods. The performance of the carbon nanostructures as supercapacitors was also studied using
cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy in
aqueous Na2SO4 solutions. The structural and chemical properties of the carbon nanostructures was
found to depend strongly on the nature and relative molar ratios of the precursors used in the
electrochemical reduction process. In the case of a 2/2 molar ratio of HCB to HCCP, mushroom-like
carbon nanostructures are obtained, whereas, higher molar ratios of HCB to HCCP (2/1.2 and 2/0.6)
result in carbon nanoflowers with graphitic features. Furthermore, the capacitance measurements
show that these novel carbon structures are potential candidates for supercapacitor-based energy
storage systems because they offer high specific capacitances (332–73 F g
-1 at 0.5 A g
-1
), good cycling
stabilities and a maximum energy density of 16 W h kg-1 at a power density of 250 W kg-1
.