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The electrochemical behavior of porous carbons based on carbon fibers and those based on phenolic was evaluated by cyclic voltammetry via the Fe 2+ /Fe 3+ redox couple. An irreversible electrochemical response obtained from the fiber-based porous carbons was made reversible by coating of the porous carbons with graphite flakes or carbon black; the electron-transfer rate...
Electrochemical formation of graphite intercalation compounds (GICs) has been studied in the electrolyte with mixed sulfuric acid and acetic acid. The results show that, with addition of acetic acid, GICs can be synthesized in the electrolyte with sulfuric acid concentration as low as 3.6M, even though no GIC is formed in pure acetic acid. The stage structure of the synthesized GICs varies with the...
Oxidation changed the electrochemical behavior of carbon black, catalytically grown carbon filaments and pitch-based carbon fibers from irreversible to reversible, as shown by cyclic voltammetry using the Fe(CN) -3-46 redox couple. Thermal oxidation of carbon black (16%) yielded a higher electron transfer rate constant k s than did chemical (HCl or HNO 3 ...
A formic acid-graphite intercalation compound (HCOOH-GIC) has been successfully synthesized by an electrochemical process whereby formic acid solution serves as both the electrolyte and the intercalate source. Stage structures of 3, 4 and 5 have been revealed by both X-ray diffraction and Raman spectroscopy. Formation of HCOOH-GIC was achieved by controlling the apparent anodic current density in...
Hairy carbons were prepared by catalytic growth of carbon hairs (diameter 0.05-0.2 μm, at least partly crystalline) on carbon black, graphite particle and carbon fiber substrates. Of the substrates used, the most abundant hair growth was achieved using carbon black, due to the confinement of the catalyst size by the pores in the carbon black. The cyclic voltammetric response of all hairy carbons...
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