Title: Capacitive Mechanism of Oxygen Functional Groups on Carbon Surface in Supercapacitors,
Abstract: Oxygen functional groups are one of the most important subjects in the study
of electrochemical properties of carbon materials which can change the
wettability, conductivity and pore size distributions of carbon materials, and
can occur redox reactions. In the electrode materials of carbon-based
supercapacitors, the oxygen functional groups have widely been used to improve
the capacitive performance. In this paper, we not only analyzed the reasons for
the increase of the capacity that promoted by oxygen functional groups in the
charge-discharge cycling tests, but also analyzed the mechanism how the
pseudocapacitance was provided by the oxygen functional groups in the
acid/alkaline aqueous electrolyte. Moreover, we also discussed the effect of
the oxygen functional groups in electrochemical impedance spectroscopy.