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Carbon surface with large oxygen and carbon ratio (O/C) indicated an outstanding electro-catalytic activity toward L-ascorbic acid oxidation,compared to platinum group metals.However,interrelation of surface functional groups and its electro-catalytic activity is still unclear.In this paper,we prepared different levels of oxidized carbons by a simple acid treatment and investigated the correlation between the surface oxygen functional groups of acid-treated carbon and electro-catalytic activity in an electrooxidation of L-ascorbic acid.Positively charged carbon was demonstrated by lone pair electron of oxygen from valence band spectra study.It was revealed that the positively charged carbon,especially involved in carbonyl,showed enhanced the electro-catalytic activity through both better adsorption of negatively charged reactants and lowered LUMO by electmnegativity of oxygen.