Study of the Correlation Between the Doped-Oxygen Species and the Supercapacitive Performance of TiC–CDC Carbon-Based Material

O-doping has proved to be one of the most promising approaches to further enhance the supercapacitive performance of carbon materials. However, it is presently not clear how the type of doped-O species affects the capacitive performance. In this paper, an attempt has been made to probe into the possible correlation between the type of doped-O species and the corresponding capacitive performance. Three O species (C=O, C–O and O–C=O) have been introduced onto TiC-derived carbon (TiC–CDC) by using a facile room-temperature oxidation strategy with three typical oxidizing agents (H2O2, HNO3 and (NH[Formula: see text]S2O[Formula: see text], respectively. The results have shown that as the content of the C=O species increases, both the specific capacitance and the capacitance retention for the oxidized TiC–CDC samples become higher, showing a positively correlative performance. This work suggests that optimizing the type of doped-O species will be great potential for obtaining the optimal electrochemical performances for the O-doped carbon materials.

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