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Activated carbons (ACs) were prepared from peanut shells by KOH activation under microwave heating and were used as electrode materials for electrochemical capacitors (ECs). The pore structure of the ACs was characterized by nitrogen adsorption and the electrochemical performance by galvanostatic charge–discharge and cyclic voltammetry. Results show that the ACs’ specific surface area, total pore...
Porous carbons (PCs) for super capacitors were prepared from coal tar pitch by a one-step microwave-assisted KOH activation with low KOH consumption. The surface area of the PC (PC2−M) made at a KOH/pitch mass ratio of 2 with microwave heating for 30min reaches 1786m2/g. The electrochemical performance of the PC electrode for super capacitors was evaluated in different electrolytes including KOH,...
The size and surface chemistry of graphene oxide (GO) dispersed in an aqueous solution are tuned by adjusting the pH value of the parent GO hydrosol. This method is based on the protonation of the carboxyl groups on GO nanosheets (GONs) in an acidic environment and the partial removal of oxygen-containing functional groups in strong basic conditions. GONs with a high electrochemical activity can be...
Graphene wrapping is used to experimentally understand how a carbon coating works in improving the electrochemical performance of the LiFePO 4 cathode for a lithium ion battery. A full wrapping of LiFePO 4 by graphene is realized by a self-assembly driven by the electrostatic interaction in a graphene oxide suspension. Results indicate that a partial graphene wrapping provides a balance...
Heat-resistant condensed poly-nuclear aromatic resin (COPNAR) was prepared using heavy distillate (>250°C, named DO) from distilled ethylene tar (ET). The basic properties of ET, DO and COPNAR were investigated by FT-IR, 1 H NMR, TGA and elemental analysis. The structural parameters of DO and ET were obtained by the improved Brown–Ladner method and the formation mechanism of the COPNAR...
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