Add time:08/04/2019         Source:sciencedirect.com

The orange peel based-activated carbons were prepared via hydrolysis and chemical activation, in which KOH, H3PO4 and ZnCl2 were used as activators, respectively. Textural characterization (XRD, SEM and N2 adsorption-desorption) and electrochemical tests (CV, GCD, EIS and the cycle life) were carried out to reveal the structure-property relationship of the activated carbon samples. The results showed that the activated carbon activated by H3PO4 (AC-H3PO4) presents the highest specific surface area (2209.7 m2/g) and pore volume (1.2374 cm3/g) compared with the others. Correspondingly, the AC-H3PO4 electrode also showed the highest specific capacitance of 240 F/g and 97% capacitance retention after 10,000 charge and discharge cycles. Moreover, the effect of the larger-size micropores (1.3–1.8 nm) of AC-H3PO4 sample and macropores of AC-KOH sample on the electrochemical performance of the carbon materials was discussed.

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