Monodisperse carbon microspheres derived from potato starch for asymmetric supercapacitors
[Display omitted] Uniform and monodisperse carbon microspheres (MCMSs) are synthesized via a catalyst-free and hydrothermal process by following a high temperature carbonization, in which potato starch is used as raw material. The morphology and microstructure of the as-obtained samples are characte...
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Published in | Electrochimica acta Vol. 167; pp. 303 - 310 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
10.06.2015
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
Uniform and monodisperse carbon microspheres (MCMSs) are synthesized via a catalyst-free and hydrothermal process by following a high temperature carbonization, in which potato starch is used as raw material. The morphology and microstructure of the as-obtained samples are characterized using SEM, TEM, XRD, Raman, FTIR and BET. TEM image shows that the products consist of carbon microspheres with a mean diameter of about 250nm. BET specific surface area of MCMSs is up to 456m2·g−1. Furthermore, the supercapacitive performances of the MCMSs are investigated by cyclic voltammogram (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). The experimental results indicate that the MCMSs exhibits not only high specific capacitance of 245F·g−1 and good rate capability (the specific capacitance at 10A·g−1 is 61% of that at 1A·g−1), but also excellent cycle stability (no obvious capacitance decay after 4,000 cycles at 3A·g−1). An asymmetric electrochemical capacitor is assembled by using the obtained MCMSs as negative electrode and reduced graphene oxide (RGO) as positive electrode. The as-assembled MCMSs//RGO capacitor can cycle reversibly in a voltage of 0–1.5V and give a high energy density of 21.5Wh·kg−1 at a power density of 759W·kg−1. |
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ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/j.electacta.2015.03.190 |