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Nitrogen/oxygen co-doped monolithic carbon electrodes derived from melamine foam for high-performance supercapacitorsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8ta06471g
A novel monolithic carbon sponge is prepared by a ZnCl 2 -assisted carbonization of commercial melamine foam (MF) at 800 °C in a N 2 atmosphere. The as-prepared nitrogen/oxygen co-doped carbon sponges (NOCSs) can be directly applied as monolithic electrodes for supercapacitors without using any addi...
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Main Authors: | , , , , , , , |
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Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | A novel monolithic carbon sponge is prepared by a ZnCl
2
-assisted carbonization of commercial melamine foam (MF) at 800 °C in a N
2
atmosphere. The as-prepared nitrogen/oxygen co-doped carbon sponges (NOCSs) can be directly applied as monolithic electrodes for supercapacitors without using any additives. It is found that ZnCl
2
activation plays an important role in improving the supercapacitive behavior of NOCSs. Compared with the NOCS without ZnCl
2
activation treatment, the optimal NOCS-1/10, obtained with a ZnCl
2
/MF weight ratio of 1 : 10, has the best capacitive performance due to its unique porous architecture, rich pseudocapacitance-active species, and good electron/ion transfer feature. It exhibits a high specific capacitance (242 F g
−1
at a current density of 0.5 A g
−1
and 325 F g
−1
at a scan rate of 10 mV s
−1
) and good electrochemical cyclability (97% after 10 000 cycles at 5.0 A g
−1
). When being further assembled into an all-solid-state supercapacitor (PVA/KOH electrolyte), it can deliver an energy density of 4.33 W h kg
−1
at a power density of 250 W kg
−1
and 3.13 W h kg
−1
at a power density of 3 kW kg
−1
.
A novel nitrogen/oxygen co-doped carbon sponge (NOCS) is directly applied as a monolithic binder-free electrode for supercapacitors. It exhibits a high specific capacitance and excellent electrochemical cyclability. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/c8ta06471g |