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ChemComm
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DOI: 10.1039/C5CC07535A
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to 100 mV s-1, indicating a quick charge propagation capability of
both double layer capacitances (Fig. 3a). The capacitance decreased
with the increase of scan rate (Fig. 3b). Similar shapes of CV curves
and trend of capacitance were observed for NCM and NCM-M, but
with lower capacitance (Fig. S12, Table S2). A capacitance of 247 F
g-1 at 2 mV s-1 and 163 F g-1 at 100 mV s-1 were recorded. In
contrast, the capacitance for NCM and MCM-M was much lower, 12
F g-1 and 109 F g-1 at 100 mV s-1 respectively (Table S2, ESI†). This
increase in capacitance approximately agrees with the increase of
surface area and N content, although not proportionally. The
significant increase from NCM-M to NCM-MF may be attributed to
the considerably increased microporosity in NCM-MF (Table S1).
The rate performance of NCM-MF electrode was evaluated by
galvanostatic charge/discharge at different current densities (Fig.
3c). The specific capacitance was gradually reduced with the
increasing current density (Fig. 3d). The specific capacitance
remained above 200 F g-1 at the current density of 6 A g-1 (Table S2,
ESI†), which showed greater or comparable discharge capacity
compared to relevant carbon nanofibers.25-26 The superior
performance of the NCM-MF electrode was also confirmed by
impedance spectroscopy (Fig. S13), indicating the decreased
interfacial charge-transfer resistance. Furthermore, the NCM-MF
showed the smallest internal resistance determined by IR drop from
the charge/discharge curves (Fig. S14). This NCM-MF electrode had
good stability as confirmed by galvanostatic charge/discharge
1
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1
measurements at a current density of
4 A
g-1. The specific
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A novel one-pot synthesis strategy to prepare nanofibrous
microsphere using W/O emulsion via pH-triggered gelation of
perylene diimide derivatives has been demonstrated. These
microspheres can be pyrolyzed under N2 to produce
,
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introduced to generate N-doped and templated carbon
microspheres with the nanofiber diameter around 20 nm. The
nanofibrous carbon microspheres are evaluated as electrode
for supercapacitor, showing a high specific capacitance of 284
F g-1 at a current density of 1 A g-1, 214 F g-1 at 6 A g-1, and
good rate capability with the specific capacitance remaining at
67% after 1000 cycles at current density of 4 A g-1.
XL acknowledges the joint PhD studentship from China
Scholarship Council. The authors are grateful for the access to
the facilities in the Centre for Materials Discovery at the
University of Liverpool. ZW thanks the NSFC (Grant
No.21127010) and Jilin Provincial Science and Technology
Department (Grant No. 20100701) for financial supports.
MacDonald and R. S. Ruoff, Nature Commun. 2014, 5:3317.
Notes and references
4 | J. Name., 2012, 00, 1-3
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