J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2384-2391.DOI: 10.1016/j.jmst.2018.06.005
• Orginal Article • Previous Articles Next Articles
Tinghuan Wuac, Lixian Sunabc*(), Fen Xuabc*(), Dan Caiabc
Received:
2017-08-09
Revised:
2017-09-26
Accepted:
2017-10-30
Online:
2018-12-20
Published:
2018-11-15
Contact:
Sun Lixian,Xu Fen
Tinghuan Wu, Lixian Sun, Fen Xu, Dan Cai. Nitrogen-doped hierarchical porous carbon materials derived from diethylenetriaminepentaacetic acid (DTPA) for supercapacitors[J]. J. Mater. Sci. Technol., 2018, 34(12): 2384-2391.
Fig. 1. SEM images of (a) NPC-0.25-600, (b) NPC-0.50-600, (c) NPC-0.75-600 and (d) NPC-1.00-600, (e) and (f) TEM images of NPC-0.50-800 at different magnifications.
Fig. 2. (a) Nitrogen adsorption-desorption isotherms at 77?K, (b) DFT pore size distributions of NPC-0.00-600, NPC-0.25-600, NPC-0.50-600, NPC-0.75-600, and NPC-1.00-600.
Sample | SBET (m2 g-1)a | Vtotalb (m3 g-1) | Dc (nm) | C (at.%) | N (at.%) | O (at.%) |
---|---|---|---|---|---|---|
NPC-0.00-600 | 0 | 0 | 0 | 72.66 | 14.09 | 13.25 |
NPC-0.25-600 | 1126 | 0.49 | 2.3 | 66.68 | 9.45 | 19.71 |
NPC-0.50-600 | 1751 | 0.85 | 1.2 | 59.30 | 8.40 | 27.49 |
NPC-0.75-600 | 1072 | 0.75 | 1.1 | 63.78 | 4.32 | 23.35 |
NPC-1.00-600 | 1620 | 1.07 | 1.2 | 65.92 | 4.10 | 21.22 |
NPC-0.50-500 | 858 | 0.38 | 2.3 | 58.37 | 9.36 | 21.16 |
NPC-0.50-600 | 1751 | 0.85 | 1.2 | 59.30 | 8.40 | 27.49 |
NPC-0.50-700 | 2392 | 1.35 | 1.3 | 65.05 | 7.98 | 23.34 |
NPC-0.50-800 | 3214 | 1.92 | 1.3 | 67.22 | 6.85 | 23.28 |
Table 1 BET specific surface area, total pore volume, the average diameter of pore and elemental composition of the NPCS.
Sample | SBET (m2 g-1)a | Vtotalb (m3 g-1) | Dc (nm) | C (at.%) | N (at.%) | O (at.%) |
---|---|---|---|---|---|---|
NPC-0.00-600 | 0 | 0 | 0 | 72.66 | 14.09 | 13.25 |
NPC-0.25-600 | 1126 | 0.49 | 2.3 | 66.68 | 9.45 | 19.71 |
NPC-0.50-600 | 1751 | 0.85 | 1.2 | 59.30 | 8.40 | 27.49 |
NPC-0.75-600 | 1072 | 0.75 | 1.1 | 63.78 | 4.32 | 23.35 |
NPC-1.00-600 | 1620 | 1.07 | 1.2 | 65.92 | 4.10 | 21.22 |
NPC-0.50-500 | 858 | 0.38 | 2.3 | 58.37 | 9.36 | 21.16 |
NPC-0.50-600 | 1751 | 0.85 | 1.2 | 59.30 | 8.40 | 27.49 |
NPC-0.50-700 | 2392 | 1.35 | 1.3 | 65.05 | 7.98 | 23.34 |
NPC-0.50-800 | 3214 | 1.92 | 1.3 | 67.22 | 6.85 | 23.28 |
Fig. 3. (a) XRD patterns and (b) Raman spectra of NPC-x-600 (x?=?0.25, 0.50, 0.75 and 1.00); (c) XPS spectra of NPC-x-600 (x?=?0.25, 0.50, 0.75 and 1.00); (d) proportions of each nitrogen type in the total N content of NPC-x-600 (x?=?0.25, 0.50, 0.75 and 1.00).
Fig. 4. (a) CV curves of NPC-x-600 (x?=?0, 0.25, 0.50, 0.75 and 1.00) electrodes at the scan rate of 50?mV s-1 and (b) GCD curves of NPC-x-600 (x?=?0, 0.25, 0.50, 0.75 and 1.00) electrodes at the current density of 1?A g-1. (c) CV curves and (d) GCD curves of the NPC-0.5-600 electrode at different scan rates and current densities. (e) and (f) Specific capacitance retention ratio at different current densities of NPC-x-600 (x?=?0, 0.25, 0.50, 0.75 and 1.00).
Fig. 5. (a) CV curves of NPC-0.5-t (t?=?500, 600, 700, 800 and 900) electrodes at the scan rate of 50?mV s-1 and (b) GCD curves of NPC-0.5-t (t?=?500, 600, 700, 800 and 900) electrodes at the current density of 1?A g-1; (c) CV curves NPC-0.5-800 electrode at the scan rate of at 5-150?mV s-1; (d) GCD curves of NPC-0.5-t (t?=?500, 600, 700, 800 and 900) electrodes at the current density of 0.5-10?A g-1; (e) The Nyquist impedance plots of NPC-0.5-t (t?=?500, 600, 700, 800 and 900); (f) The cycling performance of the NPC-0.5-800 electrode collected at a current density of 10?A g-1 for 5000 cycles.
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