Significance of optimal N-doping in mesoporous carbon framework to achieve high specific capacitance
| Title | Significance of optimal N-doping in mesoporous carbon framework to achieve high specific capacitance |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Sahoo, MK, Gogoi, P, Rajeshkhanna, G, Chilukuri, SV, G. Rao, R |
| Journal | Applied Surface Science |
| Volume | 418 |
| Issue | Part: A |
| Pagination | 40-48 |
| Date Published | OCT |
| Type of Article | Article |
| Abstract | Nitrogen-doped mesoporous carbon (NMC) has been synthesized by sol-gel process using a mixture of phenol and formaldehyde as source of carbon, and melamine as source of nitrogen. The Ludox-AS40 (40 wt% SiO2) is employed, for the first time, as hard template to obtain polymeric gel by prolonged heat treatment at 80 degrees C. The wt% of nitrogen is tuned by varying the weight ratio of melamine to phenol. Stable mesoporous carbon frameworks are obtained by pyrolysis of the dry gel at 800 degrees C in nitrogen atmosphere and treated with alkali to remove silica. One of the carbon framework samples has 11 wt% nitrogen doping and shows pore volume of 0.5 cm(3) g(-1) and surface area 609 m(2) g(-1). The other carbon frame work sample has 6 wt% nitrogen doping and shows higher pore volume of 1.1 cm(3) g(-1) and surface area 736 m(2) g(-1). The later sample exhibits highest electrochemical capacitance of 196 F g(-1) at 0.5 A g(-1) while the former shows only 146 F g(-1) at 0.5 A g(-1). However, both the NMC electrodes show good cyclic performance (91% of the initial capacitance after 1000 cycles) in an aqueous KOH electrolyte. This study demonstrates that there is an optimum level of nitrogen doping required to keep the meso-structure of carbon network intact, simultaneously maintaining high surface area and sufficient electrical conductivity for electrochemical applications. (C) 2016 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.apsusc.2016.11.181 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 3.15 |
Divison category:
Catalysis and Inorganic Chemistry
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