Ultra-high surface area and nitrogen-rich porous carbons prepared by a low-temperature activation method with superior gas selective adsorption and outstanding supercapacitance performance

By Yan Zhang, Lu Liu, Peixin Zhang, Jun Wang, Mai Xu, Q. Deng, Zheling Zeng, Shuguang Deng. Chemical Engineering Journal, 2019

216 citations recorded by the source corpus.

Abstract Ultra-high surface area and nitrogen-rich porous carbons are prepared via a low-temperature and one-pot N-doping method. The obtained carbons exhibited large surface area of 2965.7 m2 g−1 and high N-doping level of 6.6 at%, endowing them as efficient gas-mixture selective adsorbents and excellent supercapacitor electrodes. By optimizing the ratio of porogen/carbon or activation temperature, the as-prepared N-rich microporous carbons possessed outstanding mixed-gas selectivities of CO2/N2 (77.9), CO2/CH4 (12.8), and CH4/N2 (4.9) at 298 K and 1 bar. Furthermore, three samples with almost identical surface properties were successfully prepared by judicious selection of activation conditions, thus the favorable effect of pyrrole/pyridine (N-5) species on gas-mixture separation could be clearly demonstrated. Moreover, as supercapacitor electrodes, the N-doped materials displayed extremely high supercapacitance of 350.2 F g−1 at a current density of 0.5 A g−1 in a 6 M KOH electrolyte solution with superior rate retention of 74.2% at 10 A g−1 and 98% capacitance retention after 8000 cycles.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/955acb218a849a4058a083ded20cc73c1ad98404