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Nitrogen and Sulfur Doped Mesoporous Carbons, Prepared from Templating Silica, as Interesting Material for Supercapacitors
Author(s) -
Brandiele Riccardo,
Picelli Luca,
Pilot Roberto,
Causin Valerio,
Martucci Alessandro,
Rizzi Gian A.,
Isse Abdirisak A.,
Durante Christian,
Gennaro Armando
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701404
Subject(s) - materials science , mesoporous material , supercapacitor , cyclic voltammetry , carbon fibers , heteroatom , bet theory , dielectric spectroscopy , chemical engineering , pyrolysis , scanning electron microscope , specific surface area , inorganic chemistry , electrochemistry , electrode , chemistry , organic chemistry , composite material , catalysis , engineering , ring (chemistry) , composite number
Highly accessible surface area and heteroatom‐doping are desired properties for carbon electrode materials to be used in electrochemical supercapacitors. In this paper, nitrogen and sulfur doped carbon materials with wide mesopores (13‐14 nm) were synthetized according to a hard template approach by pyrolysis of sucrose, 1,10‐phenanthroline or dibenzothiophene as carbon, nitrogen‐carbon or sulfur‐carbon precursors, respectively. The morphology and dimension of mesopores were induced by sacrificial SiO 2 nanoparticles (10‐20 nm), which are removed at the end of synthesis by an etching solution to reveal a network of hemispherical pores. The interconnected pore structure was confirmed by scanning electron microscopy and transmission electron microscopy. X‐ray photoemission spectroscopy and elemental analysis confirmed the presence of nitrogen and sulfur functional groups. The prepared materials were fully characterized by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy in 0.5 M H 2 SO 4 . Notwithstanding the small surface (200 m 2 g ‐1 ) determined by BET method, the nitrogen doped mesoporous carbon showed high specific gravimetric (∼170 F g ‐1 ) and surface (∼835 F m ‐2 ) capacitances that are comparable to those of materials with much higher surface area (5‐10‐fold higher).