期刊
RSC ADVANCES
卷 9, 期 15, 页码 8137-8145出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra10022e
关键词
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资金
- National Key Research and Development Program of China [2017YFA0403102]
- National Natural Science Foundation of China [21573072, 21773068, 21811530273]
- Shanghai Leading Academic Discipline Project [B409]
A soluble and easily dispersive cross-linked poly(ionic liquid), copolymer of 1-vinyl-3-butylimidazolium bromide ([VBIM][Br]) and divinylbenzene (DVB), was used as a precursor for nitrogen doped porous carbons (NPCs) with SiO2 (from tetraethyl orthosilicate) as a template. The NPCs were characterized by infrared (IR) spectroscopy, nitrogen adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, thermo gravimetric analysis (TGA), elemental analysis and X-ray photoelectron spectroscopy (XPS). The specific surface area and porosity of NPCs depended on the carbonization temperature, the SiO2/[VBIM][Br] ratio and the precursors. Under the optimized conditions, the NPC prepared from cross-linked poly(ionic liquid), P([VBIM][Br]-0.1DVB), gave a high specific surface area up to 1324 m(2) g(-1). XRD indicated that amorphous and disordered graphitic layers were dominant in NPCs. The nitrogen content was about 4-5 wt% in NPCs, and the nitrogen bonding state observed using XPS analysis was mainly pyridinic- and pyrrolic-N. Meanwhile, the cyclic voltammetry, gravimetric charge-discharge curves and electrochemical impedance spectroscopy of the NPCs were also investigated, the specific capacitance was up to 243 F g(-1) at 0.1 A g(-1), and the retention ratio was nearly 100% after charge-discharge cycling 2400 times at 2 A g(-1) in 6 M KOH electrolyte.
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