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Graphitized hierarchical porous carbon nanospheres: simultaneous activation/graphitization and superior supercapacitance performance.
- Source :
- Journal of Materials Chemistry A; 5/14/2015, Vol. 3 Issue 18, p9565-9577, 13p
- Publication Year :
- 2015
-
Abstract
- A novel graphitized porous carbon nanosphere (GPCNS) material obtained by a convenient simultaneous activation and graphitization route, which was realized by heating resorcinol–formaldehyde (RF) resin nanospheres immersed with ZnCl<subscript>2</subscript> and FeCl<subscript>3</subscript> in an inert atmosphere, has been reported. A high graphitization level was achieved through the catalytic graphitization by reduced Fe metal, and the hierarchically micro/mesoporous structure was produced in a controlled fashion by tuning the mass ratio of the activating agent ZnCl<subscript>2</subscript> and a carbon precursor. An optimal sample of GPCNS-2 was prepared with a FeCl<subscript>3</subscript>/ZnCl<subscript>2</subscript>/RF mass ratio of 0.5 : 2 : 1, exhibiting a highly graphitized framework and uniform spherical morphology with an average diameter of ∼500 nm, as well as well-interconnected micro/mesoporous structure with a large surface area of 1664.8 m<superscript>2</superscript> g<superscript>−1</superscript>. Acting as an electrode material for a supercapacitor application in 6 M KOH electrolyte, GPCNS-2 displayed excellent electrochemical performance with a high specific capacitance of 402.5 F g<superscript>−1</superscript> at a current density of 1 A g<superscript>−1</superscript>. Moreover, an electrochemical impedance spectroscopy test demonstrated that the low internal electrical resistance of GPCNS-2 contributed a superior rate capability of above 75% retention rate even at 50 A g<superscript>−1</superscript>. Furthermore, the GPCNS-2 electrode possessed an outstanding cycling stability, and about 96% of its initial specific capacitance at 5 A g<superscript>−1</superscript> was maintained after 5000 cycles. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 3
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 102350627
- Full Text :
- https://doi.org/10.1039/c5ta00867k