Abstract
Taking ZnO nanorods as a template, N-doped and porous carbon sheets (NPCS) were obtained by high-temperature carbonization and KOH activation of ZIF-8@ZnO hybrids. The morphology, structure and elemental composition of the as-obtained NPCS were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and N2 adsorption analyzer. The NPCS showed a large specific surface area (1190m2g−1), high specific capacitance of 290Fg−1 at current density of 1Ag−1, and superior charge–discharge cycle stability (the capacitance retains 94% after 10,000cycles at a high current density of 20Ag−1). Furthermore, the NPCS//NPCS two-electrode symmetric supercapacitor also showed high energy density and power density, and excellent rate performance of 81.9% capacitance retention when the current density was increased from 0.5 to 50Ag−1. These suggested the great potential applications of NPCS in high-performance electrochemical supercapacitors.
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