NICO-LAYERED DOUBLE HYDROXIDE COATING ON NITROGEN/OXYGEN CO-DOPED CARBON NANOCAGE COMPOSITE FOR HIGH-PERFORMANCE SUPERCAPACITOR ELECTRODE

摘要

NICKEL–COBALT-LAYERED DOUBLE HYDROXIDE (NICO-LDH) HAS RECEIVED CONSIDERABLE ATTENTION IN THE FIELD OF SUPERCAPACITOR||HOWEVER, THE LOW CONDUCTIVITY AND STRUCTURAL INSTABILITY LIMIT ITS PRACTICAL APPLICATIONS. IN THIS PAPER, A FACILE STRATEGY FOR THE FABRICATION OF NICO-LAYERED DOUBLE HYDROXIDE (NICO-LDH) COATING ON NITROGEN/OXYGEN CO-DOPED CARBON NANOCAGES (NOCN) WAS PROPOSED IN THIS PAPER. THIS MULTICOMPONENT NANOCOMPOSITE, NICO-LDH@NOCN, HAS A HIGH SPECIFIC CAPACITANCE OF 1842 F G−1 AT 1 A G−1, A REMARKABLE RATE CAPABILITY OF 68.1% INCREASING THE CURRENT DENSITY TO 30 A G−1, AND EXCELLENT CYCLING STABILITY OF 72.1% AFTER 1000 CYCLES. FURTHERMORE, AN ASYMMETRIC SUPERCAPACITOR (ASC) COMPOSED OF NICO-LDH@NOCN AS A POSITIVE ELECTRODE AND NOCN AS A NEGATIVE ELECTRODE WAS FABRICATED. THE ASC SHOWS A SUPERIOR ENERGY DENSITY OF 31.6 WH KG−1 AT A POWER DENSITY OF 700 W KG−1, WHICH SUGGESTS THE GREAT PRACTICAL APPLICATION POTENTIAL OF SUPERCAPACITOR.