One-step Microwave Synthesis CoOOH/Co(OH)2/CNT Nanocomposite As Superior Electrode Material for Supercapacitors
Ionics(2020)
摘要
CoOOH/Co(OH)2/CNT nanocomposite was rapidly prepared through one-step microwave method and characterised by XRD, SEM and XPS. Electrochemical performance was analysed via cyclic voltammetry, chronopotentiometry, cyclic charge-discharge and electrochemical impedance in a 6 M KOH electrolyte. The optimum capacitance of CoOOH/Co(OH)2/CNT can achieve 768 F g−1 at 2 A g−1 and could be further increased by 144% (1104 F g−1) after 700 cycles. An excellent cycling stability of 77.5% capacitance retention of the highest value (111% capacitance retention of the original value) was achieved after 3000 cycles. An asymmetric supercapacitor device on the basis of the CoOOH/Co(OH)2/CNT//AC showed the maximum energy density of 25 Wh kg−1 at a power density of 0.42 kW kg−1 and maintained 85% of the highest specific capacitance value after 20,000 cycles, thereby indicating its immense potential in energy storage devices.
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关键词
Supercapacitor,Microwave,Cobalt hydroxide,Cobalt oxyhydroxide,CNT
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