Co-phthalocyanin/CNTs nanocomposites: Synthesis, characterizations, and application as an efficient supercapacitor

•We introduce a new hybrid supercapacitor PcCo@CNTs.•PcCo@CNTs composite exhibits a high specific capacitance of 1112 F g−1 at 1.0 A g−1.•PcCo@CNTs composite exhibits a high energy density of 55.6 Wh kg−1.•PcCo@CNTs demonstrates excellent cyclability and superb capacitance retention of 95%.•Two PcCo@CNTs devices are able to illume the LED Lamp (2.7 V) for 45 min.