High-performance battery-type supercapacitor based on porous biocarbon and biocarbon supported Ni–Co layered double hydroxide

To achieve robust and efficient architecture for supercapacitor electrodes, seeds of Toona sinensis (STS) with honeycomb structure are used as template to obtain STS derived carbon (STSC), which act as substrate for both negative and positive electrodes of a battery-type supercapacitor. When activated by KOH, the as obtained anodic a-STSC-1-600 with a big specific surface area of 1031.6 m g−1 shows a specific capacitance of 210.0 F g−1 at 1 A...