We fabricate cobalt oxalate-anchored cobalt foil electrode through anodization.
The hybrid electrode presents superior specific capacitance of 1269 F g−1.
The hybrid electrode retains 91.9% after super-long cycling of 100,000 cycles.
The present electrode has excellent flexibility and good mechanical properties.
The asymmetric CoC2O4//AC supercapacitor shows high energy and power density.