The interlocked in situ fabrication of graphene@prussian blue nanocomposite as high-performance supercapacitor

and enhanced rate capability and long-term stability with 97.2% retention over 5000 cycles as well as coulombic efficiency of nearly 100%. Asymmetric supercapacitor cells were assembled by pairing an optimized nanocomposite electrode with an activated carbon negative electrode, which displayed a reversible operating voltage of 2.0 V. These high electrochemical performances render the G@PB-5 nanocomposite sheets promising for energy-storage hybrid electrodes.