Potassium ion storage technology as a promising substitute for the well developed lithium ion storage technology is still at the infancy stage of development, and exploring suitable electrode materials is critical for
its practical application. Here, the great feasibility of disordered, large
interlayer spacing, and oxygen-rich carbon nanosheets (CNSs) prepared
by chemical vapor deposition for potassium ion storage applications is
demonstrated. As an anode material, the CNSs exhibit outstanding rate
capability as well as excellent cyclic stability. Taking advantage of this, a
potassium ion hybrid capacitor (PIHC) is constructed by employing such
CNSs as the battery-type anode and activated carbon as the capacitortype
cathode. The resulting device displays a high energy density of 149 Wh kg−1, an ultrahigh power output of 21 kW kg−1, as well as a long cycling life (80% capacity retention after 5000 cycles), which are all close to the state-of-the-art values for PIHCs. This work promotes the development of high-performance anode material for potassium ion storage devices, and the designed PIHC pushes the energy density and power density to a higher level.