Gradient Porous Carbon Superstructures for High‐efficiency Charge Storage Kinetics

Abstract Zinc‐ion hybrid supercapacitors (ZHSCs) are emerging for high‐efficiency energy storage. However, single‐layer cathode materials often suffer from low‐charge storage kinetics. Herein, an innovative gradient porous carbon superstructure with enhanced charge storage kinetics is developed, achieved by designing a concentration gradient carbon superstructure to facilitate rapid, directional ion transport and efficient ion storage. The gradient pore design with optimized micropore sizes (0.88 to 0.96 nm) and mesopore size (≈4 nm) enhances the hydrated zinc ion ([Zn(H 2 O) 6 ] 2+ ) diffusion, facilitating efficient desolvation and Zn 2+ ion storage. Furthermore, N/O co‐doping provides pseudo‐capacitance by…

• NN
  National Natural Science Foundation of China

  Award: 32101470)