Minimization of ion transport resistance: diblock copolymer micelle derived nitrogen-doped hierarchically porous carbon spheres for superior rate and power Zn-ion capacitors

N-doped hierarchically porous carbon spheres are fabricated for Zn-ion capacitors, and they possess isotropic Zn²⁺ diffusion routes and abundant active sites, resulting in minimized transport resistance for fast Zn²⁺ storage and high capacity.