Pore Sieving and Surficial Charge‐Driven Desolvation for High Spatial Charge Density Carbon Cathodes in Zinc‐Ion Hybrid Capacitors

Abstract Aqueous zinc‐ion hybrid capacitors (ZIHCs) have emerged as a sustainable energy storage technology. However, the slow diffusion of large solvated Zn 2+ within nanopores and the restriction on the electric double layer (EDL) thickness limit the spatial charge density in carbon electrodes. Herein, multi‐channel porous carbon nanofibers (MC‐PCNFs) are designed with customized porosity and high‐charge‐density interfaces to facilitate rapid [Zn(H 2 O) 6 ] 2+ desolvation and compact EDL formation. The designed hierarchical hollow structure maximizes ion accessibility, while precisely tuned 1.07 nm pores enable direct [Zn(H 2 O) 6 ] 2+ adsorption onto catalytic desolvation sites, significantly reducing the…

• UO
  University of Sydney
• NN
  National Natural Science Foundation of China

  Award: 22005147