Nanoconfined Carbonization Enabling High-Density Porous Carbon for Jointly Superior Gravimetric and Volumetric Zinc-Ion Storage

Jointly exceptional gravimetric and volumetric capacitances in porous carbons were achieved through nanoconfined carbonization. Critical roles of 1.2–5.5 nm pores for zinc-ion storage and pores above 5.5 nm for rapid ion diffusion were revealed.