MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

Abstract

HighlightsA novel vacuum-assisted strategy is proposed to form N-doped carbon-encapsulated CoSe2 nanocrystals within hollow mesoporous carbon nanospheres (CoSe2@NC/HMCS) via a solid-state reaction.The “dual confinement” by both the N-doped carbon matrix derived from 2-methylimidazole and the small-sized pores of the hollow mesoporous carbon nanospheres can effectively prevent the overgrowth of CoSe2 nanocrystals.CoSe2@NC/HMCS exhibits an excellent electrochemical performance as the anode material for KIBs in terms of cycling stability and rate capability.