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

Su Hyun Yang, Seung Keun Park, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, a novel vacuum-assisted strategy is proposed to homogenously form Metal–organic frameworks within hollow mesoporous carbon nanospheres (HMCSs) via a solid-state reaction. The method is applied to synthesize an ultrafine CoSe2 nanocrystal@N-doped carbon matrix confined within HMCSs (denoted as CoSe2@NC/HMCS) for use as advanced anodes in high-performance potassium-ion batteries (KIBs). The approach involves a solvent-free thermal treatment to form a Co-based zeolitic imidazolate framework (ZIF-67) within the HMCS templates under vacuum conditions and the subsequent selenization. Thermal treatment under vacuum facilitates the infiltration of the cobalt precursor and organic linker into the HMCS and simultaneously transforms them into stable ZIF-67 particles without any solvents. During the subsequent selenization process, the “dual confinement system”, composed of both the N-doped carbon matrix derived from the organic linker and the small-sized pores of HMCS, can effectively suppress the overgrowth of CoSe2 nanocrystals. Thus, the resulting uniquely structured composite exhibits a stable cycling performance (442 mAh g−1 at 0.1 A g−1 after 120 cycles) and excellent rate capability (263 mAh g−1 at 2.0 A g−1) as the anode material for KIBs.[Figure not available: see fulltext.].

Original languageEnglish
Article number9
JournalNano-Micro Letters
Volume13
Issue number1
DOIs
Publication statusPublished - 2021 Jan 1

Keywords

  • Cobalt selenides
  • Electrode materials
  • Hollow mesoporous carbon nanospheres
  • Metal–organic frameworks
  • Potassium-ion batteries

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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