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

作　　者：Su Hyun Yang Seung‑Keun Park Yun Chan Kang 

机构地区：[1]Department of Materials Science and Engineering,Korea University,Anam‑Dong,Seongbuk‑Gu,Seoul 136‑713,Republic of Korea [2]Department of Chemical Engineering,Kongju National University,1223‑24 Cheonan‑daero,Seobuk‑gu,Cheonan 31080,Republic of Korea

出　　处：《Nano-Micro Letters》2021年第1期123-137,共15页纳微快报（英文版）

基　　金：Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(NRF-2019R1A2C2088047 and NRF-2020R1C1C1003375).

摘　　要：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 highperformance 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.

关 键 词：Metal-organic frameworks Hollow mesoporous carbon nanospheres Potassium-ion batteries Cobalt selenides Electrode materials 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]