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

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Nano-Micro Letters 2021年第1期13卷 123-137页

作者： Su Hyun Yang Seung‑Keun Park Yun Chan Kang Department of Materials Science and Engineering Korea UniversityAnam‑DongSeongbuk‑GuSeoul 136‑713Republic of Korea Department of Chemical Engineering Kongju National University1223‑24 Cheonan‑daeroSeobuk‑guCheonan 31080Republic of Korea

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 *** 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 *** 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 *** 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 ***,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

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Polar, catalytic, and conductive CoSe2/C frameworks for performance enhanced S cathode in Li–S batteries

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Journal of Energy Chemistry 2020年第9期29卷 128-135,I0004页

作者： Bo Yuan Di Hua Xingxing Gu Yu Shen Li-Chun Xu Xiuyan Li Bing Zheng Jiansheng Wu Weina Zhang Sheng Li Fengwei Huo Key Laboratory of Flexible Electronics(KLOFE) Institute of Advanced Materials(IAM)Nanjing Tech UniversityNanjing 211816JiangsuChina Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Lithium-sulfur battery(Li-S)is considered as one of the new-generation rechargeable batteries with high performance because of its extremely high theoretical capacity,energy density,environmental harmony and low ***,low electrical and ionic conductivity of sulfur,safety concerns and parasitic reaction generated by the dissolved polysulfide species in electrolyte hinder the commercialization of Li-S ***,we report a polyhedral porous structure comprising of carbon coating metal selenide nanoparticles(CoSe2/C),which could not only host sulfur for Li-S battery owing to its porous and conductive structure,but also mitigate the shuttle phenomenon by polysulfides adsorption and catalytic acceleration of redox *** a result,a performance enhanced CoSe2/C-S electrode for Li-S battery is achieved.

关键词： Catalytic Polar Conductive Sulfur cathode cobalt selenides

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