Korea University · Engineering
윤찬강 교수의 연구실은 나노구조 전기화학 소재를 중심으로 고성능 리이on 이on 이온 배터리 응용을 위한 신소재 개발에 집중하고 있습니다. 특히 3D 구조를 가진 그래핀, 흑연계 복합체, 요크쉘 구조를 가진 희토류 전이금속 chalcogenide 및 산화물 등 다양한 나노구조를 설계·합성하여 높은 주기 안정성과 빠른 이온·전자 이동성을 확보합니다. 다양한 합성 전략(스프레이 피로리시스, 나노스케일 킴켄달 확산, ZIF 기반 템플릿법 등)을 활용해 전극 재료의 구조적·물리화학적 특성을 정밀 제어합니다.
Figures are computed from collected data and may differ slightly.
A novel anode material for sodium‐ion batteries consisting of 3D graphene microspheres divided into several tens of uniform nanospheres coated with few‐layered MoS 2 by a one‐pot spray pyrolysis process is prepared. The first discharge/charge capacities of the composite microspheres are 797 and 573 mA h g −1 at a current density of 0.2 A g −1 . The 600th discharge capacity of the composite microspheres at a current density of 1.5 A g −1 is 322 mA h g −1 . The Coulombic efficiency during the 600
Double-shelled SnO2 yolk-shell-structured powders are prepared by applying a new facile one-pot process. Carbon-SnO2 composite powder particles are first formed as an intermediate product inside a tubular reactor. Step-by-step combustion of carbon from outside the composite powder particles forms the double-shelled SnO2 yolk-shell-structured powder particles. The SnO2 yolk-shell-structured powders show excellent electrochemical properties. As a service to our authors and readers, this journal pr
Multishell structured metal selenide nanocubes, namely, Co/(NiCo)Se<sub>2</sub> box-in-box structures with different shell compositions, were successfully synthesized by applying zeolitic imidazolate framework-67 (ZIF-67) as a template.
Yolk-shell-structured MoSe₂ microspheres were prepared via a simple selenization process of MoO₃ microspheres. The yolk-shell-structured MoSe₂ and MoO₃ microspheres delivered initial discharge capacities of 527 and 465 mA h g(-1) in the voltage range of 0.001-3 V vs. Na/Na(+) at a current density of 0.2 A g(-1), respectively, and their discharge capacities after 50 cycles were 433 and 141 mA h g(-1), respectively. The yolk-shell-structured MoSe₂ microspheres also exhibited outstanding high rate
Three-dimensional (3D) porous microspheres composed of CoSe<sub>2</sub>@N-doped carbon nanorod-deposited carbon nanotube (CNT) building blocks (CoSe<sub>2</sub>@NC-NR/CNT) can be successfully synthesized using CNT/Co-based metal-organic framework (ZIF-67) porous microspheres as a precursor. This strategy involves the homogeneous coating of ZIF-67 polyhedrons onto porous CNT microspheres prepared by spray pyrolysis and further selenization of the composites under an Ar/H<sub>2</sub> atmosphere. D
Spray-drying and the nanoscale Kirkendall diffusion process are used to prepare nickel sulfide hollow nanospheres/reduced graphene oxide (rGO) composite powders with excellent Na-ion storage properties. Metallic Ni nanopowder-decorated rGO powders, formed as intermediate products, are transformed into composite powders of nickel sulfide hollow nanospheres/rGO with mixed crystal structures of Ni3S2 and Ni9S8 phases by the sulfidation process under H2S gas. Nickel sulfide/rGO composite powders wit
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 CoSe<sub>2</sub> nanocrystal@N-doped carbon matrix confined within HMCSs (denoted as CoSe<sub>2</sub>@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 ze
Layered WS2 nanosheet-decorated three-dimensional reduced graphene oxide (3D-RGO) microspheres are prepared as anode materials for sodium ion batteries. WO3 nanocluster-decorated 3D RGO microspheres are transformed into multi-layered WS2-3D RGO microspheres by a simple sulfidation process. The WS2-3D RGO microspheres show Na(+) storage properties superior to those of the WO3-3D RGO microspheres.
Abstract Despite their high theoretical specific capacity (1675 mA h g −1 ), the practical application of Li–S batteries remains limited because the capacity rapidly degrades through severe dissolution of lithium polysulfide and the rate capability is low because of the low electronic conductivity of sulfur. This paper describes novel hierarchical yolk–shell microspheres comprising 1D bamboo‐like N‐doped carbon nanotubes (CNTs) encapsulating Co nanoparticles (Co@BNCNTs YS microspheres) as effici
Yolk-shell-structured metal sulfide powders are developed for the first time. The yolk-shell SnS powders with a distinctive SnS@void@SnS configuration exhibit superior electrochemical properties for lithium-ion batteries even at high current densities due to their unique structure. The simple two-step process introduced in this manuscript can be applied to the preparation of various types of yolk-shell-structured metal sulfide powders. As a service to our authors and readers, this journal provid
In this work, a facile salt-templated approach is developed for the preparation of hollow FeSe<sub>2</sub> /graphitic carbon composite microspheres as sodium-ion battery anodes; these are composed of interconnected multicavities and an enclosed surface in-plane embedded with uniform hollow FeSe<sub>2</sub> nanoparticles. As the precursor, Fe<sub>2</sub> O<sub>3</sub> /carbon microspheres containing NaCl nanocrystals are obtained using one-pot ultrasonic spray pyrolysis in which inexpensive NaCl
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