Kyung Hee University · Materials Science
Professor Joonwon Lim's research lab specializes in the design, synthesis, and application of advanced two-dimensional and nanostructured carbon materials for next-generation energy and electronic devices. The lab focuses on atomic-level engineering of graphene and MXene-based materials, with key research directions including controlled unzipping of carbon nanotubes for customized graphene nanostructures, binder-free assembly of MXenes into functional 3D architectures, and the development of flexible, stretchable, and omnidirectionally deformable supercapacitors using rGO, CNTs, and conductive polymers. The lab also explores single-atom catalysts in graphene and field emission properties of CNT cold cathodes, aiming to advance sustainable energy conversion, wearable electronics, and high-resolution imaging technologies.
Figures are computed from collected data and may differ slightly.
Atomic level engineering of graphene-based materials is in high demand to enable customize structures and properties for different applications. Unzipping of the graphene plane is a potential means to this end, but uncontrollable damage of the two-dimensional crystalline framework during harsh unzipping reaction has remained a key challenge. Here we present heteroatom dopant-specific unzipping of carbon nanotubes as a reliable and controllable route to customized intact crystalline graphene-base
An effective pathway to build macroscopic scale functional architectures bearing diverse structural dimensions is one of the critical challenges in the two-dimensional (2D) MXene research area. Unfortunately, assembling MXene without adhesive binder is largely limited due to its innate brittle nature and the relatively weak inter-flake van der Waals contact, in contrast to other mechanically compliant 2D materials such as graphene. Herein, an electrochemical self-assembly of pure Ti<sub>3</sub>C
ConspectusSingle-atomic catalyst (SAC) incorporated in graphene plays an increasingly significant role in many applications, including sustainable energy conversion/storage and environmental systems. Such a synergistic structure commonly consisting of atomic metal active sites stabilized on a robust graphene support, is breaking through the intrinsic limitations of precious-metal-based catalysts and broadening a spectrum of applications, while attaining high atom utilization, remarkable novel ca
We demonstrate a flexible and stretchable supercapacitor assembled via straightforward interfacial gelation of reduced graphene oxide (rGO) with carbon nanotube (CNT) on a stretchable fabric surface. The difference between the redox potential of aqueous graphene oxide (GO) dispersion, prepared using a modified Hummers' method, and of a solid Zn plate, which was used as an external stimulus, induces a spontaneous reduction of GO flakes forming porous CNT-rGO hydrogel at the liquid-solid interface
Omnidirectional deformability is an unavoidable basic requirement for wearable devices to accommodate human daily motion particularly at human joints. We demonstrate omnidirectionally bendable and stretchable textile-based electrochemical capacitor that retains high power performance under complex mechanical deformation. Judicious synergistic hybrid structure of woven elastic polymer yarns with carbon nanotubes and conductive polymers offers reliable electrical and electrochemical activity even
Carbon nanotube (CNT)-based cold cathodes are promising sources of field emission electrons for advanced electron devices, particularly for ultra-high-resolution imaging systems, due to their high brightness and low energy spread. While the electron field emission properties of single-tip CNT cathodes have been intensively studied in the last few decades, a systematic study of the influencing factors on the electron beam properties of CNT cold cathodes and the resolution of the secondary electro
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