Korea University · Engineering
Professor Gi Dae Park's research lab specializes in the design and synthesis of advanced nanomaterials for next-generation energy storage applications, with a primary focus on sodium-ion and other post-lithium-ion batteries. The lab develops novel composite anode materials—particularly metal selenides, oxides, and their heterostructures—using scalable spray pyrolysis and thermally driven transformation processes such as the Kirkendall effect. Key research directions include controlling nanostructure evolution, enhancing electrochemical performance through carbon matrix integration (e.g., rGO and CNTs), and enabling unique hollow or yolk–shell architectures for improved volume stability and ion diffusion.
Figures are computed from collected data and may differ slightly.
Highly porous MoSe<sub>2</sub>-reduced graphene oxide-carbon nanotube (MoSe<sub>2</sub>-rGO-CNT) powders were prepared by a spray pyrolysis process. The synergistic effect of CNTs and rGO resulted in powders containing ultrafine MoSe<sub>2</sub> nanocrystals with a minimal degree of stacking. The initial discharge capacities of MoSe<sub>2</sub>-rGO-CNT, MoSe<sub>2</sub>-CNT, MoSe<sub>2</sub>-rGO, and bare MoSe<sub>2</sub> powders for sodium ion storage were 501.6, 459.7, 460.2, and 364.0 mA h g<
A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium-ion batteries was developed. The detailed mechanism of formation of the CoSe(x)-rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple-structured CoSe(x)-rGO composite powders prepared by spray pyrolysis at 800 °C had a crystal structure consisting mainly of Co0.85 Se with a minor phase of C
A new mechanism for the transformation of nanostructured metal selenides into uniquely structured metal oxides via the Kirkendall effect, which results from the different diffusion rates of metal and Se ions and O 2 gas, is proposed. SnSe nanoplates are selected as the first target material and transformed into SnO 2 hollow nanoplates by the Kirkendall effect. SnSe‐C composite powder, in which SnSe nanoplates are attached or stuck to amorphous carbon microspheres, transforms into several tens of
Abstract As rechargeable battery technology continues to advance, the development of advanced electrode materials is becoming increasingly crucial to meet the emerging demand for electrochemical energy storage devices with higher energy and power densities. However, progress in anode materials has been sluggish and graphite is still widely applied in commercial rechargeable batteries. Alloying and conversion reaction‐based anode materials, including Si, Sn, metal oxides, and metal chalcogenides,
Uniquely structured FeSe(x)-reduced graphene oxide (rGO) composite powders, in which hollow FeSe(x) nanoparticles are uniformly distributed throughout the rGO matrix, were prepared by spray pyrolysis applying the nanoscale Kirkendall diffusion process. Iron oxide-rGO composite powders were transformed into FeSe(x)-rGO composite powders by a two-step post-treatment process. Metallic Fe nanocrystals formed during the first-step post-treatment process were transformed into hollow FeSe(x) nanopartic
SnSe nanoplates with thin and uniform morphology are prepared by one-pot spray pyrolysis, and are examined as anode materials for Na-ion batteries. During the spray pyrolysis process, metallic Se and Sn are prepared from SeO2 and SnO2, respectively, under a reducing atmosphere. Metallic Sn and metalloid Se, with melting points of 232 and 221 °C, respectively, form a melted Sn-Se mixture, which reacts exothermally to form SnSe nanocrystals. Several of these nanocrystals are grown simultaneously f
Highly efficient anode materials with novel compositions for Li-ion batteries are actively being researched. Multicomponent metal selenite is a promising candidate, capable of improving their electrochemical performance through the formation of metal oxide and selenide heterostructure nanocrystals during the first cycle. Here, the binary nickel-cobalt selenite derived from Ni-Co Prussian blue analogs (PBA) is chosen as the first target material: the Ni-Co PBA are selenized and partially oxidized
Unique structured microspheres with multishells comprising graphitic carbon-coated Fe<sub>3</sub>O<sub>4</sub> hollow nanopowders are successfully synthesized as an efficient anode material for lithium-ion batteries
Multicomponent metal oxide hollow-nanosphere decorated reduced graphene oxide (rGO) composite powders are prepared by spray pyrolysis with nanoscale Kirkendall diffusion. The double-layer NiFe2O4@NiO-hollow-nanosphere decorated rGO composite powders are prepared using the first target material. The NiFe-alloy-nanopowder decorated rGO powders are prepared as an intermediate product by post-treatment under the reducing atmosphere of the NiFe2O4/NiO-decorated rGO composite powders obtained by spray
Multicomponent materials with various double cations have been studied as anode materials of lithium-ion batteries (LIBs). Heterostructures formed by coupling different-bandgap nanocrystals enhance the surface reaction kinetics and facilitate charge transport because of the internal electric field at the heterointerface. Accordingly, metal selenites can be considered efficient anode materials of LIBs because they transform into metal selenide and oxide nanocrystals in the first cycle. However, f
Abstract Various metal chalcogenide materials have been investigated as novel candidate anode materials for K‐ion batteries (KIBs). This pioneering study explores the electrochemical reaction between K‐ions and iron telluride. A detailed analysis is performed using in situ and ex situ methods, including X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and cyclic voltammetry (CV), following the initial discharging and charging processes. The
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