Mihye Wu 교수

Due to the growing demand for high energy density devices, Li-O₂ batteries are considered as a next generation energy storage system. The battery performance is highly dependent on the Li₂O₂ morphology, which arises from formation pathways such as the surface growth and the solution growth models. Thus, controlling the formation pathway is important in designing cathode materials. Herein for the first time, we controlled the Li₂O₂ formation

Spatial control of lithium deposition is the most important issue in lithium‐metal batteries because of the considerable control of lithium dendrite suppression via the uniform distribution of Li + flux. Although seed materials are crucial for the behavior of lithium deposition, in‐depth studies on their physical and chemical control have not been conducted. Here, we describe a new design of seed structure comprising a wrinkled Cu/graphene substrate surrounded by copper(I) oxide (Cu 2 O) on a gr

A composite of hydrous amorphous RuO₂ nanoparticles as a catalyst, and reduced graphene oxide (rGO) as a catalyst support were combined and developed as a cathode material for non-aqueous Li–O₂ batteries for the first time.

Uniform lithium deposition is essential to hinder dendritic growth. Achieving this demands even seed material distribution across the electrode, posing challenges in correlating the electrode's surface structure with the uniformity of seed material distribution. In this study, the effect of periodic surface and facet orientation on seed distribution is investigated using a model system consisting of a wrinkled copper (Cu)/graphene structure with a [100] facet orientation. A new methodology is de

Macroporous polymers have gained significant attention due to their unique mass transport and size-selective properties. In this study, we focused on Polyimide (PI), a high-performance polymer, as an ideal candidate for macroporous structures. Despite various attempts to create macroporous PI (Macro PI) using emulsion templates, challenges remained, including limited chemical diversity and poor control over pore size and porosity. To address these issues, we systematically investigated the role

The composite of amorphous RuO₂ as an electrocatalyst and aluminum-doped ZnO (AZO) as a cathode material was synthesised and developed into a carbon-free cathode material for Li–O₂ batteries <italic>via</italic> an <italic>in situ</italic> microwave-assisted hydrothermal method.

Amorphous TiO₂supported crystalline RuO₂(a-TiO₂/c-RuO₂hybrid) enhanced battery performance, and this enhancement was attributed to the crystallinity of the TiO₂that amorphous TiO₂is more electrochemically active toward ORR/OER than crystalline TiO₂.

Highly loaded Au nanoseeds (∼ 65 wt%) without aggregation by introducing highly defective substrate and carbothermalshock method showed high stability inhibiting Li dendrite growh in Li-metal batteries.

Mesoporous amorphous binary Ru-Ti oxides were prepared as bifunctional catalysts for non-aqueous Li-O₂ batteries, and their electrochemical performance was investigated for the first time. A Li-O₂ battery with mesoporous amorphous binary Ru-Ti oxides exhibited a remarkably high capacity of 27100 mAh g^-1 as well as a reduced overpotential. A GITT analysis suggested that the introduction of amorphous TiO₂ to amorphous RuO₂ was responsible for

The selection and design of catalysts are key factors in determining the performance of lithium–oxygen (Li–O2) batteries. Among a diverse selection of catalysts, platinum (Pt) is attracting attention as it possesses superior catalytic activity in both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in comparison to other catalysts. Catalytic activity is influenced by various factors related to catalytic active sites, such as the surface area and grain size. Until now, the

The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu³⁺-doped YVO₄ nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu³⁺-doped nanocrystalline YVO₄ under low