Ungyu Paik 교수

Rationally designed FeS₂@carbon yolk–shell nanoboxes exhibit impressive electrochemical performance when evaluated as an anode material for sodium-ion batteries.

Exploring new materials with high efficiency and durability is the major requirement in the field of sustainable energy conversion and storage systems. Numerous techniques have been developed in last three decades to enhance the efficiency of the catalyst systems, control over the composition, structure, surface area, pore size, and moreover morphology of the particles. In this respect, metal organic framework (MOF) derived catalysts are emerged as the finest materials with tunable properties an

Crystalline–amorphous phase boundary engineering can be an effective strategy to develop cost-effective and high-performance electrocatalysts for water splitting.

Sb@C coaxial nanotubes have been designed and synthesized using a facile strategy starting with Sb₂S₃nanorods. The as-obtained Sb@C nanotubes exhibit unprecedented sodium storage properties.

A template-engaged strategy is used to synthesize nanostructured metal phosphides with different compositions. Among the as-synthesized metal phosphides, nickel cobalt phosphides quasi-hollow nanocubes exhibit the best electrocatalytic activity for hydrogen evolution reaction in terms of lower overpotential and smaller Tafel slope in alkaline solution.

This article overviews the recent progress in TiO₂ (i) as an anode material for Li ion batteries and (ii) as a supplemental material in lithium batteries.

An etching-in-a-box strategy is developed to synthesize unique Fe3O4@C yolk-shelled nanocubes. Interestingly, inner cavities are generated in Fe3O4 cores during the etching process. With an optimized etching time of 2 h, an ultralong cycling life is achieved, in which even after 8000 cycles the material can still deliver a significant capacity of 475 mAh g−1 at 10 A g−1. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials

The practical implementation of the lithium metal anode is hindered by obstacles such as Li dendrite growth, large volume changes, and poor lifespan. Here, copper nitride nanowires (Cu₃ N NWs) printed Li by a facile and low-cost roll-press method is reported, to operate in carbonate electrolytes for high-voltage cathode materials. Through one-step roll pressing, Cu₃ N NWs can be conformally printed onto the Li metal surface, and form a Li₃ N@Cu NWs layer on the L

Co3O4 microframes are synthesized through a template-engaged strategy via the etching of Co-Co Prussian blue analogue microcubes with ammonia solution and subsequent annealing treatment. Benefitting from their unique structural merits including 3D open structure and high porosity, these Co3O4 microframes exhibit enhanced electrochemical properties for both lithium-ion batteries and water oxidation.

Transparent ZrO2–polydimethylsiloxane (PDMS) nanocomposites with high refractive index were prepared by dispersing ZrO2nanoparticles in a PDMS matrix via ligand molecule engineering. The ligand molecule consists of a diamine head group that adsorbs strongly onto the ZrO2nanoparticles, and a siloxane tail group with a double-tailed structure that can be easily stretched within the PDMS matrix and yields a greater steric hindrance compared to single-tailed structure. The transmission electron micr

Sb-based materials are promising electrode candidates for rechargeable batteries because of their high electrochemical performance and relatively low cost.

A facile and scalable process for the formation of artificial SEI layer is proposed by roll-press Li metal and fluoropolymer. The layer, composed of lithium fluoride and polymers, plays Li protection for highly stable lithium metal batteries.