Korea University · Energy
이 교수의 연구실은 나노구조 물질을 중심으로 한 에너지 변환 및 저장 소재의 설계와 응용을 주요 연구 분야로 삼고 있습니다. 특히, 희토류가 아닌 금속 인산화물, 계면활성 이odic 화합물, 게르마늄 계열 나노소재 등을 활용한 고효율 수소발생 반응 촉매 및 리이온 이차전지 음극재 개발에 집중하고 있으며, 2차원 물질의 이방성 전기적·광전성질을 제어하는 데에도 성공하고 있습니다. 연구는 나노재료의 조성 제어, 구조 제어, 그리고 전기화학적 성능 향상에 초점을 맞추고 있습니다.
Figures are computed from collected data and may differ slightly.
We report achieving of efficient electrocatalytic hydrogen evolution reaction using composition-controlled iron phosphide (FeP and FeP2) nanowires. The respective Tafel slopes of nanowire arrays were 39 and 37 mV dec(-1) in 0.5 M H2SO4, and 75 and 67 mV dec(-1) in 1 M KOH. The richer P composition produced excellent electrocatalytic efficiency.
Two-dimensional ReSe<sub>2</sub> has emerged as a promising electrocatalyst for the hydrogen evolution reaction (HER), but its catalytic activity needs to be further improved. Herein, we synthesized Re<sub>1-<i>x</i></sub>Mo<i><sub>x</sub></i>Se<sub>2</sub> alloy nanosheets with the whole range of <i>x</i> (0-100%) using a hydrothermal reaction. The phase evolved in the order of 1T″ (triclinic) → 1T' (monoclinic) → 2H (hexagonal) upon increasing <i>x</i>. In the nanosheets with <i>x</i> = 10%, t
Germanium sulfide (GeS and GeS2) nanoparticles were synthesized by novel gas-phase laser photolysis and subsequent thermal annealing. They showed excellent cycling performance for lithium ion batteries, with a maximum capacity of 1010 mA h g(-1) after 100 cycles. Metastable tetragonal phase Ge nanoparticles were suggested as active materials for a reversible lithium insertion-extraction process.
Recently, extensive efforts have been directed at finding novel 2D-layered structures with anisotropic crystal structures. Herein, the in-plane anisotropic optical and (photo)electrical properties of 2D SiAs nanosheets synthesized using a solid-state reaction and subsequent mechanical exfoliation are reported. The angle-resolved polarized Raman spectrum shows high in-plane anisotropy of the phonon vibration modes, which are consistent with the theoretical prediction. Field-effect transistor devi
Germanium-tin (Ge(1-x)Sn(x)) alloy nanocrystals were synthesized using a gas-phase laser photolysis reaction of tetramethyl germanium and tetramethyl tin. A composition tuning was achieved using the partial pressure of precursors in a closed reactor. For x < 0.1, cubic phase alloy nanocrystals were exclusively produced without separation of the tetragonal phase Sn metal. In the range of x = 0.1-0.4, unique Ge(1-x)Sn(x)-Sn alloy-metal hetero-junction nanocrystals were synthesized, where the Sn me
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