고려대학교 · 에너지
이 교수의 연구실은 2차원 전이금속 디 chalcogenide(TMD) 나노소재를 중심으로 전기화학적 수소 생산을 위한 고효율 촉매 개발에 집중하고 있습니다. 특히, 비희토류 전이금속을 기반으로 한 나노소재의 합성, 상전이 제어, 결함 구조 설계 및 다원소 도핑을 통해 수소발생반응(HER)과 산소발생반응(OER)의 촉매 성능을 극대화하는 데 초점을 맞추고 있습니다. 다양한 합금화 및 표면 기능화 전략을 통해 전도성과 촉매 활성도를 동시에 향상시키는 기초 및 응용 연구를 진행하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Two-dimensional MoSe<sub>2</sub> has emerged as a promising electrocatalyst for the hydrogen evolution reaction (HER), although its catalytic activity needs to be further improved. Herein, we report Se-rich MoSe<sub>2</sub> nanosheets synthesized using a hydrothermal reaction, displaying much enhanced HER performance at the Se/Mo ratio of 2.3. The transition from the 2H to the 1T' phase occurred as Se/Mo exceeded 2. Structural analysis revealed the presence of Se adatoms as well as the formation
2D MoS<sub>2</sub> nanostructures have recently attracted considerable attention because of their outstanding electrocatalytic properties. The synthesis of unique Co-Ru-MoS<sub>2</sub> hybrid nanosheets with excellent catalytic activity toward overall water splitting in alkaline solution is reported. 1T' phase MoS<sub>2</sub> nanosheets are doped homogeneously with Co atoms and decorated with Ru nanoparticles. The catalytic performance of hydrogen evolution reaction (HER) and oxygen evolution re
Two-dimensional Re dichalcogenide nanostructures are promising electrocatalysts for the hydrogen evolution reaction (HER). Herein, we report the adatom doping of various transition metals (TM = Mn, Fe, Co, Ni, and Cu) in ReSe<sub>2</sub> nanosheets synthesized using a solvothermal reaction. As the atomic number of TM increases from Mn to Cu, the adatoms on Re sites become more favored over the substitution. In the case of Ni, the fraction of adatoms reaches 90%. Ni doping resulted in the most ef
Earth-abundant transition metal dichalcogenide nanosheets have emerged as an excellent catalyst for electrochemical water splitting to generate H<sub>2</sub>. Alloying the nanosheets with heteroatoms is a promising strategy to enhance their catalytic performance. Herein, we synthesized hexagonal (2H) phase Mo<sub>1-<i>x</i></sub>Nb<sub><i>x</i></sub>Se<sub>2</sub> nanosheets over the whole composition range using a solvothermal reaction. Alloying results in a variety of atomic-scale crystal defe
Alloying of transition metal dichalcogenides (TMDs) is a pioneering method for engineering electronic structures with expanded applications. In this study, MoSe<sub>2</sub> -VSe<sub>2</sub> -NbSe<sub>2</sub> ternary alloy nanosheets are synthesized via a colloidal reaction. The composition is successfully tuned over a wide range to adjust the 2H-1T phase transition. The alloy nanosheets consist of miscible atomic structures at all compositions, which is distinct from immiscible binary alloys. Co
Alloys of transition-metal dichalcogenide can display distinctive phase evolution because of their two-dimensional structures. Herein, we report the colloidal synthesis of Mo1–xVxSe2 alloy nanosheets with full composition tuning. Alloying led to a phase transition at x = 0.7 from the semiconducting 2H phase MoSe2 to the metallic 1T phase VSe2. It also produced significant V and Se vacancies, which became the richest in the 2H phase at x = 0.3–0.5. Extensive spin-polarized density functional theo
It is challenging to control the electronic structure of 2D transition metal dichalcogenides (TMD) for extended applications in renewable energy devices. Here, ReSe<sub>2</sub>-VSe<sub>2</sub> (Re<sub>1-</sub> <sub>x</sub>V<sub>x</sub>Se<sub>2</sub>) alloy nanosheets over the whole composition range via a colloidal reaction is synthesized. Increasing x makes the nanosheets more metallic and induces a 1T″-to-1T phase transition at x = 0.5-0.6. Compared to the MoSe<sub>2</sub>-VSe<sub>2</sub> and
Ternary alloying of transition metal dichalcogenides (TMDs) has the potential for altering the electronic structure of materials to suit electrochemical applications. Herein, we synthesized (MoWV)Se<sub>2</sub> nanosheets at various compositions <i>via</i> a colloidal reaction. The mole fraction of V atoms (<i>x</i><sub>V</sub>) was successfully increased up to 0.8, producing a metallic phase that is highly durable against hydration. Furthermore, we synthesized (MoW)Se<sub>2</sub> nanosheets ove
Tuning the electronic structures of transition metal dichalcogenides (TMD) is essential for their implementation in next-generation energy technologies. In this study, we synthesized composition-tuned WSe<sub>2</sub>-VSe<sub>2</sub> (W<sub>1-<i>x</i></sub>V<sub><i>x</i></sub>Se<sub>2</sub>, <i>x</i> = 0-1) alloyed nanosheets using a colloidal reaction. Alloying the semiconducting WSe<sub>2</sub> with VSe<sub>2</sub> converts the material into a metallic one, followed by a 2H-to-1T phase transiti
The phase control of transition metal dichalcogenides (TMDs) is an intriguing approach for tuning the electronic structure toward extensive applications. In this study, WSe<sub>2</sub> nanosheets synthesized via a colloidal reaction exhibit a phase conversion from semiconducting 2H to metallic 2M under Se-rich growth conditions (i.e., increasing the concentration of Se precursor or lowering the growth temperature). High-resolution scanning transmission electron microscopy images are used to iden
Abstract Modulating the electronic structure of transition metal dichalcogenides (TMDs) via alloying is challenging despite the additional potential applications. In this study, a solvothermal reaction is used to synthesize composition‐tuned ReS 2 –VS 2 (Re 1‐ x V x S 2 ) alloy nanosheets featuring an expanded interlayer distance. Increasing x induces a phase transition from the semiconducting 1T″ phase ReS 2 to the metallic 3R‐stacking 1T phase VS 2 . Alloying via homogeneous atomic mixing rend
Abstract The novel two‐dimensional nanostructures of transition metal dichalcogenides (TMDs) have motivated extensive studies on the control of electronic structures via sandwiching of foreign species. Herein, we review our recent works on TMD nanosheets that intercalated with various molecules (i.e., amine, cobaltocene, porphyrin, phthalocyanine, etc.). They were mainly synthesized by a one‐step solvothermal reaction. The intercalation expanded the interlayer spacing significantly and induced t
The CO 2 hydrogenation reaction is a promising route for mitigating greenhouse gas emissions by converting CO 2 into value-added carbon monoxide through the reverse water–gas shift (RWGS) process. In this study, a surfactant-assisted mechanochemical synthesis was developed to prepare highly dispersed Cu catalysts supported on MgCeO x for the RWGS reaction. The combined use of CTAB (Hexadecyltrimethylammonium bromide, C 19 H 42 BrN) and Span®60 (Sorbitan monostearate, C 24 H 46 O 6 ) enabled simu
