A5090780564- 2D Materials and Applications
- Electrocatalysts for Energy Conversion
- Metal-Organic Frameworks: Synthesis and Applications
- MXene and MAX Phase Materials
- Material Dynamics and Properties
- nanoparticles nucleation surface interactions
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Theoretical and Computational Physics
- Metallic Glasses and Amorphous Alloys
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Metal and Thin Film Mechanics
- Phase-change materials and chalcogenides
- Graphene research and applications
- Perovskite Materials and Applications
- Advancements in Battery Materials
- Nuclear Materials and Properties
- Polyoxometalates: Synthesis and Applications
- Quasicrystal Structures and Properties
- Advanced ceramic materials synthesis
- Molecular Sensors and Ion Detection
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
University of Oregon
2022-2024
Jeonju University
2018-2022
Government of the Republic of Korea
2018-2020
Jeonbuk National University
2019
Northwestern Polytechnical University
2015-2018
Zhejiang University
2013-2017
Institute of New Materials
2014-2017
China XD Group (China)
2016
Two-dimensional MoSe2 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 nanosheets synthesized using hydrothermal reaction, displaying much enhanced HER performance at Se/Mo ratio of 2.3. The transition from 2H 1T′ phase occurred exceeded 2. Structural analysis revealed presence Se adatoms well formation Se–Se bonding. Based on first-principles calculations, propose two...
2D MoS2 nanostructures have recently attracted considerable attention because of their outstanding electrocatalytic properties. The synthesis unique Co-Ru-MoS2 hybrid nanosheets with excellent catalytic activity toward overall water splitting in alkaline solution is reported. 1T' phase are doped homogeneously Co atoms and decorated Ru nanoparticles. performance hydrogen evolution reaction (HER) oxygen (OER) characterized by low overpotentials 52 308 mV at 10 mA cm-2 Tafel slopes 55 50...
Two-dimensional ReSe2 has emerged as a promising electrocatalyst for the hydrogen evolution reaction (HER), but its catalytic activity needs to be further improved. Herein, we synthesized Re1–xMoxSe2 alloy nanosheets with whole range of x (0–100%) using hydrothermal reaction. The phase evolved in order 1T″ (triclinic) → 1T′ (monoclinic) 2H (hexagonal) upon increasing x. In = 10%, substitutional Mo atoms tended aggregate Se vacancies. incorporation makes more metallic than end compositions....
Earth-abundant transition metal dichalcogenide nanosheets have emerged as an excellent catalyst for electrochemical water splitting to generate H2. Alloying the with heteroatoms is a promising strategy enhance their catalytic performance. Herein, we synthesized hexagonal (2H) phase Mo1–xNbxSe2 over whole composition range using solvothermal reaction. results in variety of atomic-scale crystal defects such Se vacancies, and adatoms. The defect content maximized when x approaches 0.5. Detailed...
Two-dimensional GeP nanosheets were synthesized to probe the thickness-dependent band gap and electrical properties, which supported by first-principles calculations that predicted of monolayers be 2.3 eV.
Alloys of transition-metal dichalcogenide can display distinctive phase evolution because their two-dimensional structures. Herein, we report the colloidal synthesis Mo1–xVxSe2 alloy nanosheets with full composition tuning. Alloying led to a transition at x = 0.7 from semiconducting 2H MoSe2 metallic 1T VSe2. It also produced significant V and Se vacancies, which became richest in 0.3–0.5. Extensive spin-polarized density functional theory calculations consistently predicted 2H–1T 0.7,...
Polytypes of two-dimensional transition metal dichalcogenide can extend the architecture and application nanostructures. Herein, Nb1-xVxSe2 alloy nanosheets in full composition range (x) were synthesized by a colloidal reaction. At x = 0.1-0.3, phase occurred from various hexagonal (three 2H one 4H types) NbSe2 to an atomically homogeneous 1T VSe2. Density functional theory calculations also revealed polytypic at 0.3, which was shifted close 0 presence Se vacancies. Furthermore, validate...
The distribution of carbon vacancies has a great effect on Pugh's ratio interstitial carbides.
Zn–In bimetallic nanocrystals exhibit excellent selectivity for electrochemical CO<sub>2</sub>reduction to HCOOH, whose efficiency is greatly enhanced with 5% In composition.
Thermally regenerative electrochemical cycles and thermogalvanic cells harness redox entropy changes (ΔSrc) to interconvert heat electricity with applications in harvesting energy storage. Their efficiencies depend on ΔSrc because it relates directly the Seebeck coefficient, yet few approaches exist for controlling reaction entropy. Here, we demonstrate design principle of using highly charged molecular species as electrolytes devices. As a proof-of-concept, Wells-Dawson ion [P2W18O62]6–...
We report nitrogen-rich 1T′ phase MoS<sub>2</sub> layered nanostructures using different alkyl amines as intercalants, with first-principles calculations.
2D hybrid nanostructures consisting of 1T′ phase MoS<sub>2</sub> and Fe-phthalocyanine molecules exhibit excellent catalytic activity toward both the hydrogen evolution reaction oxygen reduction reaction.
Anisotropic atomic distribution of Re<sub>1−x</sub>Mo<sub>x</sub>S<sub>2</sub> alloy nanosheets enhanced their electrocatalytic performance toward the hydrogen evolution reaction.
Redox intercalation involves coupled ion-electron motion within host materials, finding extensive application in energy storage, electrocatalysis, sensing, and optoelectronics. Monodisperse MOF nanocrystals, compared to their bulk phases, exhibit accelerated mass transport kinetics that promote redox inside nanoconfined pores. However, nanosizing MOFs significantly increases external surface-to-volume ratios, making the chemistry into nanocrystals difficult understand due challenge of...
Compared to dense analogues, high-surface-area metals offer several key advantages in electrocatalysis and energy storage. Of the porous manifolds, metal-organic frameworks (MOFs) boast highest known surface area of any material class, a subset also conduct electricity. The premier conductive scaffolds, Ni3(HITP)2 Ni3(HIB)2, are both predicted be metallic, but experiments have yet measure bulk metallicity. In this paper, we explore thermodynamics hydrogen vacancies interstitials demonstrate...
As promising candidates for anode materials in lithium ion batteries (LIB), two-dimensional tungsten disulfide (WS2) and WS2@(N-doped) graphite composites were synthesized, their electrochemical properties comprehensibly studied conjunction with calculations. The WS2 nanosheets, WS2@graphite, WS2@N-doped (N-graphite) exhibit outstanding cycling performance capacities of 633, 780, 963 mA h g–1, respectively. To understand storage mechanism, first-principles calculations involving a series ab...
Anion sensing technology is motivated by the widespread and critical roles played anions in biological systems environment. Electrochemical approaches comprise a major portion of this field but so far have relied on redox-active molecules appended to electrodes that often lack ability produce mixtures distinct signatures from different anions. Here, nanocrystalline films conductive metal–organic framework (MOF) Cr(1,2,3-triazolate)2 are used differentiate based size, which consequently...
We performed a systematic study of the adsorption behaviors O2 and NO gas molecules on pristine MoS2, N-doped, P-doped MoS2 monolayers via first principle calculations. Our energy calculations charge analysis showed that interactions between P-MoS2 system are stronger than N-MoS2. The spin absorbed molecule couples differently depending type adsorbed P- N-substituted monolayer. Meanwhile, leaves N- magnetic semiconductor, whereas an turns this into nonmagnetic which may provide some helpful...
We study crystal nucleation in metallic niobium supercooled liquid by ab initio molecular dynamics simulations. Using various structural analysis methods including bond orientational order analysis, a scheme of crystallization process is revealed. Extended structured regions high are spontaneously formed state thermal fluctuations. This mainly has bcc-type local symmetry, but small portion hcp-type symmetry. Since these act as precursors for crystallization, homogeneous takes place quite...