A5088819492- Covalent Organic Framework Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Graphene research and applications
- Fuel Cells and Related Materials
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Advancements in Battery Materials
- Membrane Separation and Gas Transport
- Luminescence and Fluorescent Materials
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Advanced battery technologies research
- Ammonia Synthesis and Nitrogen Reduction
- MXene and MAX Phase Materials
- Advanced Sensor and Energy Harvesting Materials
- Machine Learning in Materials Science
- Hydrogen Storage and Materials
- Synthesis and properties of polymers
- Advanced Battery Materials and Technologies
- Graphene and Nanomaterials Applications
- Catalysis and Hydrodesulfurization Studies
- Fiber-reinforced polymer composites
Dartmouth College
2023-2025
Dartmouth Hospital
2025
Ulsan National Institute of Science and Technology
2018-2024
Sungkyunkwan University
2022
King Abdullah University of Science and Technology
2022
Pohang University of Science and Technology
2022
Government of the Republic of Korea
2020
Single atomic copper doping in ultrathin nitrogenated carbon nanosheets over 20.9 wt% was achieved, greatly boosting the oxygen reduction catalysis.
Developing efficient and stable electrocatalysts is crucial for the electrochemical production of pure clean hydrogen. For practical applications, an economical facile method producing catalysts hydrogen evolution reaction (HER) essential. Here, we report ruthenium (Ru) nanoparticles uniformly deposited on multi-walled carbon nanotubes (MWCNTs) as HER catalyst. The catalyst exhibits small overpotentials 13 17 mV at a current density 10 mA cm
Abstract There have been extensive efforts to synthesize crystalline covalent triazine‐based frameworks (CTFs) for practical applications and realize their potential. The phosphorus pentoxide (P 2 O 5 )‐catalyzed direct condensation of aromatic amide instead nitrile form triazine rings. P ‐catalyzed was applied on terephthalamide construct a framework ( p CTF‐1). This approach yielded highly CTF‐1 with high specific surface area (2034.1 m g −1 ). At low pressure, the showed CO (21.9 wt % at...
Catalysts are at the heart of hydrogen evolution reaction (HER) for production pure and clean hydrogen. For practical applications, scalable synthesis efficient HER catalysts, which work in both acidic alkaline media, is highly desired. In this work, mechanochemically assisted a Ru catalyst with performance surpassing Pt media reported. Mass can be achieved via two-step procedure: mechanochemical between graphite dry ice produces edge-carboxylic-acid-functionalized graphene nanoplatelets...
Abstract Hydrogen adsorption/desorption behavior plays a key role in hydrogen evolution reaction (HER) catalysis. The HER rate is trade-off between adsorption and desorption on the catalyst surface. Herein, we report rational balancing of by orbital modulation using introduced environmental electronegative carbon/nitrogen (C/N) atoms. Theoretical calculations reveal that empty d orbitals iridium (Ir) sites can be reduced interactions C/N Ir This balances around sites, accelerating related...
Tuning the metal-support interaction of supported metal catalysts has been found to be most effective approach modulating electronic structure and improving catalytic performance. But practical understanding charge transfer mechanism at level catalysis process remained elusive. Here, it is reported that ruthenium (Ru) nanoparticles can self-accommodate into Fe3 O4 carbon support (Ru-Fe3 /C) through interaction, resulting in robust activity toward alkaline hydrogen evolution reaction (HER)....
Covalent organic frameworks (COFs) have emerged as a promising platform for photocatalysts. Their crystalline porous nature allows comprehensive mechanistic studies of photocatalysis, which revealed that their general photophysical parameters, such light absorption ability, electronic band structure, and charge separation efficiency, can be conveniently tailored by structural modifications. However, further understanding the relationship between structure-property-activity is required from...
Abstract Practical application of triboelectric nanogenerators (TENGs) has been challenging, particularly, under harsh environmental conditions. This work proposes a novel 3D‐fused aromatic ladder (FAL) structure as tribo‐positive material for TENGs, to address these challenges. The 3D‐FAL offers unique materials engineering platform tailored properties, such high specific surface area and porosity, good thermal mechanical stability, tunable electronic properties. fabricated 3D‐FAL‐based...
Abstract Developing efficient and cost‐effective electrocatalysts to replace expensive carbon‐supported platinum nanoparticles for the alkaline hydrogen evolution reaction remains an important challenge. Recently, innovative catalyst, composed of ruthenium single atoms (Ru 1 ) integrated with small Ru nanoclusters NC ), has attracted considerable attention from scientific community. However, because its complexity, this catalyst a topic some debate. Here, method is reported precisely...
Abstract Developing efficient and durable electrocatalysts is key to optimizing the electrocatalytic hydrogen evolution reaction (HER), currently one of cleanest most sustainable routes for producing hydrogen. Here, a unique approach fabricate embed uniformly dispersed Ir nanoparticles in 3D cage‐like organic network (CON) structure reported. These trapped within CON (Ir@CON) effectively catalyze HER process. The Ir@CON electrocatalyst exhibits high turnover frequencies 0.66 0.20 H 2 s −1 at...
Efficiently converting unstable linkages into stable is an important objective in the chemistry of covalent organic frameworks (COFs), because it enhances stability and preserves crystallinity. Here, imine-linked COF was converted a aromatic benzoxazole-linked (BO-COF) via post-oxidative cyclization, based on used to form fused-aromatic ladder-like rigid-rod polymers. The structure porous BO-COF confirmed by transmission electron microscopy, infrared solid-state nuclear magnetic resonance...
Abstract Identification of active sites is one the main obstacles to rational design catalysts for diverse applications. Fundamental insight into identification structure and structural contributions catalytic performance are still lacking. Recently, X-ray absorption spectroscopy (XAS) density functional theory (DFT) provide important tools disclose electronic, geometric natures sites. Herein, we demonstrate Zn-N 2 with both experimental/theoretical near edge (XANES) extended fine (EXAFS)...
Abstract Single atom catalysts (SACs) are of great importance for oxygen reduction, a critical process in renewable energy technologies. The catalytic performance SACs largely depends on the structure their active sites, but explorations highly structures SAC sites still limited. Herein, we demonstrate combined experimental and theoretical study reduction catalysis SACs, which incorporate M−N 3 C 1 site structure, composed atomically dispersed transition metals (e.g., Fe, Co, Cu)...
Covalent organic frameworks have recently shown high potential for photocatalytic hydrogen production. However, their structure-property-activity relationship has not been sufficiently explored to identify a research direction structural design. Herein, we report the design and synthesis of four benzotrithiophene (BTT)-based covalent (COFs) with different conjugations building units, activity All BTT-COFs had slipped parallel stacking patterns crystallinity specific surface areas. The change...
Developing covalent organic frameworks (COFs) with good electrical conductivity is essential to widen their range of practical applications. Thermal annealing known be a facile approach for enhancing conductivity. However, at higher temperatures, most COFs undergo amorphization and/or thermal degradation because the lack linker rigidity and physicochemical stability. Here, we report synthesis conductive benzoxazole-linked COF/carbon hybrid material (BCOF-600C) by simple annealing. The...
The physical and photochemical properties of covalent organic frameworks (COFs) can be tuned by their structural features such as the chemical composition conjugation building units. combination units with different intrinsic also influence electronic, adsorption, optical properties. For study on symmetrical feature COF its physical/photochemical properties, we prepared benzothiazole-based COFs (TTzTp BTzTp) two combinations, composed tris-benzothiazole triamine (TTz) or bis-benzothiazole...
Ordered two-dimensional covalent organic frameworks (COFs) have generally been synthesized using reversible reactions. It has difficult to synthesize a similar degree of ordered COFs irreversible Developing with fused aromatic ring system via an reaction is highly desirable but remained significant challenge. Here we demonstrate COF that can be from building blocks condensation (aromatization). The as-synthesized robust (F-COF) exhibits high crystallinity. Its lattice structure characterized...
Single atom catalysts (SACs) with isolated active sites exhibit the highest reported mass activity for hydrogen evolution catalysis, which is crucial practical applications. Here, we demonstrate that ultrahigh can also be achieved by rationally merging platinum (Pt) in SAC. The catalyst was obtained thermodynamically driven diffusing and phosphorus-doped carbon (PC) supported Pt single atoms (Pt1@PC) into nanoclusters (PtM@PC). X-ray absorption spectroscopy analysis revealed merged much...
Abstract A novel synthesis strategy is demonstrated to prepare Mo 3 P/Mo nanobelts with porous structure for the first time. The growth and formation mechanism of nanobelt was disclosed by varying contents H 2 /PH reaction temperature. During hydrogen evolution (HER) catalysis, optimized exhibited a small overpotential 78 mV at current density 10 mA cm −2 low Tafel slope 43 dec −1 , as well long‐term stability in alkaline media, surpassing Pt wire. Density functional theory (DFT)...
Abstract Planar two-dimensional (2D) layered materials such as graphene, metal-organic frameworks, and covalent-organic frameworks are attracting enormous interest in the scientific community because of their unique properties potential applications. One common feature these is that building blocks (monomers) flat lie planar 2D structures, with interlayer π–π stacking, parallel to stacking direction. Due layer-to-layer confinement, segmental motion very restricted, which affects...