A5063790278- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Carbon Nanotubes in Composites
- Extraction and Separation Processes
- Perovskite Materials and Applications
- Conducting polymers and applications
- CO2 Reduction Techniques and Catalysts
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Electron and X-Ray Spectroscopy Techniques
- Graphene research and applications
- Ionic liquids properties and applications
- Machine Learning in Materials Science
- Quantum Dots Synthesis And Properties
- Advanced biosensing and bioanalysis techniques
- Nanowire Synthesis and Applications
- Advanced Biosensing Techniques and Applications
- Chemical Synthesis and Characterization
- Ammonia Synthesis and Nitrogen Reduction
- Covalent Organic Framework Applications
Korea Advanced Institute of Science and Technology
2016-2025
Kootenay Association for Science & Technology
2016-2022
Daejeon University
2019-2021
Government of the Republic of Korea
2019-2021
Battery Park
2020-2021
Yuhan University
2021
RIKEN
2011-2018
The University of Texas at Austin
2015
RIKEN Advanced Science Institute
2012-2013
Massachusetts Institute of Technology
2010-2011
Low electrical efficiency for the lithium-oxygen (Li-O2) electrochemical reaction is one of most significant challenges in current nonaqueous Li-O2 batteries. Here we present ruthenium oxide nanoparticles (RuO2 NPs) dispersed on multiwalled carbon nanotubes (CNTs) as a cathode, which dramatically increase up to 73%. We demonstrate that RuO2 NPs contribute formation poorly crystalline lithium peroxide (Li2O2) coated over CNT with large contact area during oxygen reduction (ORR). This unique...
Non-noble-metal catalysts based on Fe–N–C moieties have shown promising oxygen reduction reaction (ORR) activity in proton exchange membrane fuel cells (PEMFCs). In this study, we report a facile method to prepare catalyst modified graphene (Fe–N–rGO) from heat treatment of mixture Fe salt, graphitic carbon nitride (g-C3N4), and chemically reduced (rGO). The Fe–N–rGO was found pyridinic N-dominant heterocyclic N (40% atomic concentration among all components) the surface an average...
The fast evolution of portable electronic devices and micro-electro-mechanical systems (MEMS) requires multi-functional microscale energy sources that have high power, energy, long cycle life, the adaptability to various substrates. Nanostructured thin-film lithium-ion batteries electrochemical capacitors (ECs) are among most promising storage can meet these demands. This perspective presents an overview recent progresses challenges associated with development binder-free, carbon-based...
Abstract Hierarchical functionalized multiwalled carbon nanotube (MWNT)/graphene structures with thicknesses up to tens of micrometers and relatively high density (>1 g cm −3 ) are synthesized using vacuum filtration for the positive electrode lithium batteries. These electrodes, which self‐standing free binder current collectors, utilize oxygen functional groups Faradaic reactions in addition double‐layer charging, can impart gravimetric (230 Wh kg −1 at 2.6 kW volumetric (450 L 5...
To achieve a high reversibility and long cycle life for lithium-oxygen (Li-O2) batteries, the irreversible formation of Li2O2, inevitable side reactions, poor charge transport at cathode interfaces should be overcome. Here, we report rational design air using cobalt nitride (Co4N) functionalized carbon nanofiber (CNF) membrane as current collector-catalyst integrated cathode. Brush-like Co4N nanorods are uniformly anchored on conductive electrospun CNF papers via hydrothermal growth Co(OH)F...
Lithium-oxygen (Li-O2) batteries have been intensively investigated in recent decades for their utilization electric vehicles. The intrinsic challenges arising from O2 (electro)chemistry mitigated by developing various types of catalysts, porous electrode materials, and stable electrolyte solutions. At the next stage, we face need to reform substituting pure gas with air Earth's atmosphere. Thus, key emerging Li-air batteries, which are related selective filtration suppression undesired...
Abstract Covalent organic frameworks (COFs) have been considered a potentially versatile electrode structure if they are made highly conductive and flexible to stabilize the redox functionality. Although conceptually plausible, COF‐based electrodes rarely satisfied high capacity, cyclability, rate capability thus far. Incorporating thiazole moieties into scaffold, it is able fabricate π‐conjugated crystalline demonstrate fast two‐electron transfer in one step using azo The thiazole‐linked...
The catalytic active sites on metallic Cu are investigated for facilitating nitrate reduction reaction using electrochemical examinations, operando SHINERS, and DFT simulation.
Highly sensitive single-walled carbon nanotube-field effect transistor (SWNT-FET) devices, which detect protein adsorptions and specific protein−protein interactions at 1 pM concentrations, have been achieved. The detection limit has improved 104-fold compared to the devices fabricated by photolithography. substantially increased sensitivity is mainly due Schottky contact area accommodates relatively more numbers of proteins even very low concentration. augmented number adsorbed on a device...
In lithium–oxygen (Li–O2) batteries, it is believed that lithium peroxide (Li2O2) electrochemically forms thin films with thicknesses less than 10 nm resulting in capacity restrictions due to limitations charge transport. Here we show unexpected Li2O2 film growth of ∼60 on a three-dimensional carbon nanotube (CNT) electrode incorporated cerium dioxide (ceria) nanoparticles (CeO2 NPs). The CeO2 NPs favor surface nucleation owing their strong binding toward reactive oxygen species (e.g., O2...
A lithium–iodine (Li–I2) cell using the triiodide/iodide (I3–/I–) redox couple in an aqueous cathode has superior gravimetric and volumetric energy densities (∼ 330 W h kg–1 ∼650 L–1, respectively, from saturated I2 cathode) to reported Li-ion batteries cathode-type batteries, which provides opportunity construct cost-effective high-performance storage. To apply this I3–/I– for a portable compact 3.5 V battery, unlike grid-scale storage as general target of flow we use three-dimensional...
A cathode‐flow lithium‐iodine (Li–I) battery is proposed operating by the triiodide/iodide (I 3 − /I ) redox couple in aqueous solution. The Li–I has noticeably high energy density (≈0.28 kWh kg −1 cell because of considerable solubility LiI solution (≈8.2 m and reasonably power (≈130 mW cm −2 at a current rate 60 mA , 328 K). In operation mode, attains storage capacity (≈90% theoretical capacity), Coulombic efficiency (100% ± 1% 2–20 cycles) cyclic performance (>99% retention for 20 up...
Understanding the lithium-oxygen (Li-O2) electrochemical reaction is of importance to improve kinetics, efficiency, and mitigate parasitic reactions, which links strategy enhanced Li-O2 battery performance. Many in situ ex analyses have been reported address chemical species reduction intermediate products, whereas details dynamic not as yet fully unraveled. For this purpose, visual imaging can provide straightforward evidence, formation decomposition during reaction. Here, we present...
A one‐pot synthesis of three‐dimensional carbon nanotube frameworks with bipyramidal sulfur particles and the application these materials for a cathode in lithium–sulfur (Li–S) battery are reported. By simple mixing multi‐walled nanotubes (MWCNTs), powder, capping agents water/tetrahydrofuran, micrometer enclosed MWCNTs synthesized. The spontaneously form 3D conducting network inside outside particle. Along edge MWCNT framework, particle‐free region is present, which comprises ≈35 vol% based...
We report a novel catalytic reaction to promote oxidation of carbonate and carboxylate species using nanoporous nickel oxide (NiO) in the lithium–oxygen (Li–O2) battery. These NiO catalysts shape two-dimensional (2-D) hexagonal plates are incorporated on carbon nanotube (CNT) electrode, which remarkably enhances efficiency as representative side products Li–O2 electrochemistry greatly improves cycleability more than 70 cycles. The predominantly occurs at NiO, toward may migrate for complete...
The major challenge facing lithium-oxygen batteries is the insulating and bulk lithium peroxide discharge product, which causes sluggish decomposition increasing overpotential during recharge. Here, we demonstrate an improved round-trip efficiency of ~80% by means a mesoporous carbon electrode, directs growth one-dimensional amorphous peroxide. Morphologically, nanostructures with small volume high surface show charge transport promote delithiation (lithium ion dissolution) recharge thus...
Organic electrodes have been extensively developed to enhance cycling performance in aqueous zinc (Zn)-ion cells. However, little is known about an ion-association process, which caused insufficient diagnoses of various cyclability results. Protons (H+) are charge carriers alongside Zn2+ ions mildly acidic electrolyte solutions and preferentially participate the storage process. In addition, dissociation water can supply additional H+, increased pH yields precipitate hydroxy sulfate. Here,...
In lithium oxygen (Li–O2) batteries, controlling the structure of peroxide (Li2O2) can reduce large overpotential charge process as this affects ionic and electronic conductivities Li2O2. We demonstrate, for first time, in situ structural tuning Li2O2 during discharge by virtue surface properties carbon nanotube electrodes. tailored surfaces to decouple functional groups, defective edges, graphitization, which directly influence surface-binding affinity O2 LiO2. Consequently, conformal...
In lithium–oxygen (Li–O2) batteries, nanocatalysts have been widely employed as a means to suppress the large recharge overpotential and possibly improve cyclability. However, these studies consistently mired with ambiguity relating possible exacerbation of side reactions, which in turn has brought into question role such catalysts Li–O2 cells. Here, we shed light on viability by examining use Ru, Pt, Pd, Co3O4, Au nanoparticles supported carbon nanotubes We show that while there can be...
Optimizing synthesis parameters is crucial in fabricating an ideal cathode material; however, the design space too vast to be fully explored using Edisonian approach. Here, by clustering eleven domain-expert-derived-descriptors from literature, we use inverse surrogate model build up experimental parameters-property relationship. Without struggling with trial-and-error method, enables variables prediction that serves as effective strategy for retrosynthesis. More importantly, not only did...
F-free, cost-effective 1 M NaBH 4 /glyme electrolytes induce SEI reconstruction, which converts the native oxide layer on sodium metal to a NaH-based layer. With /DEGDME, we achieved long-term cycling, high-power seawater batteries.