A5103080719- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advancements in Solid Oxide Fuel Cells
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Membrane-based Ion Separation Techniques
- Conducting polymers and applications
- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Advanced Battery Materials and Technologies
- Chemical Looping and Thermochemical Processes
- Analytical Chemistry and Sensors
- Analytical Chemistry and Chromatography
- Carbon Dioxide Capture Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Gas Sensing Nanomaterials and Sensors
- Protein purification and stability
- Molten salt chemistry and electrochemical processes
- CO2 Reduction Techniques and Catalysts
- Molecular Junctions and Nanostructures
- Membrane Separation and Gas Transport
- Carbon Nanotubes in Composites
- Advanced Memory and Neural Computing
Korea Institute of Science and Technology
2015-2024
Korea University of Science and Technology
2015-2024
Government of the Republic of Korea
2017-2019
Department of Energy and Environment
2017-2019
Seoul Institute
2018-2019
Linköping University
2018
Kangwon National University
2003-2018
Sungkyunkwan University
2006
Sejong University
2003
Korea Advanced Institute of Science and Technology
1987
Freezing of water in a polymer electrolyte membrane fuel cell (PEMFC) may cause severe problems driving vehicle during the winter time. Characteristics PEMFC which suffered low temperatures below zero celsius were examined with thermal cycles temperature environment chamber was cycled from 80 to With cycles, performance degraded due phase transformation and volume changes water. Effects freezing on electrode structure polarization resistance by Brunauer, Emmett, Teller analysis, cyclic...
Abstract Iron‐ or cobalt‐coordinated heteroatom doped carbons are promising alternatives for Pt‐based cathode catalysts in polymer‐electrolyte fuel cells. Currently, these obtained at high temperatures. The reaction conditions complicate the selective and concentrated formation of metal–nitrogen active sites. Herein a mild procedure is introduced, which conservative toward carbon support leads to active‐site low temperatures wet‐chemical metal‐coordination step. Active‐site imprinted...
Polybenzimidazole (PBI) has been considered as promising membrane material for all-vanadium redox flow batteries (VRFBs) due to its compact morphology that can hinder vanadium crossover. However, 2–4 mS cm−1 proton conductivity remains a challenge achieve high energy efficiency. Recently developed PBI membranes showed up 18 by pre-treatment with phosphoric acid (PA) and 56 KOH. since the operation of VRFB uses sulfuric (SA), different chemicals generates chemical wastes. Here we investigate...
For the practical application of next-generation Li metal batteries (LMBs), a anode with high safety and efficiency is essential. However, LMBs still suffer from problems caused by growth dendrites at anode. In this study, we introduce novel way that could dramatically suppress improve performance LMBs. A free-standing porous hollow carbon nanofiber embedded lithiophilic ZnO nanoparticles ([email protected]) fabricated using dual-nozzle electrospinning technique followed carbonization. The...
Abstract Polybenzimidazole has been widely examined as a separator for vanadium redox flow batteries (VRFBs) due to its low permeability. Its conductivity can be tackled by combining 1–4 µm thin dense PBI layers with highly conductive mechanically supporting layers, either lamination or loose stacking. While gel‐PBI is very soft and conductive, the shadow effect of non‐conductive pore walls porous supports adds resistance. In this work, these issues are addressed coating 25 thick sulfonated...
The structure of proton transport channels is controlled and fixed in sulfonated poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymer membranes. Microphase-separated SBS membranes were cross-linked by UV irradiation the presence a photoinitiator then acetyl sulfate. Sulfonated (scSBS) with nanosized prepared. scSBS show good conductivity, comparable to that Nafion, low methanol permeability, more than 1 order magnitude smaller Nafion. non-cross-linkable...
For the mobile application, performance of polymer electrolyte membrane fuel cells (PEMFCs) should be maintained with being exposed to subzero temperatures in winter time. To simulate situation, a PEMFC was operated at 80°C, stopped, cooled and kept −10°C for 1 h, heated 80°C next operation. With thermal cycle, cell measured found degrade degradation rate 2.3% based on current density voltage 0.6 V. The attributed freezing water that produced during operation remained after prevent...
The impact on the performance of all-vanadium redox flow batteries by tin as an electrocatalyst through <italic>in situ</italic> electrodeposition is investigated.
Abstract We report the feasibility of using reduced graphene oxide (RGO) as a cost-effective and high performance cathode material for sodium-ion batteries (SIBs). Graphene is synthesized by modified Hummers’ method solid-state microwave irradiation method. The RGO electrode delivers an exceptionally stable discharge capacity 240 mAh g −1 with long cycling up to 1000 cycles. A 134 obtained at current density 600 mA , recovers 230 when reset 15 after deep cycling, thus demonstrating excellent...
Abstract Ion conducting membranes play a crucial role in redox flow batteries, separating anolyte and catholyte while allowing proton transport to complete the circuit. However, most are trapped trade‐off relation show either low conductivity or high vanadium crossover. This study investigates use of dense sulfonated para ‐polybenzimidazole for batteries (VRFBs), analyzes effects membrane preparation process, thickness operating temperature on VRFB performance. The results demonstrate...