A5019982160- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Conducting polymers and applications
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- Advanced Memory and Neural Computing
- Hybrid Renewable Energy Systems
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- High-Temperature Coating Behaviors
- Advanced Battery Technologies Research
- Corrosion Behavior and Inhibition
- Catalysis and Hydrodesulfurization Studies
- Semiconductor materials and devices
Korea Advanced Institute of Science and Technology
2018-2024
Iron- and nitrogen-doped carbon (Fe–N–C) materials have been suggested as the most promising replacement for Pt-based catalysts in oxygen reduction reaction (ORR) owing to FeN4 active moiety. Based on relationship between binding energy catalytic activity, Fe–N–C has a very strong energy; hence, hard desorb final intermediate of *OH. Herein, we provide an effective method tuning moiety using phosphine-gas treatment Fe–N–C. Combined analyses experimental computational results reveal that...
Exploring highly efficient platinum single-atom (Pt1) catalysts for oxygen reduction reaction (ORR) is desired to greatly reduce the costs of polymer electrolyte membrane (PEM) fuel cells. Herein, based on a nitrogen-doped active carbon (N-doped Black Pearl, NBP), an atomically dispersed Pt-based electrocatalyst first prepared via hydrothermal ethanol method with Pt content about 5 wt % (Pt1/NBP), and it shows high selectivity two-electron pathway. Through further high-temperature pyrolysis,...
A Pt 3 Mn intermetallic ORR electrocatalyst was synthesized using a facile synthesis without additional multi-steps, and exhibits superior single-cell performance durability.
Corrosion of carbon support is one the most crucial causes degradation polymer electrolyte membrane fuel cells (PEMFCs) utilizing carbon-supported platinum nanoparticles (Pt/C) as a catalyst. To mitigate corrosion, Pt alloyed with iridium (Ir), which catalytically active for oxygen evolution reaction (OER), various compositions PtxIry. The PtxIry alloy catalysts (PtxIry/C) show slightly lower initial activity reduction (ORR) than Pt/C. However, ORR activities PtxIry/C increase repeating...
PtNi octahedral nanoparticles are considered as one of the best-performing catalysts for oxygen reduction reaction (ORR). However, Ni dissolution deteriorates their catalytic activity and stability during ORR. Here, we report a strategy that improves ORR nanoparticle catalyst through incorporation novel dopant. Computational screening with seven different elements (Bi, In, Ru, Sn, Te, Zn, Zr) suggests In most promising candidate based on metal doping energy OH* adsorption energy....
Cost reduction and long-term durability are crucial issues for the commercialization of polymer electrolyte membrane fuel cells. To accomplish these goals, herein, we report an electrospun iron nitrogen codoped mesoporous carbon nanofiber (Fe-N-MCNF) use as both a low-cost nonprecious metal catalyst durable support platinum nanoparticles. Silica nanoparticles polyvinyl acetate used together porogens to create mesopores. As synergetic effect two types porogens, numerous mesopores successfully...
The chemical coupling of molybdenum carbide (Mo 2 C) to cobalt (Co) promotes oxygen evolution reaction (OER) kinetics on the Co surface by making more electrophilic. Here, gain a deeper understanding effects electrophilic properties OER and obtain high activity, Fe Ni are additionally incorporated into nanoparticles that coupled with Mo C (Co‐Mo C). Considering oxidation states (Fe 3+ ), (Co 2+ /Co (Ni ) ions, expected affect electronic structure in opposite direction. Lewis acidic doping...
In order to improve the electrocatalytic activity and stability of an iridium (Ir) nanoparticle catalyst toward oxygen evolution reaction (OER) in acidic electrolyte, carbon nanotube titanium dioxide nanocomposites (CNT@TiO2) are presented as a high-performance support. TiO2 was synthesized on CNTs by using novel layer-by-layer solution coating method that mimics atomic layer deposition (ALD) but is cost-effective scalable. nanocomposites, serve electron pathways surface layers protect from...
The sluggish oxygen reduction reaction (ORR) kinetics has inhibited the widespread commercialization of polymer electrolyte membrane fuel cells (PEMFCs). Therefore, there been a great need for catalysts that promote ORR. PtCo intermetallic nanoparticles supported on conductive carbon, which have superior activity and durability toward ORR, considered promising cathode in PEMFCs. In general, high-temperature annealing is required to synthesize catalysts, accompanies sintering nanoparticles,...
Despite the superior catalytic activity of ordered Pt-M nanoparticles for oxygen reduction reaction (ORR), challenges such as particle growth during ordering transformation and insufficient durability over extended operation hinder their application in polymer electrolyte membrane fuel cells (PEMFCs). In this study, a zeolitic imidazolate framework-8 (ZIF-8) is pyrolyzed into zinc nitrogen-doped carbon (ZnNC). Pt are synthesized on ZnNC underwent heat treatment, transforming PtZn (O-PtZn)....
Platinum (Pt) has been preferred as the most viable catalytic material to accelerate sluggish oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) 1,2 . However, scarcity of Pt on earth makes it expensive, resulting a concomitantly high cost for commercial implementation cells. In this respect, significant efforts have made worldwide reduce loading while retaining and even improving their performance Pt-based ORR electrocatalysts 3,4 One effective approaches...
Extensive commercialization of polymer electrolyte membrane fuel cells (PEMFCs) is restricted by high price Pt which commonly used to promote the oxygen reduction reaction (ORR). Therefore, reducing dosage in ORR catalysts while maintaining activity and stability important key for accelerating PEMFCs’ commercialization. In this study, Zn-introduced PtCo intermetallic nanoparticles supported on Zn-NC substrate (Zn-PtCo/Zn-NC) were synthesized, demonstrating superior durability toward acidic...
Herein, we investigated the potential of downsizing Pt nanoparticles to single atom scale as a strategy improve utilization efficiency in electrocatalysts. We focused on catalysts anchored high-surface area N-doped carbon [1-3] , which have shown higher oxygen reduction reaction (ORR) activity than nano-catalysts fuel cell applications. However, contribution achieving these results has been questioned, and selectivity SACs for ORR is still controversial. prepared different types...
In order to overcome the disadvantage of intermittent production renewable energy, Polymer electrolyte membrane water electrolysis(PEMWE), which is one technologies producing hydrogen by electrolyzing water, attracting attention. For commercialization PEMWE, it important reduce usage iridium(Ir) for oxygen evolution reaction(OER) in anode electrode. Many studies have been reported amount iridium used developing a catalyst with higher performance than nanoparticle as commercial catalyst. As...
Polymer electrolyte membrane fuel cells (PEMFCs) are energy conversion devices that change chemical into electric energy. PEMFCs have high power density and efficiency wiht no pollution due to hydrogen as a [1]. However, their cost low stability hindered from full-commercialization. This issue is originated large amount of noble platinum catalyst in the cathode electrode overcome sluggish oxygen reduction reaction (ORR) [2]. To increase ORR activity with small Pt, Pt-M alloy (M: Fe, Ni, Co,...
Polymer electrolyte membrane fuel cell (PEMFC) is a promising energy conversion system to replace the conventional power generators operating on fossil fuels. In PEMFC, there are two main reactions; oxygen reduction reaction (ORR) at cathode and hydrogen oxidation (HOR) anode. Theoretical equilibrium voltage of PEMFC 1.23 V, but actual PEMFCs produce lower voltages mostly due slow kinetics ORR. order increase rate, Pt catalyst used in PEMFC. Moreover, electric vehicle (FCEV), durability Pt/C...
Commercialization of polymer electrolyte membrane fuel cells (PEMFCs) requires a dramatic reduction in the price catalysts, which account for significant portion total cost. Therefore, since most catalysts PEMFCs are present cathode where oxygen reaction (ORR) occurs, it is necessary to ensure sufficient durability after and activity ORR. In this work, using metal-organic framework (MOF)-based carbon supports, platinum (Pt) were converted into platinum-zinc (Pt-Zn) intermetallic enhance...
Polymer electrolyte membrane water electrolysis (PEMWE) is an energy conversion device for producing green hydrogen, which one of the key elements moving toward a hydrogen society. However, there are two obstacles to commercialization PEMWE, cost and durability. In particular, large amount noble metal catalyst such as ruthenium (Ru) or iridium (Ir) required oxygen evolution reaction (OER) occurring at anode electrode. To reduce usage catalysts, carbon supports could be introduced. due harsh...
Iron- and nitrogen-doped carbon (Fe-N-C) materials have been suggested as the most promising replacement for Pt-based catalysts in oxygen reduction reaction (ORR) owing to FeN 4 active moiety. Based on relationship between binding energy catalytic activity, Fe-N-C has very strong so that hard desorb final intermediate of *OH. Herein, we provide first time an effective method tuning moiety using a phosphine gas-phase treatment Fe-N-C. Combined analyses experimental computational results...
The degradation of PEMFC is a very complex phenomenon and affected by various factors. Among the components PEMFC, an electrode composed carbon-supported platinum nanoparticle catalyst (Pt/C) plays important role in determining durability PEMFC. Typically, PEMFCs have operating voltage range 0.5–1.0V. During long-term operation under these conditions, Pt nanoparticles agglomerate, reducing active surface area gradually performance. On other hand, abnormal conditions such as low fuel...