| 첨부 '1' |
|---|
| author | Kwangyeol Lee |
|---|---|
| journal | small methods |
| Homepage | http://nanolab.korea.ac.kr/ |
Designing an efficient and durable electrocatalyst for the sluggish oxygen evolution reaction (OER) at the anode remains the foremost challenge in developing proton exchange membrane (PEM) electrolyzers. Here we report a highly active and durable cactus-like nanoparticle with an exposed heterointerface between the IrO2 and the low oxidation state Ru by introducing a trace amount of Mn dopant. The heterostructure fabrication relies on initial mixing of the Ru and Ir phases before electrochemical oxidation to produce a conjoined Ru/IrO2 heterointerface. Benefitting from electron transfer at the heterointerface, the low oxidation state Ru species showed excellent initial activity, which was maintained even after 180 hours of continuous OER test. In a half-cell test, the Mn-doped RuIr nanocactus (Mn-RuIr NCT) achieved a mass activity of 1.85 A mgIr+Ru-1 at 1.48 VRHE, which is 139-fold higher than that of commercial IrO2. Moreover, the superior electrocatalytic performance of Mn-RuIr NCT in the PEM electrolysis system ensures its viability in practical uses. The results of the excellent catalytic performance for acidic OER indicate that the heterostructuring robust rutile IrO2 and the highly active Ru species with a low oxidation state on the catalyst surface drive a synergistic effect.
https://onlinelibrary.wiley.com/doi/10.1002/smtd.202101236
-
Read More
Resonant Raman-Active Polymer Dot Barcodes for Multiplex Cell Mapping
Resonance Raman spectroscopy is an efficient tool for multiplex imaging because of the narrow bandwidth of the electronically enhanced vibrational signals. However, Raman signals are often overwhelmed by concurrent fluorescence. In this stud... -
Read More
Decoding the Roles of Amyloid-β (1-42)'s Key Oligomerization Domains toward Designing Epitope-Specific Aggregation Inhibitors
Fibrillar amyloid aggregates are the pathological hallmarks of multiple neurodegenerative diseases. The amyloid-β (1-42) protein, in particular, is a major component of senile plaques in the brains of patients with Alzheimer’s di... -
Read More
Flattening bent Janus nanodiscs expands lattice parameters
Nanoscale lattice parameter engineering is a potentially powerful tool for tailoring the electronic properties of nanomaterials. The nascent strain in juxtaposed hetero-interfaces of nanocrystals was recently shown to substantially affect t... -
Read More
Directing the surface atomic geometry on copper sulfide for enhanced electrochemical nitrogen reduction
Understanding catalytic-conversion determinants will blueprint an efficient electrocatalyst design for electrochemical nitrogen reduction. In metal chalcogenide-based catalysts, metal-site nitrogen adsorption initiates nitrogen fixation, an... -
Read More
High Seebeck Coefficient Achieved by Multinuclear Organometallic Molecular Junctions
This paper describes thermoelectric property of molecular junctions incorporating multinuclear ruthenium alkynyl complexes that comprise Ru(dppe)2 (dppe = 1,2-bis(diphenylphosphino)ethane) fragments and diethylnyl aromatic bridging ligands ... -
Read More
Thermopower in Transition from Tunneling to Hopping
The Seebeck effect of molecular junction in a hopping regime or tunneling-to-hopping transition remains uncertain. This paper describes the Seebeck effect in molecular epitaxy films (OPIn where n = 1 – 9) based on imine condensation b... -
Read More
An Activity-Based Fluorescent Probe for Imaging Fluctuations of Peroxynitrite (ONOO-) in the Alzheimer's Disease Brain
Peroxynitrite (ONOO-) plays a critical role in Alzheimer's disease (AD), and the association between ONOO- and AD is inexplicit. To reveal the ONOO- influxes in AD brains, an activatable activity-based fluorescence probe Rd-DPA3 was rat... -
Read More
Deep learning for development of organic optoelectronic devices: Efficient prescreening of hosts and emitters in deep-blue fluorescent OLEDs
The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies, which are key factors in optoelectronic devices, must be accurately estimated for newly designed materials. Here, we developed a deep lea... -
Read More
Photocatalytic Superoxide Radical Generator that Induces Pyroptosis in Cancer Cells
In this study, we show that a photocatalytic superoxide radical (O2−•) generator, NI-TA, triggers pyroptosis in cancer cells. NI-TA was designed to take advantage of an intramolecular triplet-ground state splitting energy modulat... -
Read More
Direct C–H metallation of tetrahydrofuran and application in flow
The direct C–H metallation of tetrahydrofuran (THF) to generate α-anionic THF is one of the most straightforward methods for the the generation and utilization of α-anionic THF. Here we develop a reaction for the direct me... -
Read More
Functionalization of Diamine-Appended MOF-Based Adsorbents by Ring Opening of Epoxide: Long-Term Stability and CO2 Recyclability under Humid Conditions
Although diamine-appended metal-organic framework (MOF) adsorbents exhibit excellent CO2 adsorption performance, a continuous decrease in long-term capacity during repeated wet cycles remains a formidable challenge for practical application... -
Read More
High Gravimetric and Volumetric Ammonia Capacities in Robust Metal–Organic Frameworks Prepared via Double Postsynthetic Modification
Ammonia is a promising energy vector that can store the high energy density of hydrogen. For this reason, numerous adsorbents have been investigated as ammonia storage materials, but ammonia adsorbents with a high gravimetric/volumetric amm... -
Read More
Li-ion Intercalation, Rectification, and Solid Electrolyte Interphase in Molecular Tunnel Junctions
This paper describes Li-ion intercalation into pyrenyl terminated self-assembled monolayer (SAM) on gold, inspired from graphite anode in Li-ion battery, and its effect on tunneling performance in molecular junction incorporating the SAM. A... -
Read More
Thermopower of Molecular Junction in Harsh Thermal Environments
Molecular junctions can be miniaturized devices for heat-to-electricity conversion application, yet these operate only in mild thermal environments (less than 323 K) because thiol, the most widely used anchor moiety for chemisorption of act... -
Read More
Microfluidics-Assisted Synthesis of Hierarchical Cu2O Nanocrystal as C2-Selective CO2 Reduction Electrocatalyst
Copper-based catalysts have attracted enormous attention due to their high selectivity for C2+ products during the electrochemical reduction of CO2 (CO2RR). In particular, grain boundaries on the catalysts contribute to the generation of va... -
Read More
Chemical Fields: Directing Atom Migration in the Multiphasic Nanocrystal
Atoms in a bulk solid phase are usually trapped to fixed positions and can change their position only under certain conditions (e.g., at a melting point) due to the high energy barrier of migration between positions within the crystal latti... -
Read More
Electronic Mechanism of In Situ Inversion of Rectification Polarity in Supramolecular Engineered Monolayer
This paper describes polarity inversion in molecular rectification and the related mechanism. Using supramolecular engineered, ultrastable binary mixed self-assembled monolayer (SAM) composed of organic molecular diode (SC11BIPY) and inert ... -
Read More
Direct observation of protein structural transitions through entire amyloid aggregation processes in water using 2D-IR spectroscopy
Amyloid proteins that undergo self-assembly to form insoluble fibrillar aggregates have attracted much attention due to their role in biological and pathological significance in amyloidosis. This study aims to understand the amyloid aggrega... -
Read More
Harnessing GLUT1-Targeted Pro-oxidant Ascorbate for Synergistic Phototherapeutics
Despite extensive efforts to realize effective photodynamic therapy (PDT), there is still a lack of therapeutic approaches concisely structured to mitigate the major obstacles of PDT in clinical applications. Herein, we report a molecular s... -
Read More
DNA-Damage-Response-Targeting Mitochondria-Activated Multifunctional Prodrug Strategy for Self-Defensive Tumor Therapy
We report a novel multifunctional construct, M1, designed explicitly to target the DNA damage response in cancer cells. M1 contains both a floxuridine (FUDR) and protein phosphatase 2A (PP2A) inhibitor combined with a GSH-sensitive linker. ...