Minju Chung

Direct electrochemical propylene epoxidation by means of water-oxidation intermediates presents a sustainable alternative to existing routes that involve hazardous chlorine or peroxide reagents. We report an oxidized palladium-platinum alloy catalyst (PdPtO x /C), which reaches a Faradaic efficiency of 66 ± 5% toward propylene epoxidation at 50 milliamperes per square centimeter at ambient temperature and pressure. Embedding platinum into the palladium oxide crystal structure stabilized oxidized

Chlorine as a redox mediator allows for the selective oxidation of ethylene to 2-chloroethanol, which converts to ethylene oxide in alkaline aqueous electrolyte. This strategy utilizes abundant saline water as an electrolyte and source of oxygen atoms for functionalization. We present a mechanistic study of ethylene oxidation in saline water using cobalt oxide nanoparticle catalysts. Electrochemical kinetic analysis and in situ X-ray absorption spectroscopy suggest that the resting state of the

Selective and efficient electrocatalysts are imperative for the successful deployment of electrochemistry toward synthetic applications. In this study, we used galvanic replacement reactions to synthesize iridium-decorated manganese oxide nanoparticles, which showed a cyclooctene epoxidation partial current density of 10.5 2.8 mA/cm 2 and a Faradaic efficiency of 46 4%. Results from operando X-ray absorption spectroscopy suggest that manganese leaching from the nanoparticles during galvanic repl

C NMR spectroscopy. The resulting high sulfur content (≥50 wt%) polymers exhibited tensile strength at break in the range of 10-60 MPa (70-50 wt% sulfur), which represents an unprecedentedly high strength for high sulfur content polymers from vulcanization. The resulting high sulfur content copolymer also exhibited extraordinary shape memory behavior along with shape reprogrammability attributed to facile polysulfide bond rearrangement.

High Resolution Image Download MS PowerPoint Slide Electric fields that form spontaneously at catalytic solid–liquid interfaces reflect the kinetics of surface reactions, coverage of reactive intermediates, and the nature of the microenvironments that encompass active sites. The measurement of these fields via the electrode potential of the catalyst and their interpretation can reveal mechanistic features of reactions that are not accessible by other methods. Here, the aqueous phase aerobic oxid

High Resolution Image Download MS PowerPoint Slide Electrochemical reduction of carbon dioxide (CO 2 ) is a promising route to up-convert this industrial byproduct. However, to perform this reaction with a small-molecule catalyst, the catalyst must be proximal to an electrode surface. Efforts to immobilize molecular catalysts on electrodes have been stymied by the need to optimize the immobilization chemistries on a case-by-case basis. Taking inspiration from nature, we applied DNA as a molecula

The thermodynamic activity of a reacting species, rather than the concentration of that species, generally determines the rate of a kinetically-limited reaction. In this work we demonstrate the need for the explicit accounting of reacting species’ thermodynamic activities in solution, especially when conducting electrochemical kinetic tests. In hydrogen evolution in an alkaline acetonitrile-water blended electrolyte as well as previously-reported oxygen-atom transfer reactions (cyclooctene epoxi

Ammonia is one of the largest volume commodity chemicals, and electrochemical routes to ammonia utilization are appealing due to increasingly available renewable electricity. In this work, we demonstrate an electrochemical analogue to reductive amination for the synthesis of benzylamine from benzaldehyde and ammonia. Previous works on electrochemical reductive amination generally focus on proof-of-concept outer-sphere routes. We demonstrate an inner-sphere route, opening a large phase space of h

in setting the coverages of reactive intermediates and the ensuing impacts on rates during redox thermocatalysis.

Metal particle-size effects in heterogeneous catalysis are commonly interpreted in geometric terms, where catalytic trends arise from variations in the density of active surface ensembles while the intrinsic properties of the sites are generally assumed to remain unchanged. Here we demonstrate that metal particle size also governs the intrinsic properties of active sites via size-dependent electronic promotion, beyond conventional geometric effects. Using well-defined Ru catalysts supported on m

Data including DFT outputs, NMR peak areas, currents, voltages, etc. as well as some analysis.