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828 results on '"Kulesza, Pawel J."'

153. Enantioselective chemisorption on a chirally modified surface in ultrahigh vacuum: adsorption of propylene oxide on 2-butoxide-covered palladium(111)

Author

Stacchiola, Dario, Burkholder, Luke, Tysoe, Wilfred T., Kulesza, Pawel J., Malik, Marcin A., and Murray, Royce W.

Subjects
Chirality -- Usage, Propylene -- Research, Palladium -- Research, Palladium -- Chemical properties, Chemistry
Abstract

The report states that the enantionselective chemisorption of (S)-and (R)-propylene oxide was measured on a Pd(III) surface, which was chirally modified using (S)-and (R)-2 butanol. The reflection - absorption infrared spectroscopic (RAIRS) data suggests that absorbed 2-butanol forms 2-butoxide species, when heated to ~150 K and converts to a ketone with a concomitant loss in chirality at 200 K.

Published
2002

154. Computational exploration of rearrangements related to the vitamin B(sub 12)-dependent ethanolamine ammonia lyase catalyzed transformation

Author

Semialjac, Marija, Schwarz, Helmut, Hicks, Jocelyn F., Kulesza, Pawel J., Malik, Marcin A., and Murray, Royce W.

Subjects
Catalysts -- Usage, Ammonia -- Research, Ammonia -- Atomic properties, Ammonia -- Structure, Chemistry
Abstract

DFT(B3LYP/6-31G(super *) and ab initio molecular orbital theory (QCISD/cc-pVDZ), which is used to investigate several possible mechanisms involving free radical intermediates as well as their protonated forms for processes related to the coenzyme B(sub 12)-dependent rearrangement catalyzed by ethanolamine ammonia lyase is presented.

Published
2002

155. Mechanism of ruthenium-catalyzed olefin metathesis reactions from a theoretical perspective

Author

Cavallo, Luigi, Leopold, Michael C., Hicks, Jocelyn F., Kulesza, Pawel J., Malik, Marcin A., and Murray, Royce W.

Subjects
Catalysts -- Usage, Ruthenium -- Research, Ruthenium -- Chemical properties, Chemistry
Abstract

A density functional theory study of the ruthenium-catalyzed olefin metathesis reactions is presented. It is stated that the calculated insertion barrier for the NHC systems was lower than that of the (PCy(sub 3))(sub 2)Cl(sub 2)Ru=CHPh system.

Published
2002

156. Electron hopping conductivity and vapor sensing properties of flexible network polymer films of metal nanoparticles

Author

Zamborini, Francis P., Leopold, Michael C., Hicks, Jocelyn F., Kulesza, Pawel J., Malik, Marcin A., and Murray, Royce W.

Subjects
Polymers -- Usage, Gold -- Research, Gold -- Electric properties, Chemistry
Abstract

The study was conducted to report the electronic conductivity properties of network polymer films of Au(sub 140) nonoparticles. The film conductivities respond to exposure to organic vapours, decreasing in electronic conductivity and increasing in mass(quartz crystal microgravimetry, QCM).

Published
2002

157. Low-Noble-Metal-Loading Hybrid Catalytic System for Oxygen Reduction Utilizing Reduced-Graphene-Oxide-Supported Platinum Aligned with Carbon-Nanotube-Supported Iridium

Author

Dembinska, Beata, primary, Zlotorowicz, Agnieszka, additional, Modzelewska, Magdalena, additional, Miecznikowski, Krzysztof, additional, Rutkowska, Iwona A., additional, Stobinski, Leszek, additional, Malolepszy, Artur, additional, Krzywiecki, Maciej, additional, Zak, Jerzy, additional, Negro, Enrico, additional, Di Noto, Vito, additional, and Kulesza, Pawel J., additional

Published
2020
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164. Organic/Inorganic Hybrid Electrode Materials for Photo-Conversion of Solar Energy

Author

Jouini, Mohamed, primary, Santoni, Marie-Pierre, additional, Ramanitra, Hasina, additional, Delices, Annette, additional, Xu, Zijun, additional, Dong, Chang-Zhi, additional, Bellynck, Sebastien, additional, Maurel, François, additional, Chevillot, Alexandre, additional, Szaniawska, Ewelina, additional, Wadas, Anna, additional, Rutkowska, Iwona Agnieszka, additional, and Kulesza, Pawel J., additional

Published
2020
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186. Electrochemical charging, countercation accommodation, and spectrochemical identity of microcrystalline solid cobalt hexacyanoferrate

Author

Kulesza, Pawel J., Malik, Marcin A., Berrettoni, Mario, Giorgetti, Marco, Zamponi, Silvia, Schmidt, Roman, and Marassi, Roberto

Subjects
Crystallization -- Research, Cobalt -- Research, Coordination compounds -- Research, Polymer liquid crystals -- Research, Cations -- Research, Chemicals, plastics and rubber industries
Abstract

Research was conducted to analyze microcrystalline solid cobalt hexacyanoferrate using electrochemical, visible spectrophotometric, microgravimetric, and x-ray absorption spectroscopic studies. The CH Instruments model 660 analyzer was utilized to carry out electrochemical measurements while the HP 8452A diode array spectrophotometer was used to record the visible spectra of CoHCNFe. Experimental results indicated that alkali metal countercations are integrated into reduced structures.

Published
1998

187. In situ FT-IR/ATR spectroelectrochemistry of prussian blue in the solid state

Author

Kulesza, Pawel J., Malik, Marcin A., Denca, Andrzej, and Strojek, Jerzy

Subjects
Pigments -- Analysis, Electrochemistry -- Methods, Fourier transform infrared spectroscopy -- Methods, Chemistry
Abstract

Interfacial oxidation and reduction of Prussian Blue (PB), K[Fe.sup.III][[Fe.sup.II][(CN).sub.6]][center dot]n[H.sub.2]O (n [approximately equal to] 10), powder were probed in situ with Fourier transform infrared attenuated total reflection (FT-IR/ATR) spectroscopy. The combination of electrochemistry in the absence of liquid electrolyte with internal reflectance FT-IR spectroscopy was accomplished using a simple two-electrode sandwich-type cell in which a crystalline germanium served both as a working electrode and an infrared transparent element. Application of sufficiently large potential differences to sandwich electrodes led to oxidation and reduction of PB at opposing interfaces. The spectra, which were monitored by difference, clearly show changes in the cyanide stretching frequency range upon oxidation and reduction.

Published
1996

189. Solid-state electroanalysis of silicotungstic acid single crystals at an ultramicrodisk electrode

Author

Kulesza, Pawel J. and Faulkner, Larry R.

Subjects
Tungsten compounds -- Usage, Microelectrodes -- Usage, Electrochemical analysis -- Observations, Chemistry
Abstract

Analyses of rapid redox-conducting molecular solids involve the application of an electroanalytical methodology to their qualitative and quantitative characterization. A group of potential step and cyclic voltammetry methods form the basis of this methodology in which ultramicroelectrodes inside a three-electrode solid-state electrochemical cell are used.

Published
1993

192. Photoelectrochemical Reduction of CO2 at Poly(4‐Vinylpyridine)‐Stabilized Copper(I) Oxide Semiconductor: Feasibility of Interfacial Decoration with Palladium Cocatalyst.

Author

Seta-Wiaderek, Ewelina, Szaniawska, Ewelina, Wadas, Anna, Rutkowska, Iwona A., Jurczakowski, Rafal, Lewera, Adam, Gorzkowski, Maciej, Rajeshwar, Krishnan, and Kulesza, Pawel J.

Subjects
FORMIC acid, PALLADIUM, SEMICONDUCTORS, CARBON monoxide, GLASS electrodes, SEMICONDUCTOR films
Abstract

Poly(4‐vinylpyridine)‐modified copper(I) oxide photocathodes, bare or decorated with palladium nanoparticles, can be used for the visible‐light‐driven selective reduction of CO2, mostly to methanol and carbon monoxide (in the absence of Pd cocatalyst) or formic acid and carbon monoxide (in the presence of Pd cocatalyst). The photocathode materials, which are composed of hierarchically deposited (onto transparent fluorine‐doped conducting glass electrode) Cu2O (inner layer) and poly(4‐vinylpyridine) (P4VP) polyelectrolyte film (outer‐layer), with or without dispersed Pd nanoparticles, have been fabricated and examined using electrochemical methodology, atomic force microscopy, and various spectroscopic techniques, including the Raman approach. While the physicochemical characteristics of Cu2O, including the oxide identity and its semiconducting properties, are not largely affected by the interfacial modification with P4VP, the photostability of the hybrid photocathode is significantly improved. The P4VP‐modified Cu2O exhibits reasonable durability during photoelectrochemical reduction of CO2 upon illumination with sunlight in semi‐neutral medium (Na2SO4). While Cu2O can be identified using Raman spectroscopy as the sole bulk component of the semiconducting film, the XPS data imply that the Cu2O surface is likely to be partially reduced during prolonged operation. Introduction of palladium cocatalyst seems to improve distribution (collection and transport) of photoelectrons at the photoelectrochemical interface and affects the CO2‐electroreduction mechanism. [ABSTRACT FROM AUTHOR]

Published
2021
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195. (Invited) Recent Advances in Electrocatalysts for the Oxygen Reduction Reaction Comprising a Hierarchical Graphene-Based “Core” and a Carbon Nitride “Shell” with a Low Loading of Platinum

Author

Di Noto, Vito, primary, Negro, Enrico, additional, Nale, Angeloclaudio, additional, Kulesza, Pawel J., additional, Rutkowska, Iwona Agnieszka, additional, Bang, Yannick, additional, Vezzù, Keti, additional, Pagot, Gioele, additional, and Pace, Giuseppe, additional

Published
2019
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