AbstractAbstract
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Original Title
Adsorpcja kwasu octowego (znakowanego 14C i trytem) na elektrodzie platynowej
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Source
Jubilee scientific convention of Polish Chemical Society and Association of Chemical Industry Engineers and Technicians; Wroclaw, Poland; 12 - 15 Sep 1979; Published in summary form only.
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Journal Article
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Conference
Journal
Prace Naukowe Instytutu Chemii Organicznej i Fizycznej Politechniki Wroclawskiej. Seria Konferencje; ISSN 0324-9824; ; (no.18); p. 349
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Zelenay, P.; Wieckowski, A.
American Chemical Society, 1991 Joint Central-Great Lakes Regional Meeting1991
American Chemical Society, 1991 Joint Central-Great Lakes Regional Meeting1991
AbstractAbstract
[en] Anionic adsorption on platinum and rhodium surfaces of different crystallographic orientations was studied by radioactive labelling technique and cyclic voltammetry. The free Gibbs energy of adsorption and the energy of lateral interaction of anions adsorbed on well-defined and disordered electrodes were calculated using the Bennes isotherm. It was shown that surface order generally leads to the increased amount of anions absorbed and affects substantially the potential dependence of adsorption. An electrocatalytic specificity of rhodium electrodes of different surface crystallography with respect of perchlorate reduction and chloride adsorption was found in a study performed on Rh(100), Rh(111) and polycrystalline Rh
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Anon; 237 p; 1991; p. 53; American Chemical Society; Washington, DC (United States); 23. central regional meeting; Indianapolis, IN (United States); 29-31 May 1991; 24. Great Lakes regional meeting of the American Chemical Society (ACS); Indianapolis, IN (United States); 29-31 May 1991; CONF-9105267--; American Chemical Society, 1155 16th Street, NW, Washington, DC 20036 (United States)
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Book
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Conference
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BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CATALYSTS, CHARGED PARTICLES, CHEMICAL REACTIONS, CHLORINE COMPOUNDS, CRYSTALS, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, ENERGY, HALOGEN COMPOUNDS, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, IONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, METALS, MINUTES LIVING RADIOISOTOPES, NUCLEI, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PLATINUM METALS, RADIOISOTOPES, RHODIUM ISOTOPES, SECONDS LIVING RADIOISOTOPES, SORPTION, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENTS
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Wieckowski, A.; Krauskopf, E.K.; Rice, L.M.; Zelenay, P.
50th Anniversary 1938/1988: Division of Analytical Chemistry newsletter, Spring 19891989
50th Anniversary 1938/1988: Division of Analytical Chemistry newsletter, Spring 19891989
AbstractAbstract
[en] Well-defined electrodes used in the in situ mode of operation should be ultra-high vacuum tested with respect to the surface symmetry and order. In the single-crystal program in their laboratory, they use Pt(111) electrode which is characterized by LEED/Auger spectroscopy and they exploit surface chemistry of iodine to preserve the proper surface crystallography in solution. Radiochemical measurements with such a prepared electrode will be reported and the career of iodine chemisorbed on platinum and other single-crystals of metals will be scrutinized. They will also present the most recent data obtained with single crystals of rhodium and with polycrystalline gold. Adsorption of pyridine and bisulfate anions on the gold electrode by radio-electrochemistry will be described and compared with equivalent measurements on platinum. Some preliminary radiochemical data with Au(111) may also be reported
Source
Anon; 93 p; 1989; p. 77-78; American Chemical Society; Washington, DC (USA); Kendall Award symposium on microstructural probes of electrode processes honoring Arthur T. Hubbard; Dallas, TX (USA); 9-14 Apr 1989; CONF-8904149--; American Chemical Society, Division of Analytical Chemistry, 1155 16th Street, NW Washington, DC 20036
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Book
Literature Type
Conference; Numerical Data
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AZINES, CHEMICAL REACTIONS, CHEMISTRY, COHERENT SCATTERING, CRYSTALS, DATA, DIFFRACTION, ELECTRON SPECTROSCOPY, ELEMENTS, HALOGENS, HETEROCYCLIC COMPOUNDS, INFORMATION, METALS, NONMETALS, NUMERICAL DATA, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, PLATINUM METALS, SCATTERING, SEPARATION PROCESSES, SPECTROSCOPY, TRANSITION ELEMENTS
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AbstractAbstract
[en] Adsorption of pyridine on smooth polycrystalline gold was studied by the use of the radioactive-labeling method and electrochemistry. The adsorption is reversible and, in the range of the structural uniformity of the adsorbate, characterized by the standard Gibbs energy of adsorption of 30 kJ mol-1. Weak repulsive interactions between vertically adsorbed pyridine molecules were found. At low bulk concentrations of the adsorbate, a horizontally oriented pyridine occupies the surface and rearranges to the vertical form with the increase in the electrode potential. The contrasting cases of pyridine adsorption on gold from acidic and neutral solution and differences encountered in bonding of pyridine by polycrystalline gold and platinum are discussed
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Journal Article
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Numerical Data
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AZINES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON ISOTOPES, CHEMICAL ANALYSIS, CRYSTALS, DATA, ELEMENTS, EVEN-EVEN NUCLEI, HETEROCYCLIC COMPOUNDS, INFORMATION, ISOTOPES, LIGHT NUCLEI, METALS, NUCLEI, NUMERICAL DATA, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, QUANTITATIVE CHEMICAL ANALYSIS, RADIOISOTOPES, TRANSITION ELEMENTS, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] 'Full text': The high cost of precious metals used in the conventional Polymer Electrolyte Membrane (PEM) fuel cells, as well as catalyst degradation over long periods of use, poses a tremendous challenge to PEM fuel cell development. Non-precious metal catalysts as an inexpensive substitute for platinum have been viewed as the only long-term solution to the problem. In this paper, polypyrrole-carbon nanoparticles core-shell structure based nanocomposites were synthesized successfully by in situ chemical deposition of polypyrrole in an aqueous suspension of carbon black nanoparticles. Transition metal ions such as Fe and Co ions were immobilized into a polypyrrole shell by coordination of Fe and Co ions with four nitrogens with the Fe-N4 and Co-N4 structure. Highly active carbon nanocomposite catalysts for oxygen reduction in PEMFCs were developed through the pyrolysis of Transition metal-Polypyrrole (PPy)-Carbon nanocomposite at different temperatures (500, 600, 700, 800, 900 and 1000 oC). The Transition metal-PPy-Carbon nanocomposite pyrolyzed at 900oC displays the best electrocatalytic activity and selectivity for four-electron reduction of O2, and the catalyst showed high stability against degradation after use for hundreds of hours. The rotating disk (RDE) onset and half-wave potential (E1/2) of oxygen reduction were measured at 0.88 V and 0.75 V, respectively. Rotating ring-disk electrode (RRDE) study revealed very good selectivity in the fourelectron reduction, with H2O2 yields below 2%. The PEM fuel cell exhibited a current density as high as 0.23 A cm-2 at 0.6 V for a catalyst loading of 6.0 mg cm-2. Less than 5% performance degradation was observed over hundreds of hours at a constant voltage of 0.4 V. (author)
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Univ. of Ontario Inst. of Technology (UOIT), Oshawa, Ontario (Canada); 23.4 Megabytes; ISBN 0-9781236-1-1; ; 2009; [1 p.]; ICH2P-09: International Conference on Hydrogen Production 2009; Oshawa, Ontario (Canada); 3-6 May 2009; Available in abstract form only, full text entered in this record; Available from University of Ontario Institute of Technology (UOIT), Oshawa, Ontario (Canada)
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Miscellaneous
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Conference
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[en] This paper reports that by using a radioactive labeling method and electrochemistry, results were obtained that show that interactions of bisulfate anion with well-ordered single-crystal electrodes are different from those with the polycrystalline electrodes. In particular, the anion surface concentration on the polycrystalline rhodium electrode increases monotonically with the electrode potential and then decreases when the surface becomes electrooxidized. With Rh(111), the surface stability of bisulfate is observed in a broad electrode potential range. Likewise, the hydrogen adsorption process apparently overcomes a higher energy barrier to nucleate into surface water-bisulfate network on Rh(111) than it does on the polycrystalline surface. These findings, and the corresponding results obtained with platinum electrodes, demonstrate some unique electrochemical properties of electrode materials that have a regular atomic periodicity and a long-range crystallographic order. extension of this work to surfaces covered by underpotential-deposited-metal (UPD) adlayers illustrates the principles of enhanced absorption
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Journal Article
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