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Artículos de revistas sobre el tema "Platinum (111)"

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Publicado: 11 de marzo de 2023

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1

Fecher, G. H., J. Bansmann, Ch Grünewald, A. Oelsner, Ch Ostertag y G. Schönhense. "Oxidation of rubidium at platinum (111)". Surface Science 307-309 (abril de 1994): 70–75. http://dx.doi.org/10.1016/0039-6028(94)90372-7.

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2

Kern, Klaus, Rudolf David, Robert L. Palmer, George Comsa y Talat S. Rahman. "Surface phonon dispersion of platinum (111)". Physical Review B 33, n.º 6 (15 de marzo de 1986): 4334–37. http://dx.doi.org/10.1103/physrevb.33.4334.

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3

Maurice, Vincent y Christian Minot. "Theoretical investigation of the mechanisms for olefinic hydrogenation on platinum(110) and platinum(111) surfaces". Journal of Physical Chemistry 94, n.º 23 (noviembre de 1990): 8579–88. http://dx.doi.org/10.1021/j100386a018.

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4

Jo, Sam K. y John M. White. "Correlation of photoelectron yields and photodissociation rates of chloromethane on platinum(111) and carbon-covered platinum(111)". Journal of Physical Chemistry 94, n.º 17 (agosto de 1990): 6852–54. http://dx.doi.org/10.1021/j100380a057.

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5

Komine, Nobuyuki, Tomoko Ishiwata, Jun-ya Kasahara, Erino Matsumoto, Masafumi Hirano y Sanshiro Komiya. "Synthesis and organic group transfer of organodiplatinum complex with a 1,2-bis(diphenylphosphino)ethane ligand". Canadian Journal of Chemistry 87, n.º 1 (1 de enero de 2009): 176–82. http://dx.doi.org/10.1139/v08-111.

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A series of homometallic alkyl- and phenyldinuclear complexes containing one platinum–platinum bond, (dppe)RPt–Pt(η5-Cp)(CO) (R = Me, Et, CH2CMe3, Ph), have been prepared by oxidative addition of the Pt–C bond of PtR(η5-Cp) to Pt(styrene)(dppe), and were characterized by spectroscopic methods and (or) X-ray structure analysis. The geometry at Pt with a dppe ligand is square planar, and the carbonyl and Cp ligand of the Pt(η5-Cp)(CO) moiety lie orthogonal to the coordination plane of former platinum. Competitive organic group transfer reactions along the Pt–Pt bond in these complexes took place to give PtR(η5-Cp)(CO) and PtR(η1-Cp)(dppe) on thermolysis. Alkyl or aryl transfer from Pt with a dppe ligand were enhanced by addition of olefin, whereas treatment with CO and tertiary phosphine ligands causes Cp transfer from Pt(η5-Cp)(CO).Key words: organoplatinum–platinum complex, organic group transfer.

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6

Garbe, J. y J. Kirschner. "Spin-dependent photoemission intensities from platinum (111)". Physical Review B 39, n.º 14 (15 de mayo de 1989): 9859–64. http://dx.doi.org/10.1103/physrevb.39.9859.

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7

Jiang, L. Q. y Bruce E. Koel. "Hydrocarbon trapping and condensation on platinum (111)". Journal of Physical Chemistry 96, n.º 22 (octubre de 1992): 8694–97. http://dx.doi.org/10.1021/j100201a008.

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8

Diebold, Ulrike, Lanping Zhang, John F. Anderson y Pawel Mrozek. "Surface segregation of silicon in platinum(111)". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 14, n.º 3 (mayo de 1996): 1679–83. http://dx.doi.org/10.1116/1.580318.

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9

Tachibana, Takeshi, Yoshihiro Yokota, Koichi Miyata, Takashi Onishi, Koji Kobashi, Masayoshi Tarutani, Yoshizo Takai, Ryuichi Shimizu y Yoshihiro Shintani. "Diamond films heteroepitaxially grown on platinum (111)". Physical Review B 56, n.º 24 (15 de diciembre de 1997): 15967–81. http://dx.doi.org/10.1103/physrevb.56.15967.

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10

Tachibana, Takeshi, Yoshihiro Yokota, Koichi Miyata, Koji Kobashi y Yoshihiro Shintani. "Heteroepitaxial diamond growth process on platinum (111)". Diamond and Related Materials 6, n.º 2-4 (marzo de 1997): 266–71. http://dx.doi.org/10.1016/s0925-9635(96)00733-9.

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11

Arulmozhi, Nakkiran, Thomas J. P. Hersbach y Marc T. M. Koper. "Nanoscale morphological evolution of monocrystalline Pt surfaces during cathodic corrosion". Proceedings of the National Academy of Sciences 117, n.º 51 (7 de diciembre de 2020): 32267–77. http://dx.doi.org/10.1073/pnas.2017086117.

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This paper studies the cathodic corrosion of a spherical single crystal of platinum in an aqueous alkaline electrolyte, to map out the detailed facet dependence of the corrosion structures forming during this still largely unexplored electrochemical phenomenon. We find that anisotropic corrosion of the platinum electrode takes place in different stages. Initially, corrosion etch pits are formed, which reflect the local symmetry of the surface: square pits on (100) facets, triangular pits on (111) facets, and rectangular pits on (110) facets. We hypothesize that these etch pits are formed through a ternary metal hydride corrosion intermediate. In contrast to anodic corrosion, the (111) facet corrodes the fastest, and the (110) facet corrodes the slowest. For cathodic corrosion on the (100) facet and on higher-index surfaces close to the (100) plane, the etch pit destabilizes in a second growth stage, by etching faster in the (111) direction, leading to arms in the etch pit, yielding a concave octagon-shaped pit. In a third growth stage, these arms develop side arms, leading to a structure that strongly resembles a self-similar diffusion-limited growth pattern, with strongly preferred growth directions.

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12

Wieghold, Sarah, Lea Nienhaus, Armin Siebel, Maximilian Krause, Patricia Wand, Martin Gruebele, Ueli Heiz y Friedrich Esch. "Au(111)-supported Platinum Nanoparticles: Ripening and Activity". MRS Advances 2, n.º 8 (2017): 439–44. http://dx.doi.org/10.1557/adv.2017.75.

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ABSTRACTThe recent spotlight on supported nanoparticles (NPs) has attracted attention in the field of catalysis and fuel cell technology. Supported NPs can be used as model catalysts to gain a fundamental understanding of the catalytic properties at the interface. Here, especially the wet-chemical preparation of platinum NPs in alkaline ethylene glycol is a powerful approach to synthesize stable particles with a narrow size distribution in the nanometer regime. We combine high resolution imaging by scanning tunneling microscopy with electrochemical characterization by cyclic voltammetry to gain insights into the underlying degradation mechanism of supported platinum NPs, paving the way toward a rational design of supported catalysts with controlled activity and stability.

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13

yokota, Y. y H. Hashimoto. "Formation process of silicide at Pt-Si (111) interface". Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 484–85. http://dx.doi.org/10.1017/s0424820100104480.

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The initial stage of the reaction process forming the platinum silicide at Pt/Si (111) interfaces have been investigated by a high resolution electron microscope in both “flat-on” [1] and “cross-sectional” mode.First, platinum of 11 nm thickness was deposited on a Si (111) wafer. For observing the specimen in “flat-on” mode, the top surface and edge of the specimen were covered by paraffin and etched chemically using CP-4 reagent from backside. The specimen for observing in “cross-sectional” mode was prepared as follows. The Si wafer was cut into slips of 3mm width. After stacking 4 to 6 slips together with epoxy resin, the stacks were sliced to a thickness of 0.3-0.4mm by a diamond saw. The slices were mechanically polished to a thickness lower than 0.05mm and then thinned by Ar ion beam.The formation process of platinum silicide (PtSi) was observed in a cross-sectional specimen.

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14

Janssens, T. V. W. y F. Zaera. "Chemistry of Ethylidene Moieties on Platinum Surfaces: 1,1-Diiodoethane on Pt(111)". Journal of Physical Chemistry 100, n.º 33 (enero de 1996): 14118–29. http://dx.doi.org/10.1021/jp960910w.

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15

Pašti, Igor A., Nemanja M. Gavrilov y Slavko V. Mentus. "Hydrogen Adsorption on Palladium and Platinum Overlayers: DFT Study". Advances in Physical Chemistry 2011 (10 de julio de 2011): 1–8. http://dx.doi.org/10.1155/2011/305634.

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Hydrogen adsorption on twenty different palladium and platinum overlayer surfaces with (111) crystallographic orientation was studied by means of periodic DFT calculations on the GGA-PBE level. Palladium and platinum overlayers here denote either the Pd and Pt mono- and bilayers deposited over (111) crystallographic plane of Pd, Pt, Cu, and Au monocrystals or the (111) crystallographic plane of Pd and Pt monocrystals with inserted one-atom-thick surface underlayer of Pd, Pt, Cu, and Au. The attention was focused on the bond lengths, hydrogen adsorption energetics, mobility of adsorbed hydrogen, and surface reactivity toward hydrogen electrode reactions. Both the ligand and strain effects were considered, found to lead to a significant modification of the electronic structure of Pd and Pt overlayers, described through the position of the d-band center, and tuning of the hydrogen adsorption energy in the range that covers approximately 120 kJmol−1. Mobility of hydrogen adsorbed on studied overlayers was found to be determined by hydrogen-metal binding energy. Obtained results regarding Pd layers on Pt(111) and Au(111) surfaces, in conjunction with some of the recent experimental data, were used to explain its electrocatalytic activity towards hydrogen evolution reaction.

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16

Arend, Rebecca Christian, Bradley J. Monk, Thomas J. Herzog, Jonathan A. Ledermann, Kathleen N. Moore, Angeles Alvarez Secord, Ronnie Shapira-Frommer et al. "Clinical trial in progress: Pivotal study of VB-111 combined with paclitaxel versus paclitaxel for treatment of platinum-resistant ovarian cancer (OVAL, VB-111-701/GOG-3018)." Journal of Clinical Oncology 39, n.º 15_suppl (20 de mayo de 2021): TPS5599. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.tps5599.

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TPS5599 Background: Ofranergene obadenovec (VB-111) is a targeted anti-cancer gene therapy with a dual mechanism of action that includes a broad antiangiogenic effect and induction of a tumor directed immune response. A phase II trial in patients with platinum resistant ovarian cancer showed that VB-111 in combination with weekly paclitaxel was well tolerated and associated with a CA-125 Objective Response Rate (ORR) of 58% with a trend for improved survival. The favorable outcomes were associated with induction of an immunotherapeutic effect of tumor infiltration with CD-8 T cells. Based on these observations, a phase III study was initiated in collaboration with the GOG Foundation, Inc. Methods: Study NCT03398655 is an international, randomized, double-blind, placebo-controlled, phase III study. Eligible patients have recurrent platinum-resistant epithelial ovarian cancer with measurable disease (RECIST 1.1), and may have been previously treated with up to 5 prior lines of therapy. Patient are randomized 1:1 to receive VB-111 (1x1013 VPs) with weekly paclitaxel (80mg/m2), or weekly paclitaxel with placebo. Randomization is stratified by number of prior treatment lines, prior antiangiogenic therapy and platinum refractory disease status. The efficacy endpoints are OS, PFS and ORR by RECIST 1.1 and by CA-125 (GCIG criteria). A pre-planned interim analysis was performed by the DSMC in the first 60 patients evaluable for CA-125 response. The analysis met the pre-defined criteria of a CA-125 ORR (GCIG) in the treatment arm at least 10% higher than in the control arm. Study enrolment is ongoing and over 220 patients were enrolled in the US, EU, and Israel. Enrolment of the full sample size of 400 patients is expected to complete by the end of 2021. Clinical trial information: NCT03398655.

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17

Avery, Neil R. "Thermal evolution of acetylene adsorbed on platinum(111)". Langmuir 4, n.º 2 (marzo de 1988): 445–48. http://dx.doi.org/10.1021/la00080a033.

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18

Liu, Z. M., S. A. Costello, B. Roop, S. R. Coon, S. Akhter y J. M. White. "Surface photochemistry. 6. Methyl bromide on platinum (111)". Journal of Physical Chemistry 93, n.º 22 (noviembre de 1989): 7681–88. http://dx.doi.org/10.1021/j100359a030.

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19

Jo, Sam K. y J. M. White. "Methyl halide photochemistry on iodine-covered platinum(111)". Journal of the American Chemical Society 115, n.º 15 (julio de 1993): 6934–38. http://dx.doi.org/10.1021/ja00068a061.

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20

Mitchell, G. E., Michael A. Henderson y J. M. White. "Adsorption and decomposition of trimethylphosphine on platinum(111)". Journal of Physical Chemistry 91, n.º 14 (julio de 1987): 3808–14. http://dx.doi.org/10.1021/j100298a017.

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21

Costello, S. A., B. Roop, Z. M. Liu y J. M. White. "Photochemistry of methyl bromide adsorbed on platinum(111)". Journal of Physical Chemistry 92, n.º 5 (marzo de 1988): 1019–20. http://dx.doi.org/10.1021/j100316a006.

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22

Square, Lynndle C., Christopher J. Arendse y Theophillus F. G. Muller. "Adsorption of phosphoric acid anions on platinum (111)". Adsorption 23, n.º 7-8 (13 de octubre de 2017): 971–81. http://dx.doi.org/10.1007/s10450-017-9912-3.

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23

Blum, L., N. Marzari y R. Car. "Mechanism of the Hydrogen/Platinum(111) Fuel Cell†". Journal of Physical Chemistry B 108, n.º 51 (diciembre de 2004): 19670–80. http://dx.doi.org/10.1021/jp047188j.

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24

Farkas, A., K. Zalewska-Wierzbicka, C. Bachmann, J. Goritzka, D. Langsdorf, O. Balmes, J. Janek y H. Over. "High Pressure Carbon Monoxide Oxidation over Platinum (111)". Journal of Physical Chemistry C 117, n.º 19 (2 de mayo de 2013): 9932–42. http://dx.doi.org/10.1021/jp401867g.

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25

Tachibana, Takeshi, Yoshihiro Yokota, Koji Kobashi y Mamoru Yoshimoto. "Heteroepitaxial growth of {111}-oriented diamond films on platinum{111}/sapphire{0001} substrates". Journal of Crystal Growth 205, n.º 1-2 (agosto de 1999): 163–68. http://dx.doi.org/10.1016/s0022-0248(99)00223-7.

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26

Arend, Rebecca Christian, Bradley J. Monk, Robert Allen Burger, Thomas J. Herzog, Jonathan A. Ledermann, Kathleen N. Moore, Angeles Alvarez Secord et al. "Clinical trial in progress: Pivotal study of VB-111 combined with paclitaxel versus paclitaxel for treatment of platinum-resistant ovarian cancer (OVAL, VB-111-701/GOG-3018)." Journal of Clinical Oncology 38, n.º 15_suppl (20 de mayo de 2020): TPS6097. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.tps6097.

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TPS6097 Background: Ofranergene obadenovec (VB-111) is a targeted anti-cancer gene therapy with a dual mechanism: a broad antiangiogenic effect and induction of a tumor directed viral immune response. In a phase II trial in platinum resistant ovarian cancer VB-111 in combination with weekly paclitaxel showed a CA-125 response rate (RR) of 58% and median overall survival (OS) of 498 days compared to 172.5 days in the sub-therapeutic dose (p = 0.028). The combination treatment was well tolerated. Favorable outcomes were associated with induction of an immunotherapeutic effect of tumor infiltration with CD-8 T cells. Based on these observations, a phase III randomized controlled trial, VB-111-701/GOG-3018 (OVAL) was initiated in collaboration with the GOG Foundation, Inc. Methods: The OVAL study, NCT03398655, is an international, randomized, double-blind, placebo-controlled, phase III study. Patients with recurrent platinum-resistant epithelial ovarian cancer, who have measurable disease (RECIST 1.1) and were previously treated with up to 5 lines are randomized 1:1 to receive VB-111 (1x1013 VPs) with weekly paclitaxel (80mg/m2), or weekly paclitaxel with placebo. Randomization is stratified by number of prior treatment lines, prior antiangiogenic therapy and platinum refractory disease status. Treatment beyond asymptomatic RECIST progression may continue until progression is confirmed by follow up imaging. The primary endpoints are OS, safety and tolerability. Secondary endpoints include progression free survival, and objective RR by CA-125 (per GCIG criteria) and RECIST 1.1. The sample size calculation of 400 patients (event driven) provides 92% power to detect a difference in survival at the two-sided 5% significance level using the logrank test. A pre-planned interim analysis will take place in Q1 2020 to assess whether the CA-125 RR per GCIG criteria in the treatment arm is sufficiently larger than in the control arm and is comparable to the positive results of the phase II study. Study enrolment is ongoing and over 80 patients were enrolled in the US and Israel. Enrollment expansion to Europe is planned in 2020. Clinical trial information: NCT03398655.

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27

Schwarz, Kathleen A., Ravishankar Sundararaman, Thomas P. Moffat y Thomas C. Allison. "Formic acid oxidation on platinum: a simple mechanistic study". Physical Chemistry Chemical Physics 17, n.º 32 (2015): 20805–13. http://dx.doi.org/10.1039/c5cp03045e.

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Formic acid oxidation on Pt(111) under electrocatalytic conditions occurs when a formate anion approaches the Pt(111) surface in the CH-down orientation, and barrierlessly releases carbon dioxide as the H binds to the surface.

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28

Yuan, Chentian, Timo Fuchs, Serhiy Cherevko, Jakub Drnec, Olaf M. Magnussen y David A. Harrington. "Electrooxidation of Platinum". ECS Meeting Abstracts MA2022-01, n.º 55 (7 de julio de 2022): 2321. http://dx.doi.org/10.1149/ma2022-01552321mtgabs.

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Platinum is an important catalyst widely used in energy conversion and storage, especially in the hydrogen-oxygen polymer electrolyte membrane fuel cell, where it is used at the anode and cathode1. However, potential excursions can lead to surface oxidation and reduction, which restructures the surface and can lower the efficiency of the catalyst and lead to dissolution2. Platinum atoms leave their original lattice sites during oxidation. Surface X-ray diffraction (SXRD) has determined that on Pt(111) the initial stage of Pt extraction is in a place-exchange process, in which the Pt atom moves directly above its original site, which is now occupied by an oxygen atom3. However, on Pt(100) recent work by our team has shown that the initial oxidation gives a “stripe” structure comprising 1D chains of raised Pt and oxygen atoms4. Presented here is an analysis of combined simultaneous SXRD and electrochemistry data for Pt(111) and Pt(100) oxidation in HClO4 and H2SO4. The correlation between the charge transfer and Pt extraction processes is investigated by in-situ cyclic voltammetry, potential step, and potential sweep-hold measurements. The prior structural analysis from a complete set of crystal truncation rods is used find calibration curves for the X-ray intensity of selected anti-Bragg reflections as a function of the coverages θPE of different types of extracted Pt atoms. Integration of charge during electrochemical measurements was converted to electrons passed per surface Pt atoms, to give a notional “electron coverage” θe. In this way, simultaneous measurement of intensity with current during the selected potential program can be converted to θe vs θPE curves. The slopes of these curves are compared with suggested stoichiometric reactions, based on the known SXRD-determined structures. There is some uncertainty insofar as SXRD cannot distinguish O from OH, but we are able to estimate Pt oxidation states. On Pt(111), the electron-transfer and Pt extraction coverage ratios vary with sweep rate, indicating that the rates of adsorption and extraction are kinetically determined and changing during the first oxidation peak. On Pt(100), the stripe structure and stoichiometry suggest a Pt(II) oxide component in the initial stages. We thank other team members involved in various phases of this work: Natalie Stubb (University of Victoria), Valentin Briega-Martos, Daniel Sandbeck (Forschungszentrum Jülich GmbH), Martin Ruge, Ole Fehrs (Kiel University), Federico Calle-Vallejo (Universistat de Barcelona), and the ID31 beamline staff at ESRF. Financial support from NSERC and DFG is appreciated. Reference R. Stamenkovic, D. Strmcnik, P. P. Lopes, N. M. Markovic, Energy and fuels from electrochemical interfaces, Nature materials, 16 (2017) 57-69. J. Sandbeck, O. Brummel, K. J. Mayrhofer, J. Libuda, I. Katsounaros, S. Cherevko, Dissolution of platinum single crystals in acidic medium, ChemPhysChem, 20 (2019) 2997. Drnec, M. Ruge, F. Reikowski, B. Rahn, F. Carlà, R. Felici, J. Stettner, O.M. Magnussen, D.A. Harrington, Initial stages of Pt(111) Electrooxidation: Dynamic and Structural Studies by Surface X-ray Diffraction, Electrochim. Acta, 224 (2017) 220-227. Fuchs, J. Drnec, F. Calle-Vallejo, N. Stubb, D. J. Sandbeck, M. Ruge, S. Cherevko, D. A. Harrington, O. M. Magnussen, Structure dependency of the atomic-scale mechanisms of platinum electro-oxidation and dissolution, Nature Catalysis, 3 (2020) 754-761.

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29

Cohen, Yael Chava, Suzanne T. Berlin, Michael J. Birrer, Susana M. Campos, Tamar Rachmilewitz Minei, Dror Harats y Richard T. Penson. "Ofranergene obadenovec (VB-111) in platinum resistant ovarian cancer: with an immunotherapeutic effect." Journal of Clinical Oncology 37, n.º 15_suppl (20 de mayo de 2019): 5542. http://dx.doi.org/10.1200/jco.2019.37.15_suppl.5542.

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5542 Background: VB-111 is a targeted anti-cancer gene therapy with a dual mechanism: anti angiogenic/vascular disruption and induction of an anti-tumor directed immune response. We report final results of a phase I/II study of VB-111 in combination with paclitaxel in patients with platinum-resistant ovarian cancer. Methods: Study NCT01711970 was a prospective, open label, dose escalating study assessing combination treatment of VB-111 Q8W and weekly Paclitaxel. In the phase I part of the study patients were treated with escalating doses of intravenous VB-111 and Paclitaxel. In phase 2 patients were treated with therapeutic doses of VB-111 1x1013 Viral Particles and paclitaxel 80mg/m2. Assessments included safety, overall survival (OS), PFS, tumor response (CA-125 and RECIST) and histopathology. Results: 21 patients with recurrent platinum-resistant ovarian cancer were enrolled and treated in 2 US sites. Patients received a mean of 2.3 ±1.8 repeat doses of VB-111. 17/21 received the therapeutic dose. Median age was 65 (41-79) with a median of 3 (1-4) prior lines of therapy. Half of the subjects were Platinum refractory, and half were previously treated with antiangiogenics. No DLTs were observed. VB-111 was well tolerated and was associated with generally mild flu-like symptoms. In the therapeutic dose cohort, a 58% CA-125 GCIG response rate was seen in evaluable patients including durable responses, and responses in patients with platinum refractory disease and post anti-angiogenic failure . The median OS was 498 days in patients treated with Therapeutic Dose compared to 173 days in Sub-therapueutic dose (p = 0.028). Tumor Specimens taken after treatment demonstrated tumor infiltrated with cytotoxic CD8 T-cells and regions of apoptotic cancer cells. Conclusions: Treatment with VB-111 in combination with weekly Paclitaxel was safe and well tolerated. Favorable tumor responses and overall survival outcomes were associated with induction of an immunotherapeutic effect manifested as tumor infiltration with CD-8 T cells. Encouraging results are the basis for further exploration in the ongoing, placebo controlled, pivotal OVAL study. Clinical trial information: NCT01711970.

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30

Shintani, Yoshihiro. "Growth of highly (111)-oriented, highly coalesced diamond films on platinum (111) surface: A possibility of heteroepitaxy". Journal of Materials Research 11, n.º 12 (diciembre de 1996): 2955–56. http://dx.doi.org/10.1557/jmr.1996.0373.

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A highly (111)-oriented, highly coalesced diamond film was grown on platinum (111) surface by microwave plasma chemical vapor deposition (MPCVD). Scanning electron microscopy and x-ray diffraction analyses revealed that the (111) diamond facets were azimuthally oriented epitaxially with respect to the orientation of the Pt(111) domain underneath, with the neighboring facets of diamond being coalesced with each other. The film was confirmed as diamond using Raman spectroscopy.

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31

Grgur, Branimir, Nenad Markovic, Chriss Lucas y Philip Ross. "Electrochemical oxidation of carbon monoxide: From platinum single crystals to low temperature fuel cells catalysts. Part I: Carbon monoxide oxidation onto low index platinum single crystals". Journal of the Serbian Chemical Society 66, n.º 11-12 (2001): 785–97. http://dx.doi.org/10.2298/jsc0112785g.

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The electrochemical oxidation of carbon monoxide and the interfacial structure of the CO adlayer (COads) on platinum low index single crystals, Pt(111), Pt(100) and two reconstruction of Pt(110), were examined using the rotation disk electrode method in combination with the in situ surface X-ray diffraction scattering technique. The mechanism of CO oxidation is discussed on the basis of the findings that, depending on the potential, two energetic states ofCOads exist on the platinum surfaces. Thus, at lower potentials, weakly bonded states (COads,w) and at higher potentials strongly bonded states (COads,s) are formed. The mechanism of the oxidation of hydrogen-carbon monoxide mixtures is also proposed.

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32

Wong, Yat Ting y Roald Hoffmann. "Chemisorption of carbon monoxide on three metal surfaces: nickel(111), palladium(111), and platinum(111): a comparative study". Journal of Physical Chemistry 95, n.º 2 (enero de 1991): 859–67. http://dx.doi.org/10.1021/j100155a069.

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33

Grubb, S. G., A. M. DeSantolo y R. B. Hall. "Optical second-harmonic generation studies of molecular adsorption on platinum (111) and nickel (111)". Journal of Physical Chemistry 92, n.º 6 (marzo de 1988): 1419–25. http://dx.doi.org/10.1021/j100317a011.

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34

Hoshi, Nagahiro, Yusuke Asaumi, Masashi Nakamura, Kosuke Mikita y Risa Kajiwara. "Structural Effects on the Hydrogen Oxidation Reaction on n(111)−(111) Surfaces of Platinum". Journal of Physical Chemistry C 113, n.º 39 (9 de septiembre de 2009): 16843–46. http://dx.doi.org/10.1021/jp9076239.

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35

Ragan, Regina, Doug Ohlberg, Jason J. Blackstock, Sehun Kim y R. Stanley Williams. "Atomic Surface Structure of UHV-Prepared Template-Stripped Platinum and Single-Crystal Platinum(111)". Journal of Physical Chemistry B 108, n.º 52 (diciembre de 2004): 20187–92. http://dx.doi.org/10.1021/jp0466789.

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36

Richardson, S. J., M. R. Burton, P. A. Staniec, I. S. Nandhakumar, N. J. Terrill, J. M. Elliott y A. M. Squires. "Aligned platinum nanowire networks from surface-oriented lipid cubic phase templates". Nanoscale 8, n.º 5 (2016): 2850–56. http://dx.doi.org/10.1039/c5nr06691c.

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37

Zhang, J., M. B. Vukmirovic, K. Sasaki, F. Uribe y R. R. Adzic. "Platinum monolayer electrocatalysts for oxygen reduction: Effect of substrates, and long-term stability". Journal of the Serbian Chemical Society 70, n.º 3 (2005): 513–25. http://dx.doi.org/10.2298/jsc0503513z.

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Resumen

We describe a novel concept for a Pt monolayer electrocatalyst and present the results of our electrochemical, X-ray absorption spectroscopy, and scanning tunneling microscopy studies. The electrocatalysts were prepared by a new method for depositing Pt monolayers involving the galvanic displacement by Pt of an under potentially deposited Cu monolayer on substrates of Au (111), Ir(111), Pd(111), Rh(111) and Ru(0001) single crylstals, and Pd nanoparticles. The kinetics of O2 reduction showed significant enhancement with Pt monolayers on Pd(111) and Pd nanoparticle surfaces in comparisonwith the reaction on Pt(111) and Pt nanoparticles, respectively. This increase in catalytic activity is attributed partly to the decreased formation of PtOH, as shown by in situ X-ray absorption spectroscopy. The results illustrate that placing a Pt monolayer on a suitable substrate of metal nanoparticles is an attractive way of designing better O2 reduction electrocatalysts with very low Pt contents.

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38

Bartram, Michael E., R. G. Windham y B. E. Koel. "Coadsorption of nitrogen dioxide and oxygen on platinum(111)". Langmuir 4, n.º 2 (marzo de 1988): 240–46. http://dx.doi.org/10.1021/la00080a001.

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39

Heikkinen, Olli, Hugo Pinto, Godhuli Sinha, Sampsa K. Hämäläinen, Jani Sainio, Sven Öberg, Patrick R. Briddon, Adam S. Foster y Jouko Lahtinen. "Characterization of a Hexagonal Phosphorus Adlayer on Platinum (111)". Journal of Physical Chemistry C 119, n.º 22 (21 de mayo de 2015): 12291–97. http://dx.doi.org/10.1021/jp5126816.

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40

Johnson, Allen L., E. L. Muetterties, J. Stohr y F. Sette. "Chemisorption geometry of pyridine on platinum(111) by NEXAFS". Journal of Physical Chemistry 89, n.º 19 (septiembre de 1985): 4071–75. http://dx.doi.org/10.1021/j100265a029.

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41

Henderson, Michael A. y J. M. White. "Adsorption and decomposition of dimethyl methylphosphonate on platinum(111)." Journal of the American Chemical Society 110, n.º 21 (octubre de 1988): 6939–47. http://dx.doi.org/10.1021/ja00229a002.

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42

Liu, Z. M., X. L. Zhou, D. A. Buchanan, J. Kiss y J. M. White. "The surface chemistry of vinyl iodide on platinum(111)". Journal of the American Chemical Society 114, n.º 6 (marzo de 1992): 2031–39. http://dx.doi.org/10.1021/ja00032a016.

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43

Komanicky, Vladimir y W. Ronald Fawcett. "Fabrication of an annealable platinum (111) single crystal ultramicroelectrode". Journal of Electroanalytical Chemistry 556 (septiembre de 2003): 109–15. http://dx.doi.org/10.1016/s0022-0728(03)00336-x.

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44

Jiang, L. Q., Armen Avoyan, Bruce E. Koel y John L. Falconer. "Methylcyclohexane-to-benzene conversion over potassium-promoted platinum(111)". Journal of the American Chemical Society 115, n.º 25 (diciembre de 1993): 12106–10. http://dx.doi.org/10.1021/ja00078a056.

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45

Kyuno, Kentaro y Gert Ehrlich. "Diffusion and dissociation of platinum clusters on Pt(111)". Surface Science 437, n.º 1-2 (agosto de 1999): 29–37. http://dx.doi.org/10.1016/s0039-6028(99)00659-7.

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46

Ernst, K. H. y K. Christmann. "The interaction of glycine with a platinum (111) surface". Surface Science 224, n.º 1-3 (diciembre de 1989): 277–310. http://dx.doi.org/10.1016/0039-6028(89)90916-3.

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47

Ernst, K. H. y K. Christmann. "The interaction of glycine with a platinum (111) surface". Surface Science Letters 224, n.º 1-3 (diciembre de 1989): A628. http://dx.doi.org/10.1016/0167-2584(89)90160-6.

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48

Dong, C. Z., S. M. Shivaprasad, K. ‐J Song y T. E. Madey. "Platinum‐induced morphology and reactivity changes on W(111)". Journal of Chemical Physics 99, n.º 11 (diciembre de 1993): 9172–81. http://dx.doi.org/10.1063/1.465532.

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49

Gölzhäuser, Armin y Gert Ehrlich. "Direct Observation of Platinum Atoms on Pt(111) Clusters". Zeitschrift für Physikalische Chemie 202, Part_1_2 (enero de 1997): 59–74. http://dx.doi.org/10.1524/zpch.1997.202.part_1_2.059.

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50

Wang, Zhanzhong, Quanyu Suo, Caixia Zhang, Zhanli Chai y Xiaojing Wang. "Solvent-controlled platinum nanocrystals with a high growth rate along 〈100〉 to 〈111〉 and enhanced electro-activity in the methanol oxidation reaction". RSC Advances 6, n.º 92 (2016): 89098–102. http://dx.doi.org/10.1039/c6ra18171f.

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