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Pietrzak M, Jopa S, Mames A, Urbańczyk M, Woźny M, Ratajczyk T. Recent Progress in Liquid State Electrochemistry Coupled with NMR Spectroscopy. ChemElectroChem 2021. [DOI: 10.1002/celc.202100724] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Mariusz Pietrzak
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Sylwia Jopa
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Adam Mames
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Mateusz Urbańczyk
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
- Centre of New Technologies University of Warsaw Banacha 2 C 02-097 Warsaw Poland
| | - Mateusz Woźny
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Tomasz Ratajczyk
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
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Wesley T, Román-Leshkov Y, Surendranath Y. Spontaneous Electric Fields Play a Key Role in Thermochemical Catalysis at Metal-Liquid Interfaces. ACS CENTRAL SCIENCE 2021; 7:1045-1055. [PMID: 34235265 PMCID: PMC8228591 DOI: 10.1021/acscentsci.1c00293] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Indexed: 05/20/2023]
Abstract
Large oriented electric fields spontaneously arise at all solid-liquid interfaces via the exchange of ions and/or electrons with the solution. Although intrinsic electric fields are known to play an important role in molecular and biological catalysis, the role of spontaneous polarization in heterogeneous thermocatalysis remains unclear because the catalysts employed are typically disconnected from an external circuit, which makes it difficult to monitor or control the degree of electrical polarization of the surface. Here, we address this knowledge gap by developing general methods for wirelessly monitoring and controlling spontaneous electrical polarization at conductive catalysts dispersed in liquid media. By combining electrochemical and spectroscopic measurements, we demonstrate that proton and electron transfer from solution controllably, spontaneously, and wirelessly polarize Pt surfaces during thermochemical catalysis. We employ liquid-phase ethylene hydrogenation on a Pt/C catalyst as a thermochemical probe reaction and observe that the rate of this nonpolar hydrogenation reaction is significantly influenced by spontaneous electric fields generated by both interfacial proton transfer in water and interfacial electron transfer from organometallic redox buffers in a polar aprotic ortho-difluorobenzene solvent. Across these vastly disparate reaction media, we observe quantitatively similar scaling of ethylene hydrogenation rates with the Pt open-circuit electrochemical potential (E OCP). These results isolate the role of interfacial electrostatic effects from medium-specific chemical interactions and establish that spontaneous interfacial electric fields play a critical role in liquid-phase heterogeneous catalysis. Consequently, E OCP-a generally overlooked parameter in heterogeneous catalysis-warrants consideration in mechanistic studies of thermochemical reactions at solid-liquid interfaces, alongside chemical factors such as temperature, reactant activities, and catalyst structure. Indeed, this work establishes the experimental and conceptual foundation for harnessing electric fields to both elucidate surface chemistry and manipulate preparative thermochemical catalysis.
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Affiliation(s)
- Thejas
S. Wesley
- Department
of Chemical Engineering and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yuriy Román-Leshkov
- Department
of Chemical Engineering and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yogesh Surendranath
- Department
of Chemical Engineering and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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3
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Zanata CR, Gaiotti AC, Sandim LR, Martins CA, Pinto LM, Janete Giz M, Camara GA. How decoration with Tl affects CO electro-oxidation on Pd (1 0 0) nanocubes: In situ FTIR and ab-initio insights. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115149] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Revisiting glycerol electrooxidation by applying derivative voltammetry: From well-ordered bulk Pt to bimetallic nanoparticles. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114139] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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McPherson IJ, Ash PA, Jones L, Varambhia A, Jacobs RMJ, Vincent KA. Electrochemical CO Oxidation at Platinum on Carbon Studied through Analysis of Anomalous in Situ IR Spectra. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:17176-17187. [PMID: 28845207 PMCID: PMC5563840 DOI: 10.1021/acs.jpcc.7b02166] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 07/21/2017] [Indexed: 05/29/2023]
Abstract
The oxidation of adsorbed CO is a key reaction in electrocatalysis. It has been studied extensively on both extended model surfaces and on nanoparticles; however, correlation between the two is far from simple. Molecular insight into the reaction is often provided using in situ IR spectroscopy; however, practical challenges mean in situ studies on nanoparticles have yet to provide the same level of detail as those on model surfaces. Here we use a new approach to in situ IR spectroscopy to study the mechanism of CO adlayer oxidation on a commercial carbon-supported Pt catalyst. We observe bipolar IR absorption bands but develop a simple model to enable fitting. Quantitative analysis of band behavior during the oxidation prepeak using the model agrees well with previous analysis based on conventional absorption bands. A second linear CO band is observed during the main oxidation region and is assigned to the distinct contribution of CO on step as opposed to terrace sites. Analysis of the step and terrace CO bands during oxidation shows that oxidation begins on the terraces of the nanoparticles before CO on steps is removed. Further correlation of this behavior with the current shows that step CO is only lost in the first of the two main oxidation peaks.
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Affiliation(s)
- Ian J. McPherson
- Department
of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
| | - Philip A. Ash
- Department
of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
| | - Lewys Jones
- Department
of Materials, University of Oxford, 16 Parks Road, Oxford OX1 3PH, U.K.
| | - Aakash Varambhia
- Department
of Materials, University of Oxford, 16 Parks Road, Oxford OX1 3PH, U.K.
| | - Robert M. J. Jacobs
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
| | - Kylie A. Vincent
- Department
of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
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6
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Weber I, Solla-Gullón J, Brimaud S, Feliu JM, Jürgen Behm R. Structure, surface chemistry and electrochemical de-alloying of bimetallic PtxAg100-x nanoparticles: Quantifying the changes in the surface properties for adsorption and electrocatalytic transformation upon selective Ag removal. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.11.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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López-Lorente ÁI, Mizaikoff B. Recent advances on the characterization of nanoparticles using infrared spectroscopy. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Herranz T, Ibáñez M, Gómez de la Fuente JL, Pérez-Alonso FJ, Peña MA, Cabot A, Rojas S. In Situ Study of Ethanol Electrooxidation on Monodispersed Pt3Sn Nanoparticles. ChemElectroChem 2014. [DOI: 10.1002/celc.201300254] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Han OH, Han KS, Shin CW, Lee J, Kim SS, Um MS, Joh HI, Kim SK, Ha HY. Observation of Methanol Behavior in Fuel Cells In Situ by NMR Spectroscopy. Angew Chem Int Ed Engl 2012; 51:3842-5. [DOI: 10.1002/anie.201108330] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2011] [Indexed: 11/09/2022]
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10
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Han OH, Han KS, Shin CW, Lee J, Kim SS, Um MS, Joh HI, Kim SK, Ha HY. Observation of Methanol Behavior in Fuel Cells In Situ by NMR Spectroscopy. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108330] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Brimaud S, Jusys Z, Behm RJ. Controlled Surface Structure for In Situ ATR-FTIRS Studies Using Preferentially Shaped Pt Nanocrystals. Electrocatalysis (N Y) 2011. [DOI: 10.1007/s12678-011-0040-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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5 Structure and Reactivity of Transition Metal Chalcogenides toward the Molecular Oxygen Reduction Reaction. MODERN ASPECTS OF ELECTROCHEMISTRY 2011. [DOI: 10.1007/978-1-4419-5580-7_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Zeng DM, Jiang YX, Zhou ZY, Su ZF, Sun SG. In situ FTIR spectroscopic studies of (bi)sulfate adsorption on electrodes of Pt nanoparticles supported on different substrates. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.11.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Santana JA, Ishikawa Y. Density-functional theory study of interactions between water and carbon monoxide adsorbed on platinum under electrochemical conditions. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.07.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kunimatsu K, Sato T, Uchida H, Watanabe M. Adsorption/oxidation of CO on highly dispersed Pt catalyst studied by combined electrochemical and ATR-FTIRAS methods: oxidation of CO adsorbed on carbon-supported Pt catalyst and unsupported Pt black. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3590-3601. [PMID: 18288871 DOI: 10.1021/la702441x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
ATR-FTIRAS measurements combined with linear potential sweep voltammetry were conducted to investigate oxidation of CO adsorbed on a highly dispersed Pt catalyst supported on carbon black, Pt/C, and carbon-unsupported Pt black catalyst, Pt-B. Bands nu(CO) of atop- and bridge-bonded COs were resolved into those of COs adsorbed at terrace and step edge sites by curve-fitting analysis. At the high coverage near the saturation, a band around 1950-1960 cm(-1) assigned to asymmetric bridge-bonded CO, CO(B)(asym), was observed to develop on both Pt/C and Pt-B, which was the predominant type on the latter. Preferential oxidation of atop-CO adsorbed at the step edge site was commonly observed on both Pt/C and Pt-B during the potential sweep from 0.05 to 1.2 V. However, it has been found that CO(B)(asym) is the most reactive species. The high reactivity of the CO(B)(asym) on Pt/C and Pt-B is demonstrated for the first time in the present report. Adsorption of CO on the Pt/C and Pt-B resulted in growth of a sharp nu(OH) band around 3642-3645 cm(-1) which is assigned to non-hydrogen-bonded water molecules coadsorbed with CO. The nu(OH) band frequency exhibits a linear increase with potential with a Stark tuning rate of ca. 20 cm(-1)/V. Analysis of the potential dependence of this band in the CO oxidation potential region led us to conclude that this is the oxygen-containing species to oxidize adsorbed CO. Stark tuning rates of nu(CO) bands for the COs at the terrace and step edge sites on both Pt/C and Pt-B are almost independent of the adsorption sites for both atop- and bridge-bonded COs. However, CO(B)(asym) exhibits tuning rates of 41 cm-1/V and 37 cm-1/ V on Pt/C and Pt-B, respectively, which is in between the rates of atop and symmetric bridge-bonded COs.
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Affiliation(s)
- Keiji Kunimatsu
- Clean Energy Research Center and Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan
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Electrocatalytic applications of a vertical Au nanorod array using ultrathin Pt/Ru/Pt layer-by-layer coatings. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Korzeniewski C. Recent Advances in in‐situ Infrared Spectroscopy and Applications in Single‐Crystal Electrochemistry and Electrocatalysis. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/9783527616817.ch7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Effect of the structure of Pt–Ru/C particles on COad monolayer vibrational properties and electrooxidation kinetics. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.07.061] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Sato T, Kunimatsu K, Uchida H, Watanabe M. Adsorption/oxidation of CO on highly dispersed Pt catalyst studied by combined electrochemical and ATR-FTIRAS methods. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.05.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Tel-Vered R, Bard AJ. Generation and Detection of Single Metal Nanoparticles Using Scanning Electrochemical Microscopy Techniques. J Phys Chem B 2006; 110:25279-87. [PMID: 17165973 DOI: 10.1021/jp064434d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Different pathways towards the generation and detection of a single metal nanoparticle (MNP) on a conductive carbon support for testing as an electrocatalyst are described. Various approaches were investigated including interparticle distance enhancement, electrochemical and mechanical tip-substrate MNP transfer onto macroscopic surfaces, scanning electrochemical microscopy (SECM)-controlled electrodeposition, and the use of selective binding monolayers on carbon fiber electrodes (CFEs) for solution-phase-selective adsorption. A novel SECM technique for electrodepositing MNPs on CFE tips immersed 100-200 nm below the electrolyte level was developed and used to generate single Pt and Ni nanoparticles. Following their generation, we demonstrate electrocatalytic detection of Fe3+ on individual Pt particles with the CFE in a Fe3+/H2SO4 solution. We also describe an approach of attaching MNPs to CFEs by controlling the composition of monolayers bonded to the CFE. By employing a monolayer with a low ratio of binding (e.g., 4-aminopyridine) to nonbinding molecules (e.g., aniline) and controlling the position of the CFE in a colloidal Pt solution with a SECM, we attached a single 15 nm radius Pt nanoparticle to the CFE. Such chemisorbed Pt particles exhibited a stronger adhesion on surface-modified CFEs and better mechanical stability during proton reduction than MNPs electrodeposited directly on the CFE.
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Affiliation(s)
- Ran Tel-Vered
- Department of Chemistry and Biochemistry and the Center for Nano and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712, USA
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23
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Maillard F, Savinova ER, Simonov PA, Zaikovskii VI, Stimming U. Infrared Spectroscopic Study of CO Adsorption and Electro-oxidation on Carbon-Supported Pt Nanoparticles: Interparticle versus Intraparticle Heterogeneity. J Phys Chem B 2004. [DOI: 10.1021/jp0479163] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frédéric Maillard
- Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany, and Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
| | - Elena R. Savinova
- Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany, and Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
| | - Pavel A. Simonov
- Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany, and Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
| | - Vladimir I. Zaikovskii
- Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany, and Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
| | - Ulrich Stimming
- Technische Universität München, Department of Physics E19, James-Franck-Str. 1, D-85748 Garching, Germany, and Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
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Setup, sensitivity and application of thin electrolyte layer ATR-FTIR spectroscopy. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2004.01.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Gao L, Huang H, Korzeniewski C. The efficiency of methanol conversion to CO2 on thin films of Pt and PtRu fuel cell catalysts. Electrochim Acta 2004. [DOI: 10.1016/j.electacta.2003.07.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Pecharromán C, Cuesta A, Gutiérrez C. Calculation of adsorption-induced differential external reflectance infrared spectra of particulate metals deposited on a substrate. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.09.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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27
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Model approach to evaluate particle size effects in electrocatalysis: preparation and properties of Pt nanoparticles supported on GC and HOPG. Electrochim Acta 2003. [DOI: 10.1016/s0013-4686(03)00519-x] [Citation(s) in RCA: 172] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Wieckowski A. Tribute to Professor Michael J. Weaver (1947–2002). J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00328-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Electrochemical characterisation of platinum–palladium nanoparticles prepared in a water-in-oil microemulsion. J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00214-6] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Horswell SL, O'Nei IA, Schiffrin DJ. Kinetics of Electron Transfer at Pt Nanostructured Film Electrodes. J Phys Chem B 2003. [DOI: 10.1021/jp0340257] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sarah L. Horswell
- Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, Liverpool L69 7DZ, UK
| | - Ian A. O'Nei
- Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, Liverpool L69 7DZ, UK
| | - David J. Schiffrin
- Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, Liverpool L69 7DZ, UK
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Park S, Wieckowski A, Weaver MJ. Electrochemical infrared characterization of CO comains on ruthenium-decorated platinum nanoparticles. J Am Chem Soc 2003; 125:2282-90. [PMID: 12590558 DOI: 10.1021/ja028154x] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Spectra obtained by electrochemical infrared reflection absorption spectroscopy (EC-IRAS) for carbon monoxide (CO) adlayers formed by partial CO dosing on various ruthenium-decorated platinum nanoparticle films are reported. The need to achieve a well distributed rather than aggregated metal nanoparticle array is demonstrated, given that such nanoparticle aggregates induce complex dielectric behavior. The strategy here is to use an "organic glue matrix" (short chain SAMs) between the nanoparticles and the gold substrates. The observed promotion in CO electrooxidation by the existence of a Ru island on Pt nanoparticles, of interest to fuel-cell catalysis, showed a strong relationship with Ru surface concentrations, consistent with previous studies on single crystal or polycrystalline bimetallic surfaces. Two distinctive CO infrared bands, one for the Pt-CO and one for Ru-CO domain were found after the dipole coupling of CO within the two CO domains was minimized. Interestingly, those two CO bands showed independent electrooxidation behavior with electrode potential changes. Also, it is shown that the electrooxidation of CO on large Ru islands is less facile than on small Ru islands. In addition, the activity of commercial Pt/Ru alloy nanoparticles to CO stripping was tested and IRAS spectra were reported as a comparison to our Ru-decorated Pt nanoparticles.
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Affiliation(s)
- Sungho Park
- Contribution from the Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
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33
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Mo Y, Sarangapani S, Le A, Scherson DA. Electrochemical characterization of unsupported high area platinum dispersed on the surface of a glassy carbon rotating disk electrode in the absence of Nafion® or other additives. J Electroanal Chem (Lausanne) 2002. [DOI: 10.1016/s0022-0728(02)00969-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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de Souza JPI, Queiroz SL, Bergamaski K, Gonzalez ER, Nart FC. Electro-Oxidation of Ethanol on Pt, Rh, and PtRh Electrodes. A Study Using DEMS and in-Situ FTIR Techniques. J Phys Chem B 2002. [DOI: 10.1021/jp014645c] [Citation(s) in RCA: 304] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. P. I. de Souza
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos (SP), Brazil
| | - S. L. Queiroz
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos (SP), Brazil
| | - K. Bergamaski
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos (SP), Brazil
| | - E. R. Gonzalez
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos (SP), Brazil
| | - F. C. Nart
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos (SP), Brazil
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35
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Park S, Weaver MJ. A Versatile Surface Modification Scheme for Attaching Metal Nanoparticles onto Gold: Characterization by Electrochemical Infrared Spectroscopy. J Phys Chem B 2002. [DOI: 10.1021/jp025957y] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sungho Park
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-1393
| | - Michael J. Weaver
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-1393
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36
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Some interpretations of surface vibrational spectroscopy pertinent to fuel-cell electrocatalysis. Electrochim Acta 2002. [DOI: 10.1016/s0013-4686(02)00331-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Sun SG. Reply to the “Comments on the paper by M.-S. Zheng and S.-G. Sun entitled ‘In situ FTIR spectroscopic studies of CO adsorption on electrodes with nanometer-scale thin films of ruthenium in sulfuric acid solutions’ by C. Pecharromán, A. Cuesta and C. Gutiérrez”. J Electroanal Chem (Lausanne) 2002. [DOI: 10.1016/s0022-0728(02)00967-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Pecharromán C, Cuesta A, Gutiérrez C. Comments on the paper by M.-S. Zheng and S.-G. Sun entitled ‘In situ FTIR spectroscopic studies of CO adsorption on electrodes with nanometer-scale thin films of ruthenium in sulfuric acid solutions’ [J. Electroanal. Chem. 500 (2001) 223]. J Electroanal Chem (Lausanne) 2002. [DOI: 10.1016/s0022-0728(02)00968-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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