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Kumeda T, Hoshi N, Nakamura M. Effect of Hydrophobic Cations on the Inhibitors for the Oxygen Reduction Reaction on Anions and Ionomers Adsorbed on Single-Crystal Pt Electrodes. ACS APPLIED MATERIALS & INTERFACES 2021; 13:15866-15871. [PMID: 33755425 DOI: 10.1021/acsami.1c01421] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Weakening of the poisoning by the specifically adsorbed anions assists in developing next-generation electrocatalysts for use in low-temperature fuel cells. In this study, we evaluated how hydrophobic cations with different alkyl chain lengths affect the oxygen reduction reaction (ORR) activities on the single-crystal Pt surfaces in contact with sulfuric acid solution and Nafion ionomers. Interfacial tetraalkylammonium cations with longer alkyl chains activated the ORR on the Pt(111) surface. In a solution containing tetrahexylammonium cations (THA+), the ORR activities on Pt(111) in sulfuric acid solution and on Nafion-modified Pt(111) in perchloric acid solution were four and eight times higher than those in the solutions without THA+, respectively. Infrared spectroscopy revealed the reduction of the amount of (bi)sulfate anions and the sulfonate group of Nafion adsorbed on Pt(111) due to the presence of THA+. The hydrophobic cations weaken the noncovalent interactions between specifically adsorbed species and promote the ORR.
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Affiliation(s)
- Tomoaki Kumeda
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
| | - Nagahiro Hoshi
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
| | - Masashi Nakamura
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
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Climent V, Feliu J. Single Crystal Electrochemistry as an In Situ Analytical Characterization Tool. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2020; 13:201-222. [PMID: 32243760 DOI: 10.1146/annurev-anchem-061318-115541] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The electrochemical behavior of platinum single crystal surfaces can be taken as a model response for the interpretation of the activity of heterogeneous electrodes. The cyclic voltammogram of a given platinum electrode can be considered a fingerprint characteristic of the distribution of sites on its surface. We start this review by providing some simple mathematical descriptions of the voltammetric response in the presence of adsorption processes. We then describe the voltammogram of platinum basal planes, followed by the response of stepped surfaces. The voltammogram of polycrystalline materials can be understood as a composition of the response of the different basal contributions. Further resolution in the discrimination of different surface sites can be achieved with the aid of surface modification using adatoms such as bismuth or germanium. The application of these ideas is exemplified with the consideration of real catalysts composed of platinum nanoparticles with preferential shapes.
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Affiliation(s)
- Víctor Climent
- Instituto Universitario de Electroquímica, Universidad de Alicante, E-03690, San Vicente del Raspeig, Alicante, Spain;
| | - Juan Feliu
- Instituto Universitario de Electroquímica, Universidad de Alicante, E-03690, San Vicente del Raspeig, Alicante, Spain;
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Chen X, Granda-Marulanda LP, McCrum IT, Koper MTM. Adsorption processes on a Pd monolayer-modified Pt(111) electrode. Chem Sci 2020; 11:1703-1713. [PMID: 34084392 PMCID: PMC8148025 DOI: 10.1039/c9sc05307g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Specific adsorption of anions is an important aspect in surface electrochemistry for its influence on reaction kinetics in either a promoted or inhibited fashion. Perchloric acid is typically considered as an ideal electrolyte for investigating electrocatalytic reactions due to the lack of specific adsorption of the perchlorate anion on several metal electrodes. In this work, cyclic voltammetry and computational methods are combined to investigate the interfacial processes on a Pd monolayer deposited on Pt(111) single crystal electrode in perchloric acid solution. The “hydrogen region” of this PdMLPt(111) surface exhibits two voltammetric peaks: the first “hydrogen peak” at 0.246 VRHE actually involves the replacement of hydrogen by hydroxyl, and the second “hydrogen peak” HII at 0.306 VRHE appears to be the replacement of adsorbed hydroxyl by specific perchlorate adsorption. The two peaks merge into a single peak when a more strongly adsorbed anion, such as sulfate, is involved. Our density functional theory calculations qualitatively support the peak assignment and show that anions generally bind more strongly to the PdMLPt(111) surface than to Pt(111). Specific adsorption of anions is an important aspect in surface electrochemistry for its influence on reaction kinetics in either a promoted or inhibited fashion.![]()
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Affiliation(s)
- Xiaoting Chen
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
| | | | - Ian T McCrum
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
| | - Marc T M Koper
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
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Santana JA, Ishikawa Y. DFT Calculations of the Electrochemical Adsorption of Sulfuric Acid Anions on the Pt(110) and Pt(100) Surfaces. Electrocatalysis (N Y) 2019. [DOI: 10.1007/s12678-019-00574-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Sabawa JP, Bandarenka AS. Degradation mechanisms in polymer electrolyte membrane fuel cells caused by freeze-cycles: Investigation using electrochemical impedance spectroscopy. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.102] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Nishikawa H, Yano H, Inukai J, Tryk DA, Iiyama A, Uchida H. Effects of Sulfate on the Oxygen Reduction Reaction Activity on Stabilized Pt Skin/PtCo Alloy Catalysts from 30 to 80 °C. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13558-13564. [PMID: 30378419 DOI: 10.1021/acs.langmuir.8b02945] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The effects of the concentration of H2SO4 ([H2SO4]), which is the major decomposition product of polymer electrolyte membranes during the operation of fuel cells, on the performance of stabilized Pt skin/PtCo alloy nanocatalysts supported on high-surface-area carbon (PtxAL-PtCo/C) were investigated. Kinetically controlled activities for the oxygen reduction reaction (ORR) and the H2O2 yields ( P(H2O2)) on the PtxAL-PtCo/C were examined based on hydrodynamic voltammograms in O2-saturated 0.1 M HClO4 + X M H2SO4 ( X = 0 to 5 × 10-2) by use of the channel flow double electrode method at temperatures between 30 and 80 °C. At X ≤ 10-6 (1 μM) and all temperatures examined, the apparent ORR rate constants kapp@0.85 V (per unit electrochemically active surface area) on PtxAL-PtCo/C at 0.85 V vs the reversible hydrogen electrode (RHE) were nearly identical with those in sulfate-free 0.1 M HClO4 and were at least twice as high as those on a commercial Pt/C catalyst (c-Pt/C). The values of kapp@0.85 V on both PtxAL-PtCo/C and c-Pt/C decreased linearly with log[H2SO4] in the concentration range 10-6 < X ≤ 5 × 10-2. The detrimental effect by H2SO4 was less pronounced on PtxAL-PtCo/C than on c-Pt/C at high temperatures; the kapp@0.85 V value at X = 5 × 10-2 on the former at 80 °C was maintained as high as 87%, whereas that of the latter was 66% (34% loss). The values of peroxide production percentage P(H2O2) on PtxAL-PtCo/C at 80 °C were nearly constant (ca. 0.22% at 0.76 V vs RHE) up to X = 5 × 10-2. These superior characteristics are ascribed to weakened adsorption of sulfate on the Pt skin surface, supported by DFT calculations, which provides the great advantage of robustness in the presence of impurities, maintaining active sites for the ORR during the PEFC operation.
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Affiliation(s)
| | - Hiroshi Yano
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Junji Inukai
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Donald A Tryk
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Akihiro Iiyama
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
| | - Hiroyuki Uchida
- Fuel Cell Nanomaterials Center , University of Yamanashi , 6-43 Miyamae-cho , Kofu 400-0021 , Japan
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Wu CH, Pascal TA, Baskin A, Wang H, Fang HT, Liu YS, Lu YH, Guo J, Prendergast D, Salmeron MB. Molecular-Scale Structure of Electrode-Electrolyte Interfaces: The Case of Platinum in Aqueous Sulfuric Acid. J Am Chem Soc 2018; 140:16237-16244. [PMID: 30369234 DOI: 10.1021/jacs.8b09743] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Knowledge of the molecular composition and electronic structure of electrified solid-liquid interfaces is key to understanding elemental processes in heterogeneous reactions. Using X-ray absorption spectroscopy in the interface-sensitive electron yield mode (EY-XAS), first-principles electronic structure calculations, and multiscale simulations, we determined the chemical composition of the interfacial region of a polycrystalline platinum electrode in contact with aqueous sulfuric acid solution at potentials between the hydrogen and oxygen evolution reactions. We found that between 0.7 and 1.3 V vs Ag/AgCl the electrical double layer (EDL) region comprises adsorbed sulfate ions with hydrated hydronium ions in the next layer. No evidence was found for bisulfate or Pt-O/Pt-OH species, which have very distinctive spectral signatures. In addition to resolving the long-standing issue of the EDL structure, our work establishes interface- and element-sensitive EY-XAS as a powerful spectroscopic tool for studying condensed phase, buried solid-liquid interfaces relevant to various electrochemical processes and devices.
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Affiliation(s)
- Cheng Hao Wu
- Department of Chemistry , University of California , Berkeley , California 94720 , United States.,Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Tod A Pascal
- The Molecular Foundry , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Artem Baskin
- The Molecular Foundry , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Huixin Wang
- Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150080 , P. R. China
| | - Hai-Tao Fang
- Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150080 , P. R. China
| | - Yi-Sheng Liu
- The Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Yi-Hsien Lu
- Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Jinghua Guo
- The Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Chemistry and Chemical Biology , University of California, Santa Cruz , Santa Cruz , California 95064 , United States
| | - David Prendergast
- The Molecular Foundry , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Miquel B Salmeron
- Materials Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Materials Science and Engineering , University of California, Berkeley , Berkeley , California 94720 , United States
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8
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9
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Platinum overlayers on Pt Ru1−(111) electrodes: Tailoring the ORR activity by lateral strain and ligand effects. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.10.063] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Electrodeposition of Ag Overlayers onto Pt(111): Structural, Electrochemical and Electrocatalytic Properties. Electrocatalysis (N Y) 2017. [DOI: 10.1007/s12678-017-0386-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Farias MJ, Mello GA, Tanaka AA, Feliu JM. Site-specific catalytic activity of model platinum surfaces in different electrolytic environments as monitored by the CO oxidation reaction. J Catal 2017. [DOI: 10.1016/j.jcat.2016.11.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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13
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Wu CH, Weatherup RS, Salmeron MB. Probing electrode/electrolyte interfaces in situ by X-ray spectroscopies: old methods, new tricks. Phys Chem Chem Phys 2016; 17:30229-39. [PMID: 26514115 DOI: 10.1039/c5cp04058b] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Electrode/electrolyte interfaces play a vital role in various electrochemical systems, but in situ characterization of such buried interfaces remains a major challenge. Several efforts to develop techniques or to modify existing techniques to study such interfaces are showing great promise to overcome this challenge. Successful examples include electrochemical scanning tunneling microscopy (EC-STM), surface-sensitive vibrational spectroscopies, environmental transmission electron microscopy (E-TEM), and surface X-ray scattering. Other techniques such as X-ray core-level spectroscopies are element-specific and chemical-state-specific, and are being widely applied in materials science research. Herein we showcase four types of newly developed strategies to probe electrode/electrolyte interfaces in situ with X-ray core-level spectroscopies. These include the standing wave approach, the meniscus approach, and two liquid cell approaches based on X-ray photoelectron spectroscopy and soft X-ray absorption spectroscopy. These examples demonstrate that with proper modifications, many ultra-high-vacuum based techniques can be adapted to study buried electrode/electrolyte interfaces and provide interface-sensitive, element- and chemical-state-specific information, such as solute distribution, hydrogen-bonding network, and molecular reorientation. At present, each method has its own specific limitations, but all of them enable in situ and operando characterization of electrode/electrolyte interfaces that can provide important insights into a variety of electrochemical systems.
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Affiliation(s)
- Cheng Hao Wu
- Department of Chemistry, University of California, Berkeley, CA 94720, USA and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - Robert S Weatherup
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - Miquel B Salmeron
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. and Department of Materials Sciences and Engineering, University of California, Berkeley, CA 94720, USA
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14
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Effect of adsorption of sulfate anions on the activities for oxygen reduction reaction on Nafion®-coated Pt/carbon black catalysts at practical temperatures. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Tymoczko J, Colic V, Ganassin A, Schuhmann W, Bandarenka AS. Influence of the alkali metal cations on the activity of Pt(111) towards model electrocatalytic reactions in acidic sulfuric media. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.07.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Tymoczko J, Calle-Vallejo F, Colic V, Koper MTM, Schuhmann W, Bandarenka AS. Oxygen Reduction at a Cu-Modified Pt(111) Model Electrocatalyst in Contact with Nafion Polymer. ACS Catal 2014. [DOI: 10.1021/cs501037y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jakub Tymoczko
- Analytical
Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
| | - Federico Calle-Vallejo
- Laboratoire
de Chimie, ENS Lyon, Université de Lyon, CNRS, 46 Allée
d’Italie, 69364 Lyon Cedex 07, France
| | - Viktor Colic
- Analytical
Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
| | - Marc T. M. Koper
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Wolfgang Schuhmann
- Analytical
Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
| | - Aliaksandr S. Bandarenka
- Analytical
Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
- Physik-Department
ECS, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching, Germany
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17
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Qian Y, Ikeshoji T, Zhao YY, Otani M. Vibrational Dynamics of Sulfate Anion Adsorption on Pt(111) Surface: Ab Initio Molecular Dynamics Simulations. ChemElectroChem 2014. [DOI: 10.1002/celc.201402205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Surface spectroscopy of Pt(1 1 1) single-crystal electrolyte interfaces with broadband sum-frequency generation. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.10.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Tymoczko J, Schuhmann W, Bandarenka AS. Position of Cu Atoms at the Pt(111) Electrode Surfaces Controls Electrosorption of (H)SO4(2)−from H2SO4Electrolytes. ChemElectroChem 2013. [DOI: 10.1002/celc.201300107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Jinnouchi R, Hatanaka T, Morimoto Y, Osawa M. Stark effect on vibration frequencies of sulfate on Pt(111) electrode. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.12.104] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Petrii OA. Zero charge potentials of platinum metals and electron work functions (Review). RUSS J ELECTROCHEM+ 2013. [DOI: 10.1134/s1023193513050145] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yeh KY, Restaino NA, Esopi MR, Maranas JK, Janik MJ. The adsorption of bisulfate and sulfate anions over a Pt(111) electrode: A first principle study of adsorption configurations, vibrational frequencies and linear sweep voltammogram simulations. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.03.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Tymoczko J, Schuhmann W, Bandarenka AS. The constant phase element reveals 2D phase transitions in adsorbate layers at the electrode/electrolyte interfaces. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2012.11.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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24
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Bandarenka AS. Exploring the interfaces between metal electrodes and aqueous electrolytes with electrochemical impedance spectroscopy. Analyst 2013; 138:5540-54. [DOI: 10.1039/c3an00791j] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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25
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Comas-Vives A, Bandlow J, Jacob T. Ab initio study of the electrochemical H2SO4/Pt(111) interface. Phys Chem Chem Phys 2013; 15:992-7. [DOI: 10.1039/c2cp43054a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Liao LW, Li MF, Kang J, Chen D, Chen YX, Ye S. Electrode reaction induced pH change at the Pt electrode/electrolyte interface and its impact on electrode processes. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2012.08.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Jinnouchi R, Hatanaka T, Morimoto Y, Osawa M. First principles study of sulfuric acid anion adsorption on a Pt(111) electrode. Phys Chem Chem Phys 2012; 14:3208-18. [DOI: 10.1039/c2cp23172g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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28
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Korzeniewski C, Climent V, Feliu J. Electrochemistry at Platinum Single Crystal Electrodes. ELECTROANALYTICAL CHEMISTRY: A SERIES OF ADVANCES 2011. [DOI: 10.1201/b11480-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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29
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Björling A, Feliu JM. Electrochemical surface reordering of Pt(111): A quantification of the place-exchange process. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2011.01.045] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Braunschweig B, Mukherjee P, Dlott DD, Wieckowski A. Real-time investigations of Pt(111) surface transformations in sulfuric acid solutions. J Am Chem Soc 2011; 132:14036-8. [PMID: 20853845 DOI: 10.1021/ja106618z] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present the first broadband sum-frequency generation (SFG) spectra of adlayers from sulfuric acid solutions on Pt(111) surfaces and reveal surface transformations of (bi)sulfate anions in unprecedented detail. SFG amplitudes, bandwidth, and electrochemical Stark tuning of (bi)sulfate vibrational bands centered at 1250-1290 cm(-1) strongly depend on the applied potential and are correlated with prominent voltammetric features. (Bi)sulfate adlayers on Pt(111) are important model systems for weak, specific adsorption of anions on catalytically active surfaces. Although the existence of surface transformations on Pt(111) in dilute H(2)SO(4) solutions has been established by previous studies, so far they have not been observed with surface vibrational spectroscopy. Our results confirm previous reports of a surface transformation at 0.21 V and provide new information on a second transformation at 0.5 V due to surface hydroxyl formation and rearrangement of the electric double layer.
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Affiliation(s)
- Björn Braunschweig
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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32
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Strbac S. The effect of pH on oxygen and hydrogen peroxide reduction on polycrystalline Pt electrode. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2010.10.057] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Su Z, Climent V, Leitch J, Zamlynny V, Feliu JM, Lipkowski J. Quantitative SNIFTIRS studies of (bi)sulfate adsorption at the Pt(111) electrode surface. Phys Chem Chem Phys 2010; 12:15231-9. [PMID: 21046024 DOI: 10.1039/c0cp00860e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Subtractively normalized interfacial Fourier transform infrared reflection spectroscopy (SNIFTIRS) was applied to study (bi)sulfate adsorption on a Pt(111) surface in solutions of variable pH while maintaining a constant total bisulfate/sulfate ((bi)sulfate) concentration without the addition of an inert supporting electrolyte. The spectra were recorded for both the p- and s-polarizations of the IR radiation in order to differentiate between the IR bands of the (bi)sulfate species adsorbed on the electrode surface from those species located in the thin layer of electrolyte. The spectra recorded with p-polarized light consist of the IR bands from both the species adsorbed at the electrode surface and those present in the thin layer of electrolyte between the electrode surface and ZnSe window whereas the s-polarized spectra contain only the IR bands from the species located in the thin layer of electrolyte. A new procedure was developed to calculate the angle of incidence and thickness of the electrolyte between the Pt(111) electrode surface and the ZnSe IR transparent window. By combining these values with the knowledge of the optical constants for Pt, H(2)O and ZnSe, the mean square electric field strength (MSEFS) at the Pt(111) electrode surface and for thin layer of solution were accurately calculated. The spectra recorded using s-polarization were multiplied by the ratio of the average MSEFS for p- and s-polarizations and subtracted from the spectra recorded using p-polarization in order to remove the IR bands that arise from the species present within the thin layer cavity. In this manner, the resulting IR spectra contain only the IR bands for the anions adsorbed on the Pt(111) electrode surface. The spectra of adsorbed anions show little change with respect to the pH ranging from 1 to 5.6. This behavior indicates that the same species is predominantly adsorbed on the metal surface for this broad range of pH values and the results suggest that sulfate is the most likely candidate for this adsorbate.
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Affiliation(s)
- Zhangfei Su
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
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Mostany J, Climent V, Herrero E, Feliu JM. Surface excesses at very low concentrations from extrapolation of thermodynamic data: A way to explore beyond practical limits from reliable experimental data. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.02.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Wolfschmidt H, Weingarth D, Stimming U. Enhanced Reactivity for Hydrogen Reactions at Pt Nanoislands on Au(111). Chemphyschem 2010; 11:1533-41. [DOI: 10.1002/cphc.201000148] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Garcia-Araez N, Climent V, Rodriguez P, Feliu JM. Thermodynamic evidence for K+–SO42− ion pair formation on Pt(111). New insight into cation specific adsorption. Phys Chem Chem Phys 2010; 12:12146-52. [DOI: 10.1039/c0cp00247j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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