1
|
Zhang MK, Chen W, Wei Z, Xu ML, He Z, Cai J, Chen YX, Santos E. Mechanistic Implication of the pH Effect and H/D Kinetic Isotope Effect on HCOOH/HCOO – Oxidation at Pt Electrodes: A Study by Computer Simulation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01035] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Meng-Ke Zhang
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Wei Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Zhen Wei
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Mian-Le Xu
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - ZhengDa He
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Jun Cai
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yan-Xia Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Elizabeth Santos
- Institute of Theoretical Chemistry, Ulm University, Ulm 89069, Germany
| |
Collapse
|
2
|
Lee H, Liao ZH, Hsu PW, Hung TC, Wu YC, Lin Y, Wang JH, Luo MF. Surface structures and compositions of Au–Rh bimetallic nanoclusters supported on thin-film Al2O3/NiAl(100) probed with CO. J Chem Phys 2017; 147:044704. [DOI: 10.1063/1.4995598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Hsuan Lee
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Zhen-He Liao
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Po-Wei Hsu
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Ting-Chieh Hung
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Yu-Cheng Wu
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| | - Yuwei Lin
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Jeng-Han Wang
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Meng-Fan Luo
- Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
| |
Collapse
|
3
|
Simple synthesis of Pt-Ag/SnO2-C for use as a catalyst of methanol oxidation in alkaline media. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3567-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
4
|
Hsu PW, Liao ZH, Hung TC, Lee H, Wu YC, Lai YL, Hsu YJ, Lin Y, Wang JH, Luo MF. Formation and structures of Au–Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). Phys Chem Chem Phys 2017; 19:14566-14579. [DOI: 10.1039/c7cp02524f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystallinity, orientation, and lattice parameters of Au–Rh bimetallic clusters on Al2O3/NiAl(100) are revealed and dominated by Rh.
Collapse
Affiliation(s)
- Po-Wei Hsu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Zhen-He Liao
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Ting-Chieh Hung
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Hsuan Lee
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Yu-Cheng Wu
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yuwei Lin
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Jeng-Han Wang
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Meng-Fan Luo
- Department of Physics
- National Central University
- Taoyuan 32001
- Taiwan
| |
Collapse
|
5
|
Hung TC, Liao TW, Liao ZH, Hsu PW, Cai PY, Lee H, Lai YL, Hsu YJ, Chen HY, Wang JH, Luo MF. Dependence on Size of Supported Rh Nanoclusters in the Decomposition of Methanol. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00579] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting-Chieh Hung
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Ting-Wei Liao
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Zhen-He Liao
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Po-Wei Hsu
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Pei-Yang Cai
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Hsuan Lee
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| | - Yu-Ling Lai
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science
Park, Hsinchu 30076, Taiwan
| | - Yao-Jane Hsu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science
Park, Hsinchu 30076, Taiwan
| | - Hui-Yu Chen
- Department
of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Jeng-Han Wang
- Department
of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Meng-Fan Luo
- Department
of Physics, National Central University, 300 Jhongda Road, Jhongli 32001, Taiwan
| |
Collapse
|
6
|
Monzó J, Malewski Y, Vidal-Iglesias FJ, Solla-Gullon J, Rodriguez P. Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation. ChemElectroChem 2015. [DOI: 10.1002/celc.201500084] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
7
|
Okamoto H, Numata Y, Gojuki T, Mukouyama Y. Different behavior of adsorbed bridge-bonded formate from that of current in the oxidation of formic acid on platinum. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.11.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
8
|
Rodriguez P, Kwon Y, Koper MTM. The promoting effect of adsorbed carbon monoxide on the oxidation of alcohols on a gold catalyst. Nat Chem 2011; 4:177-82. [DOI: 10.1038/nchem.1221] [Citation(s) in RCA: 218] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 11/03/2011] [Indexed: 11/09/2022]
|
9
|
|
10
|
Bianchini C, Shen PK. Palladium-Based Electrocatalysts for Alcohol Oxidation in Half Cells and in Direct Alcohol Fuel Cells. Chem Rev 2009; 109:4183-206. [DOI: 10.1021/cr9000995] [Citation(s) in RCA: 1320] [Impact Index Per Article: 88.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Claudio Bianchini
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy, and The State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| | - Pei Kang Shen
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy, and The State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| |
Collapse
|
11
|
Cuesta A, Escudero M, Lanova B, Baltruschat H. Cyclic voltammetry, FTIRS, and DEMS study of the electrooxidation of carbon monoxide, formic acid, and methanol on cyanide-modified Pt(111) electrodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:6500-6507. [PMID: 19466794 DOI: 10.1021/la8041154] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have used cyanide-modified Pt(111) electrodes, in combination with cyclic voltammetry (CV), Fourier transform infrared spectroscopy (FTIRS), and differential electrochemical mass spectrometry (DEMS), to investigate the oxidation of formic acid and methanol on Pt electrodes. Since CO is the poison intermediate formed during the oxidation of both formic acid and methanol, we have previously characterized the CO adlayer on cyanide-modified Pt(111) electrodes. Poison formation on cyanide-modified Pt(111) is nearly completely inhibited in the case of formic acid and methanol, the corresponding electro-oxidation reaction proceeding, hence, exclusively through the reactive intermediate pathway. These results suggest that, in the oxidation of formic acid and methanol, the formation of adsorbed CO would require the presence of at least three contiguous Pt atoms.
Collapse
Affiliation(s)
- Angel Cuesta
- Instituto de Química Física Rocasolano, CSIC, C. Serrano 119, E-28006 Madrid, Spain.
| | | | | | | |
Collapse
|
12
|
Gao W, Zhao M, Jiang Q. Pathways for the Non-CO-Involved Oxidation of Methanol on Pt(111). Chemphyschem 2008; 9:2092-8. [DOI: 10.1002/cphc.200800150] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
13
|
|
14
|
Xue XK, Wang JY, Li QX, Yan YG, Liu JH, Cai WB. Practically modified attenuated total reflection surface-enhanced IR absorption spectroscopy for high-quality frequency-extended detection of surface species at electrodes. Anal Chem 2007; 80:166-71. [PMID: 18041822 DOI: 10.1021/ac7017487] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A practically modified ATR configuration has been proposed for in situ electrochemical surface-enhanced IR absorption spectroscopy (SEIRAS) by sandwiching an ultrathin water interlayer between a hemicylindrical ZnSe prism and a Si wafer as an integrated window. This new ATR optics significantly enhances the throughput of an effective IR beam across the ZnSe/gap/Si/metal film, enabling high-quality spectral fingerprints down to 700 cm(-1) to be readily detected at larger incidence angles without compromising the electrochemical feasibility and stability of metallic films deposited on Si. The advantages of this modified ATR-SEIRAS have been initially applied to explore two selected systems: wide-ranged in situ ATR-SEIRA spectra provided strong evidence in support of the formate intermediate pathway for methanol electrooxidation at the Pt electrode in an acid solution; in addition, new spectral fingerprints revealed comprehensive orientational information about of the p-nitrobenzoate species at Pt electrode as a result of the dissociative adsorption of p-nitrobenzoic acid molecules from an acid solution.
Collapse
Affiliation(s)
- Xiao-Kang Xue
- Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials, and Department of Chemistry, Fudan University, Shanghai 200433, China
| | | | | | | | | | | |
Collapse
|
15
|
Electrochemical behaviour of benzylamine, 2-phenylethylamine and 4-hydroxyphenylethylamine at gold. A comparative study. J APPL ELECTROCHEM 2007. [DOI: 10.1007/s10800-007-9396-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
16
|
|
17
|
Surface metal modifiers for methanol electrooxidation on platinum; silver and mercury. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0289-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
18
|
Chen YX, Heinen M, Jusys Z, Behm RJ. Bridge-bonded formate: active intermediate or spectator species in formic acid oxidation on a Pt film electrode? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10399-408. [PMID: 17129008 DOI: 10.1021/la060928q] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We present and discuss the results of an in situ IR study on the mechanism and kinetics of formic acid oxidation on a Pt film/Si electrode, performed in an attenuated total reflection (ATR) flow cell configuration under controlled mass transport conditions, which specifically aimed at elucidating the role of the adsorbed bridge-bonded formates in this reaction. Potentiodynamic measurements show a complex interplay between formation and desorption/oxidation of COad and formate species and the total Faradaic current. The notably faster increase of the Faradaic current compared to the coverage of bridge-bonded formate in transient measurements at constant potential, but with different formic acid concentrations, reveals that adsorbed formate decomposition is not rate-limiting in the dominant reaction pathway. If being reactive intermediate at all, the contribution of formate adsorption/decomposition to the reaction current decreases with increasing formic acid concentration, accounting for at most 15% for 0.2 M DCOOH at 0.7 VRHE. The rapid build-up/removal of the formate adlayer and its similarity with acetate or (bi-)sulfate adsorption/desorption indicate that the formate adlayer coverage is dominated by a fast dynamic adsorption-desorption equilibrium with the electrolyte, and that formate desorption is much faster than its decomposition. The results corroborate the proposal of a triple pathway reaction mechanism including an indirect pathway, a formate pathway, and a dominant direct pathway, as presented previously (Chen, Y. X.; et al. Angew. Chem. Int. Ed. 2006, 45, 981), in which adsorbed formates act as a site-blocking spectator in the dominant pathway rather than as an active intermediate.
Collapse
Affiliation(s)
- Y-X Chen
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany.
| | | | | | | |
Collapse
|
19
|
Structure––reactivity relationships: the oxidation of aliphatic amines on the gold electrode. J APPL ELECTROCHEM 2006. [DOI: 10.1007/s10800-006-9253-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
20
|
Chen YX, Ye S, Heinen M, Jusys Z, Osawa M, Behm RJ. Application of In-situ Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy for the Understanding of Complex Reaction Mechanism and Kinetics: Formic Acid Oxidation on a Pt Film Electrode at Elevated Temperatures. J Phys Chem B 2006; 110:9534-44. [PMID: 16686500 DOI: 10.1021/jp057463h] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The potential of in-situ Fourier transform infrared (FTIR) spectroscopy measurements in an attenuated total reflection configuration (ATR-FTIRS) for the evaluation of reaction pathways, elementary reaction steps, and their kinetics is demonstrated for formic acid electrooxidation on a Pt film electrode. Quantitative kinetic information on two elementary steps, formic acid dehydration and CO(ad) oxidation, and on the contributions of the related pathways in the dual path reaction mechanism are derived from IR spectroscopic signals in simultaneous electrochemical and ATR-FTIRS measurements over a wide temperature range (25-80 degrees C). Linearly and multiply bonded CO(ad) and bridge-bonded formate are the only formic acid related stable reaction intermediates detected. With increasing temperature, the steady-state IR signal of CO(ad) increases, while that of formate decreases. Reaction rates for CO(ad) formation via formic acid dehydration and for CO(ad) oxidation as well as the activation energies of these processes were determined at different temperatures, potentials, and surface conditions (with and without preadsorbed CO from formic acid dehydration) from the temporal evolution of the IR intensities of CO(ad) during adsorption/reaction transients, using an IR intensity-CO(ad) coverage calibration. At potentials up to 0.75 V and temperatures from 25 to 80 degrees C, the "indirect" CO pathway contributes less than 5% (at potentials < or =0.6 V significantly below 1%) to the total Faradaic reaction current, making the "direct" pathway by far the dominant one under the present reaction conditions. Much higher activation energies for CO(ad) formation and CO(ad) oxidation compared with the effective activation energy of the total reaction, derived from the Faradaic currents, support this conclusion.
Collapse
Affiliation(s)
- Yan Xia Chen
- Department Surface Chemistry and Catalysis, University of Ulm, D-89069 Ulm, Germany.
| | | | | | | | | | | |
Collapse
|
21
|
Xu W, Lu T, Liu C, Xing W. Supplement to the Theory of Normal Pulse Voltammetry and Its Application to the Kinetic Study of Methanol Oxidation on a Polycrystalline Platinum Electrode. J Phys Chem B 2005; 109:7872-7. [PMID: 16851917 DOI: 10.1021/jp0444058] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The theory of normal pulse voltammetry (NPV) for complex multistep multielectron transfer processes on a plane electrode was advanced and applied to the completely irreversible process of methanol oxidation to formic acid in the potential range from 0.3 to 0.8 V versus Ag/AgCl. The kinetic parameters for this process, such as the standard rate constant (k0) and anodic transfer coefficient (alpha) for this irreversible heterogeneous electron transfer process at the electrode/solution interface and apparent diffusion coefficient (D(app)) for the homogeneous charge transfer process within liquid film near the electrode surface, were obtained with NPV theory from analyzing the dependence of current-potential curves upon the sampling times. The results showed that this process is truly a very slow, completely irreversible kinetic process, as k0 is in the order of 10(-9) cm/s for the rate-determining step. The values of k0 and D(app) decreased with the increase of methanol concentration, while alpha was independent of the concentration of methanol and its value was 0.35 +/- 0.05. Theoretical fitting is very consistent with the experimental data.
Collapse
Affiliation(s)
- Weilin Xu
- State Key Laboratory of Electro-analytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, Jilin, People's Republic of China
| | | | | | | |
Collapse
|
22
|
Oscillatory electrocatalytic oxidation of methanol on an Ni(OH)2 film electrode. J Solid State Electrochem 2005. [DOI: 10.1007/s10008-004-0599-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
23
|
Dimakis N, Iddir H, Díaz-Morales RR, Liu R, Bunker G, Chung EH, Smotkin ES. A Band Dispersion Mechanism for Pt Alloy Compositional Tuning of Linear Bound CO Stretching Frequencies. J Phys Chem B 2005; 109:1839-48. [PMID: 16851166 DOI: 10.1021/jp046332y] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The C-O stretching frequency (nu(CO)) of atop CO/Pt in PtRu alloys is compositionally tuned in proportion to the Pt mole percent. The application of a Blyholder-Bagus type mechanism (i.e., increased back-donation from the metal d-band to the hybridized 2pi CO molecular orbitals (MOs)) to compositional tuning has been paradoxical because (1) a Pt-C bond contraction, expected with increased back-donation as the Pt mole percent is reduced, is not observed (i.e., calculated Pt-C bond is either elongated or insensitive to alloying and the binding energies of CO/Pt decrease with alloying) and (2) the lowering d-band center and increased d-band vacancies upon alloying (suggesting less back-donation to the higher energy metal hybridized 2pi CO MOs) must be reconciled with the alloy-induced red shift of the nu(CO). A library of spin-optimized Pt and Pt alloy clusters was the basis of density functional theory (DFT) calculations of CO binding energies, nu(CO) values, shifts, and broadening of 5sigma/2pi CO MO upon hybridization with the alloy orbitals and a DFT derived Mulliken electron population analysis. The DFT results, combined with FEFF8 local density of states (LDOS) calculations, validate a 5sigma donation-2pi back-donation mechanism, reconciling the direction of alloy compositional tuning with the lowering of the d-band center and increased vacancies. Although the d-band center decreases in energy with alloying, an asymmetric increase in the dispersion of the d-band is accompanied by an upshift of the metal cluster HOMO level. Concomitantly, the hybridization and renormalization of the CO 5sigma/2pi states results in a broadening of the 5sigma/2pi manifold with additional lower energy states closer to the upshifted (with respect to the pure Pt cluster) HOMO of the alloy cluster. The dispersion toward higher energies of the alloy d-density of states results in more 5sigma/2pi CO filled states (i.e., enhanced 2pi-back-donation). Finally, Mulliken and FEFF8 electron population analysis shows that the increase of the average d-band vacancies upon alloying and additional 2pi back-donation are not mutually exclusive. The d-electron density of the CO-adsorbed Pt atom increases with alloying while the average d-electron density throughout the cluster is reduced. The localized electron density is manifested as an electrostatic wall effect, preventing the Pt-C bond contractions expected with increased back-donation to the 2pi CO MOs.
Collapse
Affiliation(s)
- Nicholas Dimakis
- Department of Physics and Geology, University of Texas-Pan American, Edinburg, Texas 78541, USA
| | | | | | | | | | | | | |
Collapse
|
24
|
Pacheco Santos V, Del Colle V, Batista de Lima R, Tremiliosi-Filho G. FTIR study of the ethanol electrooxidation on Pt(100) modified by osmium nanodeposits. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:11064-11072. [PMID: 15568859 DOI: 10.1021/la040001v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In the present work, ethanol electrooxidation on a Pt(100) electrode modified by different coverage degrees of osmium nanoislands obtained by spontaneous depositions, was extensively studied employing in situ FTIR spectroscopy. A collection of spectra of the ethanol adsorption and oxidation processes was acquired during the first series of a positive potential step, to determine the intermediate species, as well as the main products formed. The spectroscopic results obtained were correlated with conventional electrochemical results obtained by cyclic voltammetry. It was shown that the catalytic activity of Pt(100) for ethanol oxidation increases significantly after osmium deposition and that the mechanistic pathway for this reaction depends directly on the osmium coverage degree. Thus, for low osmium coverage (theta;( Os) up to 0.15) the formation of CO as an intermediate was favored and hence the full oxidation of adsorbed ethanol to CO(2) was increased. For higher osmium coverages (theta;(Os) up to 0.33), the higher the coverage is, the more the direct ethanol oxidation to acetaldehyde and acetic acid is favored. For osmium coverage degree of 0.40, the catalytic activity of the electrode for ethanol oxidation decreased. On an almost complete osmium layer (theta;(Os) = 0.92) obtained by electrodeposition at 50 mV vs reversible hydrogen electrode, the catalytic activity for ethanol oxidation shows a much lower value.
Collapse
Affiliation(s)
- V Pacheco Santos
- Instituto de Química de São Carlos-USP, CP 780, 13560-970, São Carlos, SP, Brazil
| | | | | | | |
Collapse
|
25
|
|
26
|
Affiliation(s)
- Tamas Mallat
- Institute for Chemical and Bioengineering, Swiss Federal Institute of Technology, ETH Hönggerberg, HCI, CH-8093 Zurich, Switzerland.
| | | |
Collapse
|
27
|
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]
|
28
|
Lin XF, Ren B, Tian ZQ. Electrochemical and Surface-Enhanced Raman Spectroscopic Studies on the Adsorption and Electrooxidation of C1 Molecules on a Roughened Rh Electrode. J Phys Chem B 2003. [DOI: 10.1021/jp035433d] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xu-Feng Lin
- Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Bin Ren
- Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| | - Zhong-Qun Tian
- Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
| |
Collapse
|
29
|
Chen YX, Miki A, Ye S, Sakai H, Osawa M. Formate, an active intermediate for direct oxidation of methanol on pt electrode. J Am Chem Soc 2003; 125:3680-1. [PMID: 12656581 DOI: 10.1021/ja029044t] [Citation(s) in RCA: 265] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electro-oxidation of methanol on a Pt thin film electrode in acidic solution has been investigated by in situ surface-enhanced IR absorption spectroscopy. A new IR peak is observed at around 1320 cm-1 when the electrode potential is more positive than 0.5 V, where the bulk oxidation of MeOH occurs. This peak has been assigned to the symmetric stretching of formate species adsorbed on the Pt electrode surface. It is the first observation of formate adsorption during the electro-oxidation of methanol on a Pt surface. A near proportional relationship between the intensity of the IR band of the formate species and MeOH electro-oxidation current is observed. A new reaction scheme via non-CO pathway with formate as the active intermediate is proposed for the methanol electro-oxidation process.
Collapse
Affiliation(s)
- Yan Xia Chen
- Catalysis Research Center, Hokkaido University, Sapporo 060-0811, Japan
| | | | | | | | | |
Collapse
|
30
|
|
31
|
Lezna RO, Romagnoli R, de Tacconi NR, Rajeshwar K. Cobalt Hexacyanoferrate: Compound Stoichiometry, Infrared Spectroelectrochemistry, and Photoinduced Electron Transfer. J Phys Chem B 2002. [DOI: 10.1021/jp013991r] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
32
|
Korzeniewski C, Kardash D. Use of a Dynamic Monte Carlo Simulation in the Study of Nucleation-and-Growth Models for CO Electrochemical Oxidation. J Phys Chem B 2001. [DOI: 10.1021/jp0114788] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Carol Korzeniewski
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061
| | - Dawn Kardash
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061
| |
Collapse
|
33
|
Kardash D, Korzeniewski C, Markovic N. Effects of thermal activation on the oxidation pathways of methanol at bulk Pt–Ru alloy electrodes. J Electroanal Chem (Lausanne) 2001. [DOI: 10.1016/s0022-0728(00)00303-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
34
|
Yoshizawa K, Kagawa Y. Reaction Pathways for the Oxidation of Methanol to Formaldehyde by an Iron−Oxo Species. J Phys Chem A 2000. [DOI: 10.1021/jp0012552] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazunari Yoshizawa
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yoshihisa Kagawa
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| |
Collapse
|
35
|
|
36
|
|
37
|
Lu GQ, Crown A, Wieckowski A. Formic Acid Decomposition on Polycrystalline Platinum and Palladized Platinum Electrodes. J Phys Chem B 1999. [DOI: 10.1021/jp992297x] [Citation(s) in RCA: 240] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guo-Qiang Lu
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Alechia Crown
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Andrzej Wieckowski
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| |
Collapse
|
38
|
Screening effects in surface infrared spectra of CO adsorbed on electrodes: application to isothermal desorption measurements. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(99)00391-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
39
|
Selective electrocatalytic oxidation of 2,5-dihydroxymethylfuran in aqueous medium: a chromatographic analysis of the reaction products. Electrochim Acta 1999. [DOI: 10.1016/s0013-4686(99)00006-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
40
|
Melendres C, Hahn F. ‘In-situ’ observation of halide ion adsorption on a gold electrode using synchrotron far infrared spectroscopy. J Electroanal Chem (Lausanne) 1999. [DOI: 10.1016/s0022-0728(98)00457-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
41
|
Gurau B, Viswanathan R, Liu R, Lafrenz TJ, Ley KL, Smotkin ES, Reddington E, Sapienza A, Chan BC, Mallouk TE, Sarangapani S. Structural and Electrochemical Characterization of Binary, Ternary, and Quaternary Platinum Alloy Catalysts for Methanol Electro-oxidation. J Phys Chem B 1998. [DOI: 10.1021/jp982887f] [Citation(s) in RCA: 350] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
42
|
Proença L, Lopes M, Fonseca I, Hahn F, Lamy C. An in situ IR reflectance spectroscopic study of the electro-oxidation of d-sorbitol on platinum. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(98)00265-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
43
|
Ethylene glycol electrochemical oxidation at platinum probed by ion chromatography and infrared spectroscopy. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(98)00217-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
44
|
On the oxidation of d-sorbitol on platinum single crystal electrodes: a voltammetric and in situ FTIRS study. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(98)00341-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
45
|
On the oxidation of d-sorbitol on platinum single crystal electrodes: a voltammetric and in situ FTIRS study. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(98)00219-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
46
|
|
47
|
Tripković A, Popović K, Momčilović J, Dražić D. Kinetic and mechanistic study of methanol oxidation on a Pt(100) surface in alkaline media. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(97)00141-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
48
|
Use of sensitivity analysis methods in the modelling of electrochemical transients. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(97)00599-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
49
|
Sadkowski A. Large signal (global) analysis of non-linear response of electrocatalytic reaction. I. Multiple steady states. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(98)00014-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
50
|
Electro-oxidation of ethanol on gold: analysis of the reaction products and mechanism. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(97)00536-6] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|