CO monolayer oxidation at Pt(1 0 0) probed by potential step measurements in comparison to Pt(1 1 1) and Pt nanoparticle catalyst

Prachak Inkaew; Wei Zhou; Carol Korzeniewski

doi:10.1016/j.jelechem.2007.11.028

CO monolayer oxidation at Pt(1 0 0) probed by potential step measurements in comparison to Pt(1 1 1) and Pt nanoparticle catalyst

Prachak Inkaew, Wei Zhou, Carol Korzeniewski

Chemistry and Biochemistry

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

The oxidation of CO adsorbed to high coverage on Pt(1 0 0) electrodes in 0.5 M H₂SO₄ is investigated through comparative measurements with Pt(1 1 1). In potential step experiments, current-time transients recorded during CO oxidation on Pt(1 1 1) display the same peak times and adherence to a Langmuir-Hinshelwood (LH) model for adsorbed CO electrochemical oxidation as literature benchmarks. For potentials in the vicinity of 0.8-0.9 V (versus a reversible hydrogen electrode reference), CO oxidation was faster on ordered Pt(1 0 0) electrodes than on Pt(1 1 1), and responses for ordered Pt(1 0 0) were close to, but somewhat more complicated than those predicted by the LH model. On Pt(1 0 0) with defects intentionally introduced by eliminating H₂ gas from the cooling atmosphere, current-time transients recorded during CO monolayer oxidation showed tailing at long times and responses similar to those for the reaction over nanometer-scale (<10 nm) Pt catalyst particles. The kinetics for CO monolayer oxidation on Pt(1 0 0) is discussed in terms of properties of Pt(1 0 0)-(1 × 1) islands and possible changes in island size with electrode treatment.

Original language	English
Pages (from-to)	93-100
Number of pages	8
Journal	Journal of Electroanalytical Chemistry
Volume	614
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jelechem.2007.11.028
State	Published - Mar 15 2008

Keywords

CO oxidation
Platinum
Pt(1 0 0)
Pt(1 1 1)
Single crystal electrode

Access to Document

10.1016/j.jelechem.2007.11.028

Cite this

@article{7ca4f7a1a95b4fad8c600762c8a25713,

title = "CO monolayer oxidation at Pt(1 0 0) probed by potential step measurements in comparison to Pt(1 1 1) and Pt nanoparticle catalyst",

abstract = "The oxidation of CO adsorbed to high coverage on Pt(1 0 0) electrodes in 0.5 M H2SO4 is investigated through comparative measurements with Pt(1 1 1). In potential step experiments, current-time transients recorded during CO oxidation on Pt(1 1 1) display the same peak times and adherence to a Langmuir-Hinshelwood (LH) model for adsorbed CO electrochemical oxidation as literature benchmarks. For potentials in the vicinity of 0.8-0.9 V (versus a reversible hydrogen electrode reference), CO oxidation was faster on ordered Pt(1 0 0) electrodes than on Pt(1 1 1), and responses for ordered Pt(1 0 0) were close to, but somewhat more complicated than those predicted by the LH model. On Pt(1 0 0) with defects intentionally introduced by eliminating H2 gas from the cooling atmosphere, current-time transients recorded during CO monolayer oxidation showed tailing at long times and responses similar to those for the reaction over nanometer-scale (<10 nm) Pt catalyst particles. The kinetics for CO monolayer oxidation on Pt(1 0 0) is discussed in terms of properties of Pt(1 0 0)-(1 × 1) islands and possible changes in island size with electrode treatment.",

keywords = "CO oxidation, Platinum, Pt(1 0 0), Pt(1 1 1), Single crystal electrode",

author = "Prachak Inkaew and Wei Zhou and Carol Korzeniewski",

note = "Funding Information: We thank Prof. Juan Feliu and his research group for guidance in performing single crystal electrochemistry measurements, Prof. Marc Koper and Dr. Natalia Lebedeva for helpful discussions concerning mean field models of CO electrochemistry and Dr. Nenad Markovic for sharing insights into Pt(1 0 0) and CO electrochemistry. We are grateful to the US National Science Foundation (CHE-0203116) and the US Department of Energy (DE-FG02-05ER46234) for support. ",

year = "2008",

month = mar,

day = "15",

doi = "10.1016/j.jelechem.2007.11.028",

language = "English",

volume = "614",

pages = "93--100",

journal = "Journal of Electroanalytical Chemistry",

issn = "1572-6657",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - CO monolayer oxidation at Pt(1 0 0) probed by potential step measurements in comparison to Pt(1 1 1) and Pt nanoparticle catalyst

AU - Inkaew, Prachak

AU - Zhou, Wei

AU - Korzeniewski, Carol

N1 - Funding Information: We thank Prof. Juan Feliu and his research group for guidance in performing single crystal electrochemistry measurements, Prof. Marc Koper and Dr. Natalia Lebedeva for helpful discussions concerning mean field models of CO electrochemistry and Dr. Nenad Markovic for sharing insights into Pt(1 0 0) and CO electrochemistry. We are grateful to the US National Science Foundation (CHE-0203116) and the US Department of Energy (DE-FG02-05ER46234) for support.

PY - 2008/3/15

Y1 - 2008/3/15

N2 - The oxidation of CO adsorbed to high coverage on Pt(1 0 0) electrodes in 0.5 M H2SO4 is investigated through comparative measurements with Pt(1 1 1). In potential step experiments, current-time transients recorded during CO oxidation on Pt(1 1 1) display the same peak times and adherence to a Langmuir-Hinshelwood (LH) model for adsorbed CO electrochemical oxidation as literature benchmarks. For potentials in the vicinity of 0.8-0.9 V (versus a reversible hydrogen electrode reference), CO oxidation was faster on ordered Pt(1 0 0) electrodes than on Pt(1 1 1), and responses for ordered Pt(1 0 0) were close to, but somewhat more complicated than those predicted by the LH model. On Pt(1 0 0) with defects intentionally introduced by eliminating H2 gas from the cooling atmosphere, current-time transients recorded during CO monolayer oxidation showed tailing at long times and responses similar to those for the reaction over nanometer-scale (<10 nm) Pt catalyst particles. The kinetics for CO monolayer oxidation on Pt(1 0 0) is discussed in terms of properties of Pt(1 0 0)-(1 × 1) islands and possible changes in island size with electrode treatment.

AB - The oxidation of CO adsorbed to high coverage on Pt(1 0 0) electrodes in 0.5 M H2SO4 is investigated through comparative measurements with Pt(1 1 1). In potential step experiments, current-time transients recorded during CO oxidation on Pt(1 1 1) display the same peak times and adherence to a Langmuir-Hinshelwood (LH) model for adsorbed CO electrochemical oxidation as literature benchmarks. For potentials in the vicinity of 0.8-0.9 V (versus a reversible hydrogen electrode reference), CO oxidation was faster on ordered Pt(1 0 0) electrodes than on Pt(1 1 1), and responses for ordered Pt(1 0 0) were close to, but somewhat more complicated than those predicted by the LH model. On Pt(1 0 0) with defects intentionally introduced by eliminating H2 gas from the cooling atmosphere, current-time transients recorded during CO monolayer oxidation showed tailing at long times and responses similar to those for the reaction over nanometer-scale (<10 nm) Pt catalyst particles. The kinetics for CO monolayer oxidation on Pt(1 0 0) is discussed in terms of properties of Pt(1 0 0)-(1 × 1) islands and possible changes in island size with electrode treatment.

KW - CO oxidation

KW - Platinum

KW - Pt(1 0 0)

KW - Pt(1 1 1)

KW - Single crystal electrode

UR - http://www.scopus.com/inward/record.url?scp=39649095617&partnerID=8YFLogxK

U2 - 10.1016/j.jelechem.2007.11.028

DO - 10.1016/j.jelechem.2007.11.028

M3 - Article

AN - SCOPUS:39649095617

SN - 1572-6657

VL - 614

SP - 93

EP - 100

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

IS - 1-2

ER -

CO monolayer oxidation at Pt(1 0 0) probed by potential step measurements in comparison to Pt(1 1 1) and Pt nanoparticle catalyst

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this