Effects of adsorbed CO on hydrogen ionization and CO oxidation reactions at Pt single-crystal electrodes in acidic solution

Kita, Hideaki; Naohara, Hideo; Nakato, Teruyuki; Taguchi, Satoshi; Aramata, Akiko

doi:10.1016/0022-0728(94)03813-i

Cited by 54 publications

(45 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plateau current is due to diffusion-limited mass transfer of dissolved CO in 0.1 M HClO 4 to the Pt surface. The major structure of the CV observed in 100% CO-saturated 0.1 M HClO 4 is similar to those reported on polycrystalline [2] and Pt single crystal electrodes [1,2,5,6]. Fig.…”

Section: Measurementssupporting

confidence: 77%

“…The mechanism of the electrochemical oxidation of CO dissolved in bulk electrolyte solution on Pt catalysts has been studied extensively [1][2][3]. The understanding of the nature of CO adsorbates in CO-saturated solutions has been developed by applying in situ infrared reflection-absorption (IRAS) [4][5][6] and sum frequency generation (SFG) [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode

Hanawa

Kunimatsu

Uchida

et al. 2009

Electrochimica Acta

View full text Add to dashboard Cite

Section: Measurementssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode

Hanawa

Kunimatsu

Uchida

et al. 2009

Electrochimica Acta

View full text Add to dashboard Cite

“…Studies of this reaction on single crystal Pt surfaces have shown that it is very structure sensitive. [26,31,33,[36][37][38][39] The results presented above ( Figure 2) and from earlier work [5,[48][49][50] show that cyclic voltammetry of the H 1 mesoporous Pt films after repeated oxidation and reduction cycles in acid is identical to that for polycrystalline Pt showing that the insides of the pores in the H 1 mesoporous Pt structure are made up of low-index (111), (100) and (110) face. In contrast, the CO stripping voltammograms show significant differences between the H 1 mesoporous Pt and polycrystalline Pt.…”

Section: Discussionsupporting

confidence: 51%

“…As has been recently reported, the voltammograms obtained for stripping of a monolayer of adsorbed carbon monoxide can provide further insights regarding the crystalline surface structure of platinum electrodes [26,31,33,[36][37][38][39][40] . Figure 3 shows a CO stripping voltammogram for a polished polycrystalline platinum disc electrode recorded in 1 m H 2 SO 4 .…”

Section: Deposition Of Mesoporous Platinum Filmsmentioning

confidence: 96%

Study of Carbon Monoxide Oxidation on Mesoporous Platinum

2010

View full text Add to dashboard Cite

H(1) mesoporous platinum surfaces formed by electrodeposition from lyotropic liquid crystalline templates have high electroactive surface areas (up to 60 m(2) g(-1)) provided by the concave surface within their narrow (≈2 nm diameter) pores. In this respect, they are fundamentally different from the flat surfaces of ordinary Pt electrodes or the convex surfaces of high-surface-area Pt nanoparticles. Cyclic voltammetry of H(1) mesoporous Pt films in acid solution is identical to that for polycrystalline Pt, suggesting that the surfaces of the pores are made up of low-index Pt faces. In contrast, CO stripping voltammetry on H(1) mesoporous Pt is significantly different from the corresponding voltammetry on polycrystalline Pt and shows a clear prewave for CO oxidation and the oxidation CO at lower overpotential. These differences in CO stripping are related to the presence of trough sites where the low-index Pt faces that make up the concave surface of the pore walls meet.

show abstract

“…It is now well established that CO oxidation in the pre-peak region (including diffusion-limited oxidation of dissolved CO in CO-containing solutions) can only occur if the electrode potential is kept within the hydrogen adsorption region during CO adsorption [7,8,10,11,31,[33][34][35][36]. However, a definitive explanation for this behaviour is still lacking.…”

Section: Long-range Order Of High-coverage Co Adlayersmentioning

confidence: 95%

The Oxidation of Adsorbed CO on Pt(100) Electrodes in the Pre-peak Region

Cuesta

2010

Electrocatal

View full text Add to dashboard Cite

The oxidation of CO adsorbed on Pt(100) electrodes in the pre-peak region (between 0.30 and 0.60 V) was studied using cyclic voltammetry, currenttime transients and Fourier transform infrared spectroscopy. According to our results, the pre-peak corresponds to the oxidation of a small fraction (<15%) of the CO adlayer, adsorbed on the terraces and adjacent to the step sites, the rate of CO oxidation being limited, within this potential region and at these high CO coverages, by the diffusion of CO to the reactive sites. The picture emerging from the results reported is as follows: the reaction is initiated by a one-dimensional nucleation-and-growth oxidation of CO ads along the steps, immediately followed by surface diffusioncontrolled oxidation of CO ads diffusing from the terraces to the steps and by a two-dimensional nucleation-and-growth process. The analysis of the Tafel slopes, as obtained from cyclic voltammograms at different scan rates and from plots of the logarithm of the current at the maximum, the time at the current maximum and the current at the minimum vs. the potential, suggests that the two-dimensional nucleationand-growth process occurs more slowly than the other two processes. Only the process responsible for the twodimensional nucleation and growth has not been clearly identified, although two possibilities are given.

show abstract

Effects of adsorbed CO on hydrogen ionization and CO oxidation reactions at Pt single-crystal electrodes in acidic solution

Cited by 54 publications

References 25 publications

In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode

In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode

Study of Carbon Monoxide Oxidation on Mesoporous Platinum

The Oxidation of Adsorbed CO on Pt(100) Electrodes in the Pre-peak Region

Contact Info

Product

Resources

About