Methanol Oxidation Activities of Pt Oxide Thin Films Prepared by Reactive Sputtering

Taguchi, Masami; Nakayama, Jun‐ichi; Itou, Kunihiro; Nagai, Norihito

doi:10.5188/ijsmer.17.15

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The former peak was attributed to the binding energy of 71.3 eV for metallic Pt and the latter was close to the binding energy of 72.3 eV for PtO. 10,15,16) In addition, the latter intensity was considerably weaker than the former one. Therefore, it was estimated that the thin film produced in the 100% Ar plasma was primarily composed of metallic Pt.…”

Section: Co Stripping Voltammetrymentioning

confidence: 91%

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H<sub>2</sub> Oxidation Activity and Tolerance to CO Poisoning of the Electrochemically Reduced Pt Oxide Catalyst

2015

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In order to develop a novel anode catalyst for a PEFC, the Pt thin film and the Pt oxide thin film were produced by reactive sputtering, and the catalytic activity of the H 2 oxidation in the presence of CO or the tolerance to the CO poisoning was evaluated by the anodic polarization in an H 2 -saturated H 2 SO 4 solution or a (H 2 + CO)-saturated one. The H 2 oxidation activity of the Pt thin film remarkably deteriorated due to the CO poisoning. On the other hand, the electrochemical reduction produced a tolerance to the CO poisoning during the H 2 oxidation of the Pt oxide thin film. For the Pt oxide thin film electrochemically reduced at ¹0.3 C, the H 2 oxidation current in a (H 2 + 100 ppm CO)-saturated solution remained at the same level as in the H 2 -saturated one. The CO stripping voltammetry also revealed that the CO coverage was only 0.15 for the electrochemically reduced Pt oxide thin film although the CO coverage on the Pt thin film was calculated to be 0.95. Therefore, the electrochemically reduced Pt oxide may be a promising anode catalyst of the PEFC having a tolerance to CO poisoning. Moreover, the XPS analysis showed that there was a distinct difference in the chemical bonding state between the Pt thin film and the electrochemically reduced Pt oxide thin film. That is, a large spectrum due to the Pt-O bond was detected for the electrochemically reduced Pt oxide thin film, while the spectrum scarcely appeared for the Pt thin film. These results suggested that the residual oxygen might improve the tolerance to the CO poisoning during the H 2 oxidation of the electrochemically reduced Pt oxide thin film.

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Section: Co Stripping Voltammetrymentioning

confidence: 91%

“…9,10) The Ti rod coated with the Pt thin film or the Pt oxide thin film was attached to a brass holder and covered with an acrylic cap forming a disk electrode having a reaction area of 19.6 mm 2 . The disk electrode was then placed on a rotating electrode system (Hokuto Denko, HR-202) as the working electrode.…”

Section: 2mentioning

confidence: 99%

H<sub>2</sub> Oxidation Activity and Tolerance to CO Poisoning of the Electrochemically Reduced Pt Oxide Catalyst

2015

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“…The spectrum peaks of the Pt oxide films prepared by reactive sputtering in our previous study were 74.6 eV for PtO 2 and 72.1 eV for PtO. 9) On the other hand, the binding energy of the Pt4f 7/2 level of metallic Pt substantially agreed with 70.9 eV. 16) Based on the information of the binding energy, (a) the Pt oxide thin film without reduction was composed of PtO 2 and PtO as shown in Fig.…”

Section: 12)mentioning

confidence: 99%

Methanol Oxidation Activity and Chemical State of Platinum Oxide Thin Film Treated by Electrochemical Reduction

2013

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The methanol oxidation activity of Pt oxide can be significantly improved by heat reduction in a H 2 atmosphere or by electrochemical reduction using a cathodic current. Therefore, the Pt oxide is expected to be a novel anode catalyst for DMFC. In this study, measurement of the electrochemical active surface area by CO stripping voltammetry, analysis of the chemical bonding state by XPS and determination of the O/Pt atomic ratio by EPMA were carried out to investigate the cause of the improvement in the methanol oxidation activity of the Pt oxide by the reduction treatment. Although the methanol oxidation current remarkably increased by electrochemical reduction treatment of the Pt oxide thin film prepared by reactive sputtering in 100% O 2 , the effect of the reduction on the methanol oxidation activity was not recognized at all for the Pt thin film prepared in 100% Ar. For the Pt oxide thin films, it was shown that there was a close correlation between the methanol oxidation current and the electrochemically active surface area obtained by CO stripping voltammetry. Moreover, the quantitative analysis by EPMA clearly showed that the O/Pt atomic ratio of the Pt oxide thin film having a high activity for the methanol oxidation reaction decreased to about 0.1 by the electrochemical reduction. These results together with the XPS analysis suggested that the residual oxygen related to the PtO bond was activating the methanol oxidation for the electrochemically reduced Pt oxide thin films.

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Electrochemically reduced Pt oxide thin film as a highly active electrocatalyst for direct ethanol alkaline fuel cell

Takahashi

Sagihara

Taguchi

2014

International Journal of Hydrogen Energy

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Methanol Oxidation Activities of Pt Oxide Thin Films Prepared by Reactive Sputtering

Cited by 7 publications

References 6 publications

H<sub>2</sub> Oxidation Activity and Tolerance to CO Poisoning of the Electrochemically Reduced Pt Oxide Catalyst

H<sub>2</sub> Oxidation Activity and Tolerance to CO Poisoning of the Electrochemically Reduced Pt Oxide Catalyst

Methanol Oxidation Activity and Chemical State of Platinum Oxide Thin Film Treated by Electrochemical Reduction

Electrochemically reduced Pt oxide thin film as a highly active electrocatalyst for direct ethanol alkaline fuel cell

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