Electrochemical reduction of oxygen on thin-film Pt electrodes in acid solutions

Sarapuu, Ave; Kasikov, Aarne; Laaksonen, Timo; Kontturi, Kyösti; Tammeveski, Kaido

doi:10.1016/j.electacta.2008.04.003

Cited by 80 publications

(51 citation statements)

References 45 publications

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“…8b, and the Tafel plots based on area-specific activity and mass activity after mass-transfer correction by the Koutecky-Levich equation are shown in Fig. 8c and d, respectively [38]. It can be found in Fig.…”

Section: Electrocatalytic Performancesmentioning

confidence: 97%

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Zhang

Shao

et al. 2013

Electrochimica Acta

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Section: Electrocatalytic Performancesmentioning

confidence: 97%

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Zhang

Shao

et al. 2013

Electrochimica Acta

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“…10,36 The number of electrons transferred per O 2 molecule for Pt on GC, Pt on NbO, and Pt on NbO 2 were similarly calculated to be 4. However, as Sarapuu et al 37 indicated, it is not possible to unequivocally establish whether the reduction of O 2 proceeds through the direct 4e -pathway or through a H 2 O 2 intermediate pathway.…”

mentioning

confidence: 99%

Oxygen Reduction Reaction Activity and Electrochemical Stability of Thin-Film Bilayer Systems of Platinum on Niobium Oxide

et al. 2010

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=af7f4c9a-daa7-4ca4-bf5e-4795e8f31e04 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=af7f4c9a-daa7-4ca4-bf5e-4795e8f31e04 Burnaby, British Columbia, V5A 1S6, Canada, and NRC Institute for Fuel Cell InnoVation, 4250 Wesbrook Mall, VancouVer, British Columbia, V6T 1W5, Canada ReceiVed: May 11, 2010; ReVised Manuscript ReceiVed: July 26, 2010 We used electrochemical testing and theoretical calculations based on density functional theory (DFT) to examine the oxygen reduction reaction (ORR) activity of platinum electrocatalyst supported on several forms of niobium oxide. Bilayer electrocatalysts were synthesized in the form of 5 nm thick Pt layers (ca. 0.01 mg/cm 2 ), deposited on 5 or 10 nm thick niobium oxide and backed by glassy carbon (GC) electrodes. The NbO and NbO 2 supports enhance the specific electrochemical activity of Pt relative to the identically synthesized baseline system of Pt on GC but have no positive effect on the mass activity. The electrochemical stability of the Pt/NbO 2 bilayer system was investigated by potential cycling with up to 2500 cyclic voltammetry (CV) cycles. After 2500 cycles, data indicates minimal electrochemical area loss. With the use of DFT calculations, we have evaluated effects of oxygen incorporation on stability, electronic structure, and electrochemical activity of Pt|Nb x O y systems. Calculations predict a transfer of electronic charge density from Nb, NbO, and NbO 2 to Pt and a reverse case for Nb 2 O 5 . However, the experimental ORR activity does not follow the trends predicted by the d-band model.

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“…An idea about the morphology of the electron-beam deposited Pt overcoats with a nominal thickness of 0.2 nm has been previously obtained from transmission electron microscopy (TEM) measurements [20]. For the measurements, Pt was deposited on a Formvar underlayer at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Pt coated Cr2O3 thin films for resistive gas sensors

Kasikov¹,

Gerst²,

Kikas

et al. 2009

Open Physics

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Abstract:The resistive response of atomic layer deposited thin epitaxial α-Cr 2 O 3 (0 0 1) films, to H 2 and CO in air, was studied. The films were covered with Pt nanoislands formed by electron-beam evaporation of a submonolayer amount of the material. The gas measurements were performed at 250°C and 450°C. These temperatures led to different proportion of chemical states, Pt 2+ and Pt 4+ , to which the Pt oxidized. The modification was ascertained by the X-ray photoelectron spectroscopy method. As a result of the modification, the response was fast at 250°C, but slowed at 450°C. A disadvantageous abundance of Pt 4+ arising at 450°C in air could be diminished by high-vacuum annealing thus restoring the response properties of the system at 250°C. PACS

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Electrochemical reduction of oxygen on thin-film Pt electrodes in acid solutions

Cited by 80 publications

References 45 publications

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Oxygen Reduction Reaction Activity and Electrochemical Stability of Thin-Film Bilayer Systems of Platinum on Niobium Oxide

Pt coated Cr2O3 thin films for resistive gas sensors

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