Diagnosis of the Mechanism of Anodic Oxide Film Growth on Platinum in KOH
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Abstract
Diagnostic criteria for growth of the anodic oxide film on platinum in KOH are reported. In this work, the analytical analysis of oxide film growth demonstrated that the electric field in the passive film formed anodically on platinum in KOH is constant, independent of the applied voltage and barrier layer thickness. This criterion intrinsically distinguishes the Point Defect Model (PDM) from the High Field Model (HFM). Unequivocally, the PDM provides a superior theoretical framework than does the HFM for interpreting oxide film growth on platinum. Importantly, we argue that the diagnostic criteria also apply to metal interstitial conduction, which is the mechanism proposed in the HFM for formation of the PtO oxide film on platinum, but with film growth occurring at the film/solution interface and with a thickness-dependent electric field, rather than being restricted to oxygen vacancy conductors alone, as originally derived for the PDM. Thus, the ability of the diagnostic criteria to differentiate between the HFM and the PDM, in this case, is a direct assessment of the dependence of the electric field strength on the applied voltage and barrier layer thickness, with the experimental results coming down unequivocally on the side of the PDM.
Acknowledgement
Feixiong Mao gratefully thanks China Scholarship Council for supporting his stay at the University of California at Berkeley.
©2015 Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Frontmatter
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- Experimental and Theoretical Investigations of Adsorption and Inhibitive Properties of Tween 80 on Corrosion of Aluminum Alloy (A5754) in Alkaline Media
- Diagnosis of the Mechanism of Anodic Oxide Film Growth on Platinum in KOH
- Evaluation of Antibacterial Activities of 4-Hydroxycoumarin Derivatives
- Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization of Styrene in the Presence of Hydrophobically Modified Silica Aerogel Nanoparticles
- Corrigendum
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Articles in the same Issue
- Frontmatter
- A Comparative Study of Two Bicyclic Ethers, Eucalyptol and 1,4-Cineole, by Broadband Rotational Spectroscopy
- New Insights from an Empirical Multi-Property Interatomic Potential and Predicted Collision-induced Light Scattering Spectra for Hg-rare Gas van der Waals Complexes
- Influence of Ni–Cu–P Deposits on the Surface Characteristics of Anodized Al, Al2014 and Al7075
- A Mechanistic Studies of Mn(II) Catalyzed Oxidation of a Gabapentin by Peroxomonosulphate in Aqueous Alkaline Medium
- Experimental and Theoretical Investigations of Adsorption and Inhibitive Properties of Tween 80 on Corrosion of Aluminum Alloy (A5754) in Alkaline Media
- Diagnosis of the Mechanism of Anodic Oxide Film Growth on Platinum in KOH
- Evaluation of Antibacterial Activities of 4-Hydroxycoumarin Derivatives
- Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization of Styrene in the Presence of Hydrophobically Modified Silica Aerogel Nanoparticles
- Corrigendum
- Corrigendum to: Plasmon-Driven Dissociation of H2 on Gold Nanoclusters
