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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2018: 0.975
5-year IMPACT FACTOR: 1.021

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.327
Source Normalized Impact per Paper (SNIP) 2018: 0.391

Online
ISSN
2196-7156
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Volume 227, Issue 5

Issues

Growth Kinetics of the Anodic Oxide Film on Platinum under Potentiodynamic Polarization Conditions

JianEr Bao / Digby D. Macdonald
Published Online: 2013-03-11 | DOI: https://doi.org/10.1524/zpch.2013.0314

Abstract

A theory for the anodic oxidation of a metal under linear potentiodynamic conditions is derived based upon the Point Defect Model (PDM), by considering two contributions to the current; that from the metal oxidation reaction and that from capacitive charging. The veracity of the theory is demonstrated by analyzing linear potentiodynamic polarization curves for platinum in the oxide formation potential region. By optimizing the derived potential sweep rate-dependent current density expression on the measured ivs.V polarization data for the electrochemical oxidation of platinum in 0.1 M KOH solution at ambient temperature (22 ± 2 ºC) as a function of potential sweep rate, kinetic parameters for the growth and dissolution of the anodic film on platinum are extracted. The growth and dissolution rates of the oxide film are of the order of × 1012 m/s (0.001 nm/s). The structure and electronic properties of the anodic film on platinum are also discussed. The film is n-type in electronic character, and is postulated to be a nano-crystalline structure probably comprising columnar, tetragonal unit cells or half cells (monolayer of oxygen) oriented with the c-axis perpendicular to the metal surface for an optimal epitaxial relationship with the substrate metal. For the very thinnest films (<0.1 nm thick), the film is postulated to comprise “buried” oxygen atoms or ions in the platinum surface.

Keywords: Platinum; Potentiodynamic Polarization; Passivity; Passive Film Growth

About the article

* Correspondence address: Pennsylvania State University, Department of Materials Science and Engineering, University Park, Center of Electrochemical Science and Technology, 16802 PA, U.S.A.,


Published Online: 2013-03-11

Published in Print: 2013-05-01


Citation Information: Zeitschrift für Physikalische Chemie, Volume 227, Issue 5, Pages 541–559, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2013.0314.

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[1]
Feixiong Mao, Samin Sharifi-Asl, Jingkun Yu, and Digby D. Macdonald
Journal of The Electrochemical Society, 2014, Volume 161, Number 5, Page C254

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