A study of the electrochemical reactivity of titanium under cathodic polarization by means of combined feedback and redox competition modes of scanning electrochemical microscopy

Abdelilah Asserghine, Martina Medvidović-Kosanović, Livia Nagy, Ricardo M. Souto, Geza Nagy

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effect of cathodic polarization on the electrochemical behavior of the thin titanium dioxide film formed by anodic pretreatment over pure commercial titanium metal for biomaterial application was investigated in situ using scanning electrochemical microscopy (SECM). Quantitative information on the electron transfer rates (keff) at the titanium surface was obtained using the feedback operation of SECM with ferrocene-methanol (FcMeOH) as electrochemical mediator. An increase of keff values with the increase of the negative polarization was detected, a feature that correlates well with the decrease of titanium oxide resistance with increasing cathodic polarization observed using electrochemical impedance spectroscopy (EIS). In addition, SECM operation in the redox competition mode proved that hydrogen was absorbed in the surface oxide film leading to changes in conductivity and electrochemical reactivity.

Original languageEnglish
Article number128339
JournalSensors and Actuators, B: Chemical
Volume320
DOIs
Publication statusPublished - Oct 1 2020

Keywords

  • Cathodic polarization
  • Corrosion resistance
  • Electron transfer reaction
  • SECM
  • Thin titanium dioxide layers
  • Titanium biomaterial

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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