Fast-scan cyclic voltammetry and scanning electrochemical microscopy studies of the pH-dependent dissolution of 2-electron mediators immobilized on zirconium phosphate containing carbon pastes

Research output: Contribution to journalArticle


A detailed study is presented on the leaking of two different 2-electron-transfer redox mediators from zirconium phosphate-modified carbon-paste electrodes. Two redox mediators commonly used in bioelectrochemistry, viz. methylene green and riboflavin, were adsorbed on zirconium phosphate and further integrated into carbon paste. Fast scan cyclic voltammetry and scanning electrochemical microscopy were used to characterize the leakage of these redox mediators at different pH conditions. It could be shown that an exposure to acidic pH-values significantly increased the rate of their leakage from the mediator-zirconium phosphate-modified carbon paste, whereas a tight adsorption was observed at neutral pH.


  • Florentina Munteanu
  • M Mosbach
  • A Schulte
  • W Schuhmann
  • Lo Gorton
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Analytical Chemistry


  • carbon-paste electrodes, modified, zirconium phosphate, leakage, methylene green, riboflavin, fast-scan cyclic voltammetry, scanning, electrochemical microscopy (SECM)
Original languageEnglish
Pages (from-to)1479-1487
Issue number21
Publication statusPublished - 2002
Publication categoryResearch

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Analytical Chemistry (S/LTH) (011001004)