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Journal of Applied Electrochemistry

, Volume 40, Issue 3, pp 581–592 | Cite as

New oxygen evolution anodes for metal electrowinning: investigation of local physicochemical processes on composite electrodes with conductive atomic force microscopy and scanning electrochemical microscopy

  • Sönke Schmachtel
  • Sascha E. Pust
  • Kyösti Kontturi
  • Olof Forsén
  • Gunther Wittstock
Original Paper

Abstract

Atomic force microscopy (AFM), conductive atomic force microscopy (CAFM) in air, and scanning electrochemcial microscopy (SECM) in 2 M H2SO4 have been used to investigate model composite electrodes obtained by pressing sieved MnO2 particles into a Pb matrix. These model electrodes shall resemble new composite electrodes produced by coldspraying and currently being tested for Zn electrowinning. CAFM showed a very uneven distribution of the current path through the matrix electrode with the highest currents measured at the MnO2/Pb domain boundary. SECM images in the substrate-generation/tip-collection mode in vertical and horizontal planes could show spatial concentration distribution of H+, O2 and H2O2 that could be evaluated qualitatively despite interfering turbulent convection due to raising gas bubbles. There is a concentration overvoltage due to deviations of the H+ and O2 concentration close to the surface from the bulk value. It amounts to about 40–50 mV for both compounds. H2O2 is formed as an intermediate and is consumed at the MnO2 catalyst particles.

Keywords

Composite electrodes Electrowinning Lead electrode Manganese dioxide Electrocatalysis Oxygen evolution Atomic force microscopy Conductive atomic force microscopy Scanning electrochemical microscopy 

Notes

Acknowledgments

The work has been partially supported by Deutsche Forschungsgemeinschaft (DFG, grant Wi 1617/8). Sönke Schmachtel wishes to acknowledge financial support by Outokumpu foundation and ESPOM graduate school, and Outotec for covering material costs.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Laboratory of Physical Chemistry and ElectrochemistryHelsinki University of Technology (TKK)EspooFinland
  2. 2.Laboratory of Materials Chemistry and CorrosionHelsinki University of Technology (TKK)EspooFinland
  3. 3.Department of Pure and Applied ChemistryCarl von Ossietzky University of Oldenburg, Faculty of Mathematics and Science, Center of Interface Science (CIS)OldenburgGermany
  4. 4.IEF5 – PhotovoltaikForschungszentrum Jülich GmbHJülichGermany

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