Electrochemical activities in the Rossendorf MHD group


Electrochemical activities in the Rossendorf MHD group

Hüller, J.; Weier, T.; Gerbeth, G.

Momentum and mass transfer during electrochemical reactions in a small cell can be significantly influenced by Lorentz forces. Depending on the magnetic field configurations, a multitude of flow fields with an accordingly large range of mass transfer conditions can be arranged. The moderate magnetic field of simple permanent magnets placed behind the electrodes, although its action is limited to the vicinity of the electrodes, is able to promote convection in the whole cell. The interplay of Lorentz and buoyancy forces is substantial for the resulting flow structure.

Our activities were directed to the investigation of some diffusion controled electrochemical reactions like [Fe(CN)6]3+/[Fe(CN)6]4+, Ce4+/Ce3+ and the electrodeposition of Cu2+.

Since Faradaic currents are inherently coupled to electrochemical processes, the mass transfer enhancement attainable by Lorentz force induced convection does not increase the running costs. Therefore it seems attractive to perform further studies in order to determine the underlying scaling laws.

In a second part of the discussion a fluidic microsystem is presented. The silicon-glass wafer system is produced in a micromechanic planar technology and consists of a network of microfluidic channels. The microsystem can be coupled with microsensors and actuators.

  • Lecture (Conference)
    COST F2 Symposium "Electrochemical Flow Measurements and Microfluidics", 01.-03.07.2004, Poitiers, France

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Publ.-Id: 6310