Magnetic control of mass transfer and convection in electrochemical processes
- the Lorentz force can utilize the existing Faraday current.
- the magnetic gradient force acts on a para- or diamagnetic electrolyte.
- the control by magnetic fields is contactless.
Fields of research
- detailed understanding of the interplay of magnetic forcing, convection and mass transfer
- increasing the limiting current (space-time yield) in copper electrolysis
- improving the uniformity of deposits, thus saving energy and material
- structured deposition of para- and diamagnetic ions by utilizing the magnetic gradient force
- gas evolution under the influence of magnetic fields for improving the process efficiency and/or the quality of deposits
- lab-scale experiments; visualization of electrolyte convection and species concentration
- numerical modelling and simulation
- D. Baczyzmalski, F. Karnbach, X. Yang, G. Mutschke, M. Uhlemann, K. Eckert, C. Cierpka, On the electrolyte convection around a hydrogen bubble evolving at a microelectrode under the influence of a magnetic field, J. Electrochem. Soc. 163 (2016) 9, E248-E257.
- D. Baczyzmalski, T. Weier, C. Cierpka, C.J. Kähler, Near-wall measurements of the bubble- and Lorentz-force-driven convection at gas-evolving electrodes, Exp. Fluids 56 (2015), 162.
- G. Mutschke, K. Tschulik, M. Uhlemann, J. Fröhlich, Numerical simulation of the mass transfer of magnetic species at electrodes exposed to small-scale gradients of the magnetic field, Magnetohydrodynamics 51(2015)2, 369-374.
- S. Mühlenhoff, G. Mutschke, M. Uhlemann, X. Yang, S. Odenbach, J. Fröhlich, K. Eckert, On the homogenization of the thickness of Cu deposits by means of MHD convection within small dimension cells, Electrochem. Comm. 36 (2013) 80-83.
- T. Weier, S. Landgraf, The two-phase flow at gas-evolving electrodes: bubble-driven and Lorentz-force-driven convection, Eur. Phys. J. Spec. Top. 220 (2013), 313-322.
- G. Mutschke, K. Tschulik, M. Uhlemann, A. Bund, J. Fröhlich, Comment on “Magnetic structuring of electrodeposits”, Phys. Rev. Lett. 109 (2012) 229401.
- G. Mutschke, K. Tschulik, T. Weier, M. Uhlemann, A. Bund, J. Fröhlich, On the action of magnetic gradient forces in micro-structured copper deposition. Electrochim. Acta 55 (2010) 9060-9066.
- G. Mutschke, A. Hess, A. Bund, J. Fröhlich, On the origin of horizontal counter-rotating electrolyte flow during copper magnetoelectrolysis. Electrochim. Acta 55 (2010) 1543-1547.
- T. Weier, K. Eckert, S. Mühlenhoff, C. Cierpka, A. Bund, M. Uhlemann, Confinement of paramagnetic ions under magnetic field
influence: Lorentz versus concentration gradient force based explanations, Electrochem. Comm. 9 (2007) 2479–2483.