Direct measurement of electrochemical reaction kinetics in flow-through porous electrodes |
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| Institution: | 1. School of Mechatronic Systems Engineering, Simon Fraser University, 250-13450 102 Avenue, Surrey, BC V3T 0A3, Canada;2. Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada;1. Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;2. Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland;1. University of Chemistry and Technology, Prague, Technická 5, 166 28 Praha 6, Czech Republic;2. New Technologies – Research Centre, University of West Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic;3. University of Applied Sciences Landshut, Technology Centre for Energy, Wiesenweg 1, 94099 Ruhstorf a. d. Rott, Landshut, Germany |
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| Abstract: | This work demonstrates the feasibility of measuring electrochemical reaction rates on common flow-through porous electrodes by traditional Tafel analysis. A customized microfluidic channel electrode was designed and demonstrated by measuring the intrinsic kinetics of the V2 +/V3 + and VO2 +/VO2+ redox reactions in carbon paper electrodes under forced electrolyte flow. The exchange current density of the V2 +/V3 + reaction was found to be nearly two orders of magnitude slower than the VO2 +/VO2+ reaction, indicating that this may be the limiting reaction in vanadium redox flow batteries. The forced convection in this technique is found to generate reproducible exchange current densities which are consistently higher than for conventional electrochemical methods due to improved mass transport. |
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