Theory of cyclic voltammetry in random arrays of cylindrical microelectrodes applied to carbon felt electrodes for vanadium redox flow batteries

• DOI: 10.1039/c9cp00548j
• Publication Date: 2019-03-04T14:36:25Z
• Authors: Tim Tichter; Dirk Andrae; Jacob Mayer; Jonathan Schneider; Marcus Gebhard; Christina Roth
• Keywords: Carbon fibers

In order to quantitatively investigate the kinetic performance and pore size distribution of carbon felt electrodes for application in vanadium redox flow batteries, theory cyclic voltammetry (CV) is derived a random network cylindrical microelectrodes on base convolutive modeling. this context we present an algorithm based use modified Talbot contour inverse Laplace transformation, providing mass transfer functions required calculation CV responses external finite diffusion space. First-order homogenous chemical kinetics preceding and/or following electrochemical reactions are implemented as well. The VO2+ oxidation investigated model reaction at pristine electrochemically aged commercial electrodes. A fit simulated data experimental clearly shows that aging predominantly affects electron internal electrode surfaces distributions remain constant. estimated excellent agreement with porosimetry measurements, validating our new strategy determine porosities simultaneously via CV.