Implications of resistance and mass transport limitations on the common Tafel approach at composite catalyst thin-film electrodes

Blanc, N. and Rurainsky, C. and Tschulik, K.

Volume: 872 Pages:
DOI: 10.1016/j.jelechem.2020.114345
Published: 2020

The use of rotating disk electrodes modified with multicomponent catalyst inks is common practice in electrocatalysis. In this work, we present a numerical model to simulate the effect of altered mass transport and conductivity inside a catalyst film, consisting of catalytically active nanoparticles and an inert binder material. Implications for the classical Tafel analysis are evaluated at different combinations of film resistances and mass transport properties. We show that in some cases, linear Tafel-like voltammetric responses may result, which do not contain actual kinetic information and might therefore be misleading and cause of erroneous catalyst activity evaluation. © 2020 Elsevier B.V.

« back