TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Jahnke, Thomas
A1  - Zago, Matteo
A1  - Casalegno, Andrea
A1  - Bessler, Wolfgang G.
A1  - Latz, Arnulf
T1  - A transient multi-scale model for direct-methanol fuel cells
JF  - Electrochimica Acta
N2  - The DMFC is a promising option for backup power systems and for the power supply of portable devices. However, from the modeling point of view liquid-feed DMFC are challenging systems due to the complex electrochemistry, the inherent two-phase transport and the effect of methanol crossover. In this paper we present a physical 1D cell model to describe the relevant processes for DMFC performance ranging from electrochemistry on the surface of the catalyst up to transport on the cell level. A two-phase flow model is implemented describing the transport in gas diffusion layer and catalyst layer at the anode side. Electrochemistry is described by elementary steps for the reactions occurring at anode and cathode, including adsorbed intermediate species on the platinum and ruthenium surfaces. Furthermore, a detailed membrane model including methanol crossover is employed. The model is validated using polarization curves, methanol crossover measurements and impedance spectra. It permits to analyze both steady-state and transient behavior with a high level of predictive capabilities. Steady-state simulations are used to investigate the open circuit voltage as well as the overpotentials of anode, cathode and electrolyte. Finally, the transient behavior after current interruption is studied in detail.
Y1  - 2017
SN  - 0013-4686
SS  - 0013-4686
U6  - https://doi.org/10.1016/j.electacta.2017.02.116
DO  - https://doi.org/10.1016/j.electacta.2017.02.116
SP  - 215
EP  - 225
S1  - 11
PB  - 232
ER  -