ITHES   25084
INSTITUTO DE TECNOLOGIAS DEL HIDROGENO Y ENERGIAS SOSTENIBLES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Multiscale coupling of PEM Fuel Cell models under self-sustained oscillations in the anodic potential induced by CO poisoning
Autor/es:
FALAGÜERRA TOMÁS; CORREA PERELMUTER GABRIEL; LEVITÁN DAVID; GIUNTA PABLO
Lugar:
Rio de Janeiro
Reunión:
Congreso; 22TH WORLD HYDROGEN ENERGY CONGRESS; 2018
Institución organizadora:
INTERNATIONAL ASSOCIATION OF HYDROGEN ENERGY
Resumen:
The main objective of this work is to analyze through a multi-dimensional model the temperature and hydrogen distribution within the fuel cell in the presence of CO impurities in the H2 inlet, and its effect on overall performance.A 2D and 1D transport models of a single cell was simulated into seven domains: membrane, flow channels for hydrogen and oxygen, each platinum catalyst layer (CL), and the Gas Diffusion Layer (GDL) by COMSOL Multiphysics. This model was coupled with a 1-D in-house electrochemical double layer model. Species concentration distribution, transport phenomena and the current density were calculated simultaneously and later coupled with thermal model solved over all the computational domains. The inputs of the model are the initial cathode concentrations (N2, O2, H2O), the anode inlet mass fractions (H2, H2O, CO), cathode and anode inlet flows and pressures, the initial temperature of the system and the electric potential difference between both electrodes.The in-house anode model is built upon electrostatic, chemical kinetic and thermodynamic principles underlying the operation of a fuel cell, giving all introduced variables a physical meaning, and also featuring a novel probabilistic treatment of dipole interactions in the compact layer. Two regions of the electrochemical double layer are modelled: in the ?diffuse layer? farther away from the electrode an explicit system of differential equations is derived for the electrostatic potential and protonic concentration, while in the ?compact layer? of adsorbed molecules several modifications have been made from previous models to account for the presence of different species of dipole molecules on the electrode surface.Since the aim of this work was to study the behavior of the fuel cell under the effect of CO at the anode side, we apply the model only to this electrode. The electrochemistry of the cathode side is captured with by Butler-Volmer kinetic expressions with no further level of detail. The coupling of scales allows for the study of the interplay between the kinetics of CO-poisoned H2 oxidation, the transport of chemical species, and the effect of local temperature variations on the system.