Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

Energies

Anna Enrico¹  Marco Cannarozzo¹ 

[1] Department of Civil, Chemical and Environmental Engineering (DICCA), Polytechnic School, University of Genoa, Via Opera Pia 15, 16145 Genoa, Italy;

关键词: intermediate temperature-solid oxide fuel cell (IT-SOFC);    Ni-(ZrO₂)_x;    anode;    anode-supported cell;    bi-layer electrode;    modeling;   

DOI  :  10.3390/en7095647

来源: mdpi

【 摘 要 】

Intermediate temperature-solid oxide fuel cell (IT-SOFC) Ni-(ZrO₂)_x(Y₂O₃)_1−x (Ni-YSZ) anodes formed by two layers, with different thicknesses and morphologies, offer the possibility of obtaining adequate electrochemical performance coupled to satisfactory mechanical properties. We investigate bi-layered Ni-YSZ anodes from a modeling point of view. The model includes reaction kinetics (Butler-Volmer equation), mass transport (Dusty-Gas model), and charge transport (Ohm’s law), and allows to gain an insight into the distribution of the electrochemical reaction within the electrode. Additionally, the model allows to evaluate a reciprocal overall electrode resistance 1/R_p ≈ 6 S·cm⁻² for a bi-layer electrode formed by a 10 μm thick active layer (AL) composed of 0.25 μm radius Ni and YSZ particles (34% vol. Ni), coupled to a 700 μm thick support layer (SL) formed by 0.5 μm radius Ni and YSZ particles (50% vol. Ni), and operated at a temperature of 1023 K. Simulation results compare satisfactorily to literature experimental data. The model allows to investigate, in detail, the effect of morphological and geometric parameters on the various sources of losses, which is the first step for an optimized electrode design.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.