TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Neidhardt, Jonathan Philipp A1 - Kee, Robert J. A1 - Bessler, Wolfgang G. T1 - Electrode Reoxidation in Solid-Oxide Cells: Detailed Modeling of Nickel Oxide Film Growth JF - ECS Transactions N2 - The lifetime and performance of solid-oxide fuel cells (SOFC) and electrolyzer cells (SOEC) can be significantly degraded by oxidation of nickel within the electrode and support structures. This paper documents a detailed computational model describing nickel oxide (NiO) formation as a growing film layer on top of the nickel phase in Ni/YSZ composite electrodes. The model assumes that the oxidation rate is controlled by transport of ions across the film (Wagner's theory). The computational model, which is implemented in a two-dimensional continuum framework, facilitates the investigation of alternative chemical reaction and transport mechanisms. Model predictions agree well with a literature experimental measurement of oxidation-layer growth. In addition to providing insight in interpreting experimental observations, the model provides a quantitative predictive capability for improving electrode design and controlling operating conditions. KW - Nickel KW - Oxidation KW - Hochtemperaturbrennstoffzelle Y1 - 2013 UR - https://elib.dlr.de/84934/1/Neidhardt_ECStrans_2013.pdf SN - 1938-5862 SS - 1938-5862 U6 - https://doi.org/10.1149/05701.2573ecst DO - https://doi.org/10.1149/05701.2573ecst VL - 57 IS - 1 SP - 2573 EP - 2582 ER -