SOFC Modeling and Parameter Identification by means of Impedance Spectroscopy

Abstract

not Available.

Three-dimensional printed yttria-stabilized zirconia self-supported electrolytes for solid oxide fuel cell applications

“…The optimum attachment temperature of both electrodes was determined, with especial attention to the one of the cathode side, after systematical evaluation of the polarization resistance in symmetrical cell configuration (not presented here for conciseness reasons). Area specific resistances of ASR=0.4 Ωcm 2 and ASR=0.2 Ωcm at 900ºC and activation energies of Ea=1.12±0.04 eV and Ea=1.43±0.02 eV were 2 obtained for the optimized anode and cathode layers, respectively, being in reasonable agreement with the literature [43] [44]. A detail of the attachment of a typical cathode to the electrolyte layer is presented in Figure 2c showing the good connnectivity required to ensure a high performance in SOFC mode.…”

Ultrathin Atomic Layer-Deposited CeO2 Overlayer for High-Performance Fuel Cell Electrodes

“…Furthermore, the semicircles in the lowfrequency range (<5 kHz) whose sizes change depending on the cell voltage represent the activation resistances. 21,22 The ohmic resistances are 77 ± 8 and 66 ± 2 Ω cm 2 for the 0-and 5-cycle samples, respectively. The relatively high ohmic resistance of the 0-cycle sample seems to be due to the reduced active cross-sectional area even at the initial stage of measurement as was also reported in the previous literature by Jung et al 23 The activation resistances are 47 ± 5 and 31 ± 3 Ω cm 2 for the 0-and 5-cycle samples at 0 h, respectively.…”

Novel porous electrode designs for reversible solid oxide hydrogen planar cell through multi‐physics modeling

“…Butler‐Volmer type equations are used to describe the oxidation and reduction reactions and their voltage‐current density relationships [13, 14]: $$$$\begin{eqnarray} {{ \def\eqcellsep{&}\begin{array}{l} {i}_{H,\textit{loc}}={i}_{0,H}\left[\exp \left(\displaystyle\frac{{\alpha}_{H}F{\eta}_{\textit{act},H}}{\textit{RT}}\right)-\exp \left(-\displaystyle\frac{(1-{\alpha}_{H}){n}_{e}F{\eta}_{\textit{act},H}}{\textit{RT}}\right)\right] \end{array} }}\nonumber\hspace*{-10pt}\\ \end{eqnarray}$$$$ $$$$\begin{eqnarray} {{ \def\eqcellsep{&}\begin{array}{l} {i}_{O,\textit{loc}}={i}_{0,O}\left[\exp \left(\displaystyle\frac{{\alpha}_{O}F{\eta}_{\textit{act},O}}{\textit{RT}}\right)-\exp \left(-\displaystyle\frac{(1-{\alpha}_{O}){n}_{e}F{\eta}_{\textit{act},O}}{\textit{RT}}\right)\right] \end{array} }}\nonumber\hspace*{-10pt}\\ \end{eqnarray}$$$$where $${i}_{H,\textit{loc}}$$ and $${i}_{O,\textit{loc}}$$ represent local current density in hydrogen electrode and oxygen electrode respectively, α H and α O represent the charge transfer coefficients ...…”

“…[13] and Leonide et al. [14]): $$$$\begin{equation} {i}_{0,H}={\gamma}_{H}{\left({p}_{{H}_{2}}^{\textit{TPB}}\right)}^{a}{\left({p}_{{H}_{2}O}^{\textit{TPB}}\right)}^{b}\exp \left(-\frac{{\mathrm{E}}_{\textit{act},H}}{\mathrm{RT}}\right) \end{equation}$$$$ $$$$\begin{equation} {i}_{0,O}={\gamma}_{O}{\left({p}_{{O}_{2}}^{\textit{TPB}}\right)}^{m}\exp \left(-\frac{{\mathrm{E}}_{\textit{act},O}}{\mathrm{RT}}\right) \end{equation}$$$$where $${p^{TPB}}$$ stands for the partial pressure at the TPB. $${\mathrm{E}}_{\textit{act},H}$$ and $${\mathrm{E}}_{\textit{act},O}$$ are the activation energies for the respective oxidation/reduction reactions, along with the prefactors $${\gamma _H}$$ and $${\gamma _O}$$.…”