An SOFC anode model using TPB-based kinetics
| Autor: | J. N. Stam, Pradeep Chundru, H.C. Patel, A.N. Tabish, P.V. Aravind |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Kinetics Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Cermet Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Anode Fuel Technology chemistry Chemical engineering Electrode 0210 nano-technology Order of magnitude |
| Zdroj: | International Journal of Hydrogen Energy. 45:27563-27574 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.07.037 |
| Popis: | Fundamental studies focusing on the electrode kinetics are essential in understanding the fuel cell operation and optimizing the electrode designs. In this study, we determined the triple-phase boundary (TPB)-based kinetics of hydrogen electrochemical oxidation using nickel patterned electrode experimental data and the Butler-Volmer formalism of the oxidation process. The same kinetics are then incorporated in a cermet electrode electrochemical model to estimate the effective TPB density of the nickel/yittrium-stabilized zirconia cermet anode. The kinetics are found to be of the same order of magnitude as previously determined by the microstructure reconstruction of cermet anode. Simulation results further revealed that the effective TPB density is several orders of magnitude lower than the typically reported physical densities of the cermet anode that possibly suggests that only a minor fraction of the physical TPB is actually required or available to produce the cell current at given cell voltage. The effect of various operating conditions on the anode activation overpotential is also investigated and discussed in this study. |
| Databáze: | OpenAIRE |
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