Moisture-dependent electrochemical characterization of Ba0.2Sr1.8Fe1.5Mo0.5O6-δ as the fuel electrode for solid oxide electrolysis cells (SOECs)
| Autor: | Kittiwat Kamlungsua, Pei-Chen Su |
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| Přispěvatelé: | School of Mechanical and Aerospace Engineering, Interdisciplinary Graduate School (IGS), Energy Research Institute @ NTU (ERI@N) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Electrolysis
Materials science General Chemical Engineering Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Perovskite 01 natural sciences 0104 chemical sciences law.invention Dielectric spectroscopy chemistry.chemical_compound Solid Oxide Electrolysis Cell chemistry Chemical engineering law Desorption Electrode Calcination 0210 nano-technology Polarization (electrochemistry) Chemistry::Physical chemistry::Electrochemistry [Science] |
| Popis: | Barium-doped strontium ferrite oxide is a double perovskite where Ba dopant replaces A-site cation to give better electrochemical performance by means of lattice expansion, and therefore can potentially be a stable fuel electrode for high temperature solid oxide electrolysis cells. Ba0.2Sr1.8Fe1.5Mo0.5O6-δ 28 (B2SFMO) double perovskite as fuel electrode was prepared by solution combustion synthesis with the calcination temperature of 1100 oC. Three-electrode half cell was used to evaluate its electrochemical performance under various steam contents in hydrogen atmosphere both under fuel cell mode and electrolysis mode. Electrochemical impedance spectroscopy demonstrated that hydrogen oxidation reaction involved gaseous adsorption/desorption, oxide transport, and charge transfer processes whereas the oxide transport process in water reduction reaction was split into faster and slower processes at low steam-content region. Polarization study showed the monotonously decreased current density in SOFC mode with the increase in the steam content but it displayed the opposite trend in the current density in SOEC mode with the suitable steam content at 20%. Ministry of Education (MOE) Accepted version The authors acknowledge the financial support from a Tier 1 Grant (M4012132) AcRF Grant No: RG 181/18 funded by the Ministry of Education (MOE). The authors are also grateful to Dr. Liu Qinglin for his kind assistance in the experimental setup. |
| Databáze: | OpenAIRE |
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