Electrochemical properties of ceria-based intermediate temperature solid oxide fuel cell using microwave heat-treated La0.1Sr0.9Co0.8Fe0.2O3−δ as a cathode
| Autor: | Heesung Yoon, Sang-Yun Jeon, Eric D. Wachsman, M.-B. Choi, Kang Taek Lee, Sun-Ju Song |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Diffusion Analytical chemistry Oxygen transport Energy Engineering and Power Technology chemistry.chemical_element Partial pressure Electrochemistry Cathode law.invention Dielectric spectroscopy chemistry law Solid oxide fuel cell Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 220:377-382 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2012.07.122 |
| Popis: | The temperature dependence of the chemical diffusion coefficient and the surface exchange coefficient of LSCF1982 is successfully determined from the D.C. conductivity relaxation in the temperature range of 500 ≤ T/°C ≤ 700 and an oxygen partial pressure of 0.21 atm. The kinetic values of chemical diffusion coefficient ( D ˜ ) and surface exchange coefficient (k) are 1.85 × 10−5 cm2 s−1 and 2.42 × 10−4 cm s−1 at 650 °C, respectively. The electrochemical properties of La0.1Sr0.9Co0.8Fe0.2O3−δ (LSCF1982) as a cathode for ceria based IT-SOFC are successfully characterized by I–V performance measurement and electrochemical impedance spectroscopy (EIS) in terms of cathode microstructure effects by using microwave heat treatment. The cell with microwave heat-treated cathode shows the higher performance than conventional heat treated cathode. At 650 °C the open circuit potential (OCP) and maximum power density are respectively 0.753 V and 1.79 W cm−2 under 150 sccm of wet hydrogen and air gas flow conditions, and the ohmic and electrode area specific resistance (ASR) are 0.037 and 0.014 Ω cm2, respectively. |
| Databáze: | OpenAIRE |
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