SOFC/SOEC Button Cell (D=15-25 mm) Test Fixture, CSOFECBCTF
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A button cell test fixture (or "test rig") is the central piece of hardware for evaluating the electrochemical performance of single-cell SOFC/SOEC samples. It provides the necessary atmosphere control, electrical connectivity, and temperature stability required for I-V curves and Electrochemical Impedance Spectroscopy (EIS).
A standard fixture consists of four primary subsystems: (1) Manifold/Housing: Typically made of high-purity Alumina (Al2O3) to prevent chromium poisoning from stainless steel at high temperatures (>700°C). (2) Sealing Mechanism: Uses springs to push the cell against a Gold or Silver O-ring or a mineral gasket. (3) Glass/Ceramic: Uses a specialized glass sealant that melts to create a hermetic seal between the fuel and air chambers. (4) Current Collectors: Platinum, Gold, or Silver meshes and wires that press against the electrodes to extract current. (5) Gas Delivery: Inner and outer tubes that deliver precisely metered gases (e.g., humidified H2, CO2, or Air) directly to the electrode surfaces.
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References:
- M. Shiraki, et al., Efficiency Calculations for SOFC/SOEC Reversible System and Evaluations of Performances of Button-Size Anode-Supported Cell, ECS Trans., 2013, 57, 3261.
- C. M. Priest, et al., Challenges in practical button cell testing for hydrogen production from high temperature electrolysis of water, Front. Energy Res., 2023, 11, DOI: 10.3389/fenrg.2023.1278203.
