Abstract
The goal of the current work was to identify an air-side-optimized contact material for La0.3Ca0.7Fe0.7Cr0.3O3−δ (LCFCr) electrodes and a Crofer22APU interconnect for use in reversible solid oxide fuel cells (RSOFCs). LaNi0.6Co0.4−xFexO3 (x = 0–0.3) perovskite-type oxides were investigated in this work. The partial substitution of Co by Fe decreased the thermal expansion coefficient values (TEC) closer to the values of the LCFCr and Crofer 22 APU interconnects. The oxides were synthesized using the glycine–nitrate method and were characterized using X-ray thermodiffraction and 4-probe DC electrical conductivity measurements. Based on the materials characterization results from the Fe-doped oxides investigated here, the LaNi0.6Co0.2Fe0.2O3−δ composition was selected as a good candidate for the contact material, as it exhibited an acceptable electrical conductivity value of 395 S·cm−1 at 800 °C in air and a TEC value of 14.98 × 10−6 K−1 (RT-900 °C).
Highlights
Reversible solid oxide fuel cells (RSOFCs) are green, flexible, and efficient electrochemical devices that function efficiently under both fuel cell and electrolysis modes [1]
To scale up the technology and to obtain higher fuel or energy production or currents, RSOFC stacks are made by connecting several cells in series using metal interconnects
LaNi0.6 Co0.4−x Fex O3−δ (x = 0–0.3) oxides were screened for electrical conductivity, thermal expansion coefficient values (TEC), and chemical compatibility with LCFCr and Crofer 22 APU interconnects to find an optimized contact material for RSOFCs
Summary
Reversible solid oxide fuel cells (RSOFCs) are green, flexible, and efficient electrochemical devices that function efficiently under both fuel cell and electrolysis modes [1]. In the fuel cell mode, RSOFCs generate clean power by electrochemically converting fuels (H2 , hydrocarbons, alcohols, etc.) with O2 from air and function as solid oxide fuel cells (SOFCs); in the electrolysis mode, RSOFCs generate H2 or useful chemicals by utilising excess renewable electricity and function as solid oxide electrolysis cells (SOECs) [1–4]. To scale up the technology and to obtain higher fuel or energy production or currents, RSOFC stacks are made by connecting several cells in series using metal interconnects. Resistance loss of the stack arising due to poor interfacial contact between the electrode and the interconnect is reduced through the use of contact materials. Contact materials are applied between electrodes and interconnects to reduce the interfacial resistance by providing a high electrical conduction path.
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