Operation Protocols To Improve Durability of Protonic Ceramic Fuel Cells

To develop reliable and durable protonic ceramic fuel cells (PCFCs), the impacts of the operation protocols of PCFCs on the cell durability are investigated through analyses of the main degradation mechanisms. We herein propose three appropriately designed control protocols, including cathode air depletion, shunt current, and fuel cell/electrolysis cycling, to fully circumvent the operating-induced degradation of PCFCs. For this purpose, anode-supported cells, comprised of a NiO–BaCe0.7Zr0.1Y0.1Yb0.1O3−δ anode, BaCe0.7Zr0.1Y0.1Yb0.1O3−δ electrolyte, and NdBa0.5Sr0.5Co1.5Fe0.5O5+δ–Nd0.1Ce0.9O2−δ composite cathode, are prepared, and their long-term performances are evaluated under a galvanostatic condition of 0.5 A·cm–2 at 650 °C. The cell voltages of the protected cells using the operation protocols to prevent performance degradation are stably maintained under the applied current density for more than 1200 h without any noticeable degradation, whereas the performance of the unprotected cell gradually decr...