Interfacial\nModification for High-Efficient Reversible\nProtonic Ceramic Cell with a Spin-Coated BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.2</sub>O<sub>3−δ</sub> Electrolyte\nThin Film

Slurry spin coating is an effective\napproach for the fabrication\nof protonic ceramic electrolyte thin films. However, weak adhesion\nbetween the electrode and spin-coated electrolyte layers in electrochemical\ncells due to the low sinterability of the proton-conducting perovskite\nmaterials usually lead to a high interfacial resistance and thus a\nlow performance. Herein, we report a method to improve the interfacial\nconnection and boost the performance of protonic ceramic cells based\non a BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.2</sub>O<sub>3−δ</sub> (BZCY) electrolyte. Ni-BZCY anode functional layer, BZCY electrolyte\nlayer and La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−δ</sub>-BZCY cathode functional layer are all\nfabricated by slurry spin coating. The electrode functional layers\nand the components of the electrolyte slurry influence the microstructure of the single cell and the kinetics\nof the electrochemical processes significantly. A peak power density\nof 2345 mW cm<sup>–2</sup> is achieved at 700 °C in the\nfuel cell mode, and a current density of –3.0 A cm<sup>–2</sup> is obtained at an applied voltage of 1.3 V in the electrolysis mode.