Lattice modification by incorporating heteroatoms could effectively and precisely tune their intrinsic properties to get improved sinterability and electrochemical performance. Here, by introducing Cu 2+ into the interstitial position of a ABO 3 -type perovskite, a 2 times higher protonic conductivity (1.9 × 10 −2 S cm −1 at 700 °C) and lowtemperature (1200 °C) sinterability were achieved for the BaCe 0.68 Zr 0.1 Y 0.1 Yb 0.1 Cu 0.02 O 3−δ (BCZYYC2) electrolyte, compared to the precursor electrolyte. Meanwhile, the modified BCZYYC2 also exhibits excellent chemical stability in high-temperature and high-humidity conditions, as well as good compatibility with the components of cell. When used as the electrolyte in reversible fuel cell (FC)/electrolysis cell (EC) operational modes, the reversible solid oxide cell with the BCZYYC2 electrolyte illustrates prominent FC (0.85 W cm −2 at 700 °C) and EC (−1.96 A cm −2 at 700 °C and 1.3 V) performances with high film−electrolyte conductivity (8.7 × 10 −3 S cm −1 at 700 °C). Additionally, an obvious increase in current density is observed during the short-term stability test, which has shown great promise for their practical application. KEYWORDS: BaCe 0.68 Zr 0.1 Y 0.1 Yb 0.1 Cu 0.02 O 3−δ , protonic conductivity, sinterability, stability, reversible solid oxide cells
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