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This work highlights the possibility of the application of YBaCo4O7+δ-modified materials as cathodes for solid oxide fuel cells based on protonic electrolytes. To reach this goal, the basic YBaCo4O7+δ oxide material and its YBaCo3.5Zn0.5O7+δ (YBCZ) and YBaCo3.5Fe0.5O7+δ (YBCF) substituted members were successfully synthesized and their structural, thermal and electrochemical properties were evaluated...