Attempted preparation of La _0.5Ba _0.5MnO _{3− <i>δ</i>} leading to an <i>in-situ</i> formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells

A La0.5Ba0.5MnO3-δ oxide was prepared using the sol-gel technique. Instead of a pure phase, discovered to be combination La0.7Ba0.3MnO3-δ and BaMnO3. The in-situ production La0.7Ba0.3MnO3-δ+BaMnO3 nanocomposites enhanced oxygen vacancy formation compared single-phase La0.7Ba0.3MnO3-δ- or BaMnO3, providing potential benefits as cathode for fuel cells. Subsequently, La0.7Ba0.3MnO3-δ-+BaMnO3 were utilized proton-conducting solid cells (H-SOFCs), which significantly improved cell performance. At 700 oC, an H-SOFC with La0.7Ba0.3MnO3-δ+ BaMnO3 nanocomposite achieved highest power density yet recorded H-SOFCs manganate cathodes: 1504 mW cm-2. This performance much greater than In addition, demonstrated excellent working stability. First-principles calculations indicated that La0.7Ba0.3MnO3-δ/BaMnO3 interface crucial reduction reaction (ORR) free energy barrier lower at surfaces, explained origins high gave guide construction novel cathodes H-SOFCs.