Publication | Open Access
Attempted preparation of La <sub>0.5</sub>Ba <sub>0.5</sub>MnO <sub>3− <i>δ</i> </sub> leading to an <i>in-situ</i> formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells
116
Citations
56
References
2023
Year
Manganate CathodesEngineeringOxygen Vacancy FormationChemistryInorganic MaterialMaterials ScienceMaterials EngineeringBattery Electrode MaterialsOxide ElectronicsAdvanced Electrode MaterialManganate NanocompositesEnergy StorageElectrochemical ProcessElectrochemistryOxygen Reduction ReactionSol-gel TechniqueCathode MaterialsElectrochemical Energy StorageBatteriesAttempted PreparationFunctional Materials
A La<sub>0.5</sub>Ba<sub>0.5</sub>MnO<sub>3-δ</sub> oxide was prepared using the sol-gel technique. Instead of a pure phase, La<sub>0.5</sub>Ba<sub>0.5</sub>MnO<sub>3-δ</sub> was discovered to be a combination of La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub> and BaMnO<sub>3</sub>. The in-situ production of La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>+BaMnO<sub>3</sub> nanocomposites enhanced oxygen vacancy formation compared to single-phase La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>- or BaMnO<sub>3</sub>, providing potential benefits as a cathode for fuel cells. Subsequently, La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>-+BaMnO<sub>3</sub> nanocomposites were utilized as the cathode for proton-conducting solid oxide fuel cells (H-SOFCs), which significantly improved cell performance. At 700 <sup>o</sup>C, an H-SOFC with a La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>+ BaMnO<sub>3</sub> nanocomposite cathode achieved the highest power density yet recorded for H-SOFCs with manganate cathodes: 1504 mW cm<sup>-2</sup>. This performance was much greater than the single-phase La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub> or BaMnO<sub>3</sub> cathode cells. In addition, the cell demonstrated excellent working stability. First-principles calculations indicated that the La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>/BaMnO<sub>3</sub> interface was crucial for the enhanced cathode performance. The oxygen reduction reaction (ORR) free energy barrier was significantly lower at the La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub>/BaMnO<sub>3</sub> interface than at the La<sub>0.</sub><sub>7</sub>Ba<sub>0.</sub><sub>3</sub>MnO<sub>3-δ</sub> or BaMnO<sub>3</sub> surfaces, which explained the origins of the high performance and gave a guide for the construction of novel cathodes for H-SOFCs.
| Year | Citations | |
|---|---|---|
Page 1
Page 1