Oxygen‐Deficient Double Perovskite Eu 1.5 Sr 0.5 FeMnO 6 : Bifunctional Hydrogen and Oxygen Elect
Soumyajit Patra, Satakshi Subhadarsini, Nibedita DasABSTRACT
Bifunctional oxide electrocatalyst, Eu 1.5 Sr 0.5 FeMnO 6, namely ESFMO, catalyzing both half reactions of water splitting, oxygen evolution, and Hydrogen evolution reactions, is reported. The result was compared with its counterpart, Eu 2 FeMnO 6 (EFMO). Compounds were synthesized using the sol‐gel method. The skeletal features and the morphology of the catalysts in their untreated condition are examined using XRD, SEM, TEM, and XPS. The oxygen‐deficient ESFMO catalyst shows improved HER and OER activities compared with EFMO, with overpotentials of 364 mV and 408 mV, respectively, at a current density of 10 mA cm − 2 . The enhanced electrocatalytic effectiveness of ESFMO, characterized by A‐site Sr substitution leading to oxygen deficiency with a level of Mn 3+ /Mn 4+ redox couple, as demonstrated by XPS measurements. This study explores the intriguing relationships among structure, charge transport, and electrocatalytic activity in the context of water splitting, highlighting the influence of structural features and defects on charge transport mechanisms.