Sr- and Fe-substituted LaMnO3 Perovskite: Fundamental insight and possible use in asymmetric hybrid supercapacitor

The symmetry or structural stability of ABO3-type perovskite oxides depends largely on the size ‘A’ and ‘B’ cations, which determines material properties. partial substitution these cations may be used to tune ionic sizes valence states play an important role in improving properties perovskite. In this study, La3+ with Sr2+ a larger radius Mn3+ Fe3+with similar favored both crystal mixed ionic–electronic conductivity Electrodes based La0.7Sr0.3Mn0.5Fe0.5O3 (LSMFO55) exhibited faradaic behavior specific capacity 330 C g?1 (92 mAh g?1) at 12C rate, while electrode maintained 259 240C (charge discharge 15 s). Additionally, exohedral carbon nano-onions (CNO) were introduced as negative design asymmetric hybrid supercapacitor (AHS) widened cell voltage. use CNO AHS improved rate capability drastically compared rGO. This device good energy density even extra-high charging (600C) owing its outstanding capability. high-rate performance LSMFO55//CNO can elucidated by successful fabrication conductive positive electrode. Tuning electronic conductivities cationic adopting appropriate carbon-derived (such CNO) provide practical using various perovskites.