Perovskite SrCo0.9Nb0.1O3-delta as an Anion-Intercalated Electrode Material for Supercapacitors with Ultrahigh Volumetric Energy Density

摘要

We have synthesized and characterized perovskite-type SrCo0.9Nb0.1O3-delta (SCN) as a novel anion-intercalated electrode material for supercapacitors in an aqueous KOH electrolyte, demonstrating a very high volumetric capacitance of about 2034.6 Fcm(-3) (and gravimetric capacitance of ca. 773.6 Fg(-1)) at a current density of 0.5 Ag-1 while maintaining excellent cycling stability with a capacity retention of 95.7% after 3000 cycles. When coupled with an activated carbon (AC) electrode, the SCN/AC asymmetric supercapacitor delivered a specific energy density as high as 37.6 Wh kg(-1) with robust long-term stability.