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We have synthesized and characterized perovskite-type SrCo0.9 Nb0.1 O3-δ (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 F cm(-3) (and gravimetric capacitance of ca. 773.6 F g(-1) ) at a current density of 0.5 A g(-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.
Zhu et al. (Fri,) studied this question.
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