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Perovskite SrCo 0.9 Nb 0.1 O 3− δ as an Anion‐Intercalated Electrode Material for Supercapacitors with Ultrahigh Volumetric Energy Density
Author(s) -
Zhu Liang,
Liu Yu,
Su Chao,
Zhou Wei,
Liu Meilin,
Shao Zongping
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201603601
Subject(s) - supercapacitor , gravimetric analysis , capacitance , electrolyte , electrode , perovskite (structure) , materials science , current density , ion , chemical engineering , inorganic chemistry , chemistry , physics , organic chemistry , quantum mechanics , engineering
Abstract We have synthesized and characterized perovskite‐type SrCo 0.9 Nb 0.1 O 3− 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.