Abstract
The perovskite-type SrMn0.875Nb0.125O3 (SMN) and SrCo0.875Nb0.125O3 (SCN) materials are prepared through the solid-state reaction method as novel oxygen-intercalated electrode materials for supercapacitor. The crystal structure, powder morphology, and electrochemical performance have been characterized in detail. SMN exhibits a six-layer hexagonal (6H) structure with space group P63/mmc, while SCN shows the tetragonal structure of space group P4/mmm. Under the three-electrode system with 1 M Na2SO4 neutral electrolyte solution, the specific capacitance (Cs) of SCN can reach 894 mF cm−2 at 1 mA cm−2, which is 4.7 times the value of SMN at the same condition. For SCN, the superiority of electrochemical performance is attributed to its porous surface morphology, perovskite structure with shorter BO bond length and large B-O-B bond angle, and a higher oxygen vacancy content. When combined with activated carbon (AC) electrode, the SCN//AC asymmetric supercapacitor with a working voltage of 2.0 V presents a specific energy density of 82.33 μWh cm−2, while maintaining prominent cycling stability with a capacity retention of 88.88% after 10,000 cycles.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
