Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 628, Issue -, Pages 682-690Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.08.106
Keywords
Poly(azure C); In-situ polymerization; Prussian blue analogue; Long cycling life; Super capacitor
Categories
Funding
- Natural Science Foundation of Jiangsu Province, China [BK20171309]
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Polymer-coated Prussian blue analogues exhibit enhanced performance with ultrahigh specific capacitance, superior rate performance, and excellent long-cycling stability. Fabricated asymmetric supercapacitors maintain high capacitance retention and demonstrate superior specific energy.
Prussian blue analogues are considered as promising supercapacitor electrode materials due to their high theoretical capacitance and low cost. Yet, they suffer from poor electronic conductivity and cycling life. Here, a redox dye polymer, poly(azure C) (PAC), is in-situ grown uniformly on CoFe Prussian blue analogue (CoFePBA). As a polymer mediator, the PAC coating on each PBA not only enhances the electronic conductivity and surface area, but also improves the structural stability and specific capacitance of PBA. As a result, the optimized CoFePBA@PAC possesses ultrahigh specific capacitance (968.67 F g(-1) at 1 A g(-1)), superior rate performance (665.78 F g(-1) at 10 A g(-1)), and excellent long-cycling stability (92.45% capacity retention after 2000 cycles). As an application, a fabricated CoFePBA@PAC//AC asymmetric supercapacitor (AC = activated carbon) maintains 84.7% capacitance retention in 2000 cycles at 1 A g(-1) and displays a superior specific energy of 29.16 W h kg(-1) at the power density of 799.78 W kg (-1). These results demonstrate that redox dye polymer-coated PBAs with outstanding performance have a promising prospect in the field of energy storage. (C) 2022 Elsevier Inc. All rights reserved.
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