Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 40, Pages 16035-16041Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm11886b
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2007CB209703]
- Natural Science Foundation of China [20873064]
- Young Teachers Foundation of Anhui University of Technology [QZ201003]
- Natural Science Foundation of Anhui Province [10040606Q07]
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In this work, flower-like hierarchical a-MnO2 sub-microspherical superstructures were synthesized by means of a novel interfacial strategy, where the amphiphilic tri-block poly(ethylene oxide)-b-poly (propylene oxide)-b-poly(ethylene oxide) was used both as a reaction material and a template in an acidic media. Further physical characterizations revealed that the flower-like MnO2 hierarchical superstructures with a specific surface area of 216 m(2) g(-1) were assembled by two-dimension mesoporous nanosheet building blocks and greatly depended upon the synthesis condition. Electrochemical results demonstrated that the unique MnO2 superstructures delivered a specific capacitance of 298 F g(-1) at a current density of 0.117 A g(-1), and even 236 F g(-1) at 2.353 A g(-1), demonstrating their great ability of delivering large energy density at high rates. The good electrochemical capacitance mainly resulted from their unique hierarchical porous structure and rich MnO2-electrolyte interfaces. The unique hierarchical porous structure provided convenient ion transport paths for K+ ions to contact their rich electroactive sites for fast and efficient energy storage.
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