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• W2998991775 startingPage "124028" @default.
• W2998991775 abstract "State-of-the-art aqueous-KOH-based asymmetric supercapacitors (ASCs) that have been reported thus far suffer from a low operating potential and low energy density that is bottlenecked by a theoretical voltage limit for water decomposition (1.23 V). Therefore, optimizing low-cost active electrode materials in an appropriate architecture is essential for developing advanced and cost-effective ASCs that resolve the hindrances listed above. Herein, a multicore-shell hierarchical nanoarchitecture with an outer shell formed from phase-selective growth of monoclinic α-MnO2, containing 2D tunnels within the lattice, and birnessite δ-MnO2, containing infinite-2D sheets, and a carbon-coated zinc-nickel-cobalt-based ternary metal oxide as a core ((α + δ)MnO2@[email protected]) is successfully designed and characterized. An ASC with (α + δ)MnO2@[email protected] as a positive electrode and zeolitic imidazolate framework (ZIF-8) implanted B and N-doped electrospun carbon nanofibers (Z-BN-CNFs) as a negative electrode exhibits an ultrahigh energy density of 79.8 W h kg−1 at a power density of 846.18 W kg−1 along with a maximum power density of 42.48 kW kg−1 at a high energy density of 53.1 W h kg−1. Furthermore, a capacitance retention of 66.5% with a current density from 1 to 50 A g−1 and an excellent cyclic stability of 95.2% capacitance retention after 10 000 continuous charge-discharge cycles are also observed. The present success of fabricating a 1.7 V aqueous-KOH-based ASC with ultrahigh energy density will pave the way for new research toward low-cost ASCs with a high operating potential and high energy density." @default.
• W2998991775 created "2020-01-23" @default.
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• W2998991775 date "2020-05-01" @default.
• W2998991775 modified "2023-10-06" @default.
• W2998991775 title "A multicore-shell architecture with a phase-selective (α + δ)MnO2 shell for an aqueous-KOH-based supercapacitor with high operating potential" @default.
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• W2998991775 doi "https://doi.org/10.1016/j.cej.2020.124028" @default.
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