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• W3083778082 abstract "Single-atom Ag-decorated MnO2 hollow microspheres (Ag-MnO2 HMSs) with oxygen vacancies are successfully fabricated via a self-template strategy and redox etching method. The transmission electron microscopy images and nitrogen-sorption analyses reveal that the as-prepared Ag-MnO2 HMSs exhibit a porous peanut-like hollow structure with a large specific surface area (∼240 m2 g–1). High-angle annular dark-field scanning transmission electron microscopy confirms that Ag species exist as isolated single atomic sites. The electrochemical experiments show that the 0.3% Ag-MnO2 HMS electrode delivers high specific capacitance (297.5 F g–1 at 0.3 A g–1), 66.3% higher than that of MnO2 HMSs (178.9 F g–1 at 0.3 A g–1), and excellent cycling stability (88.1% capacitance retention after 9000 cycles). Moreover, the assembled Ag-MnO2 HMSs//AC solid-state asymmetric supercapacitor achieves a high operation voltage of 2.0 V and exhibits a high energy density of 15.9 W h kg–1 at a power density of 250.3 W kg–1. Besides, the device can successfully light up a light-emitting diode. The experimental results demonstrate that an appropriate amount of single-atom Ag in MnO2 HMSs promotes the formation of oxygen vacancies, which can improve the conductivity of MnO2 HMSs and the charge storage at Mn and O sites, thereby improving the capacitance performance of MnO2 HMSs." @default.
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• W3083778082 date "2020-09-07" @default.
• W3083778082 modified "2023-10-17" @default.
• W3083778082 title "Preparation of Single-Atom Ag-Decorated MnO₂ Hollow Microspheres by Redox Etching Method for High-Performance Solid-State Asymmetric Supercapacitors" @default.
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• W3083778082 doi "https://doi.org/10.1021/acsaem.0c01969" @default.
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