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- W2042118889 abstract "Lamellar birnessite-type MnO2 materials were prepared by changing the pH of the initial reaction system via hydrothermal synthesis. The interlayer spacing of MnO2 with a layered structure increased gradually when the initial pH value varied from 12.43 to 2.81, while the MnO2, composed of α-MnO2 and γ-MnO2, had a rod-like structure at pH 0.63. Electrochemical studies indicated that the specific capacitance of birnessite-type MnO2 was much higher than that of rod-like MnO2 at high discharge current densities due to the lamellar structure with fast intercalation/deintercalation of protons and high utilization of MnO2. The initial specific capacitance of MnO2 prepared at pH 2.81 was 242.1 F g−1 at 2 mA cm−2 in 2 mol L−1 (NH4)2SO4 aqueous electrolyte. The capacitance increased by about 8.1% of initial capacitance after 200 cycles at a current density of 100 mA cm−2." @default.
- W2042118889 created "2016-06-24" @default.
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- W2042118889 date "2010-02-01" @default.
- W2042118889 modified "2023-09-25" @default.
- W2042118889 title "Preparation and electrochemical properties of lamellar MnO2 for supercapacitors" @default.
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- W2042118889 doi "https://doi.org/10.1016/j.materresbull.2009.09.016" @default.
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