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• W4280510568 abstract "Unveiling of capacitive behaviors of a material is highly desirable to develop a supercapacitor with a high energy density. In this work, molybdenum dioxide (MoO2) is successfully prepared via a facile hydrothermal method and the different capacitive behaviors of MoO2 in different electrolytes are revealed. Compared to in neutral electrolyte (0.5 molL−1 Na2SO4), MoO2@CF (carbon fibre) electrode has a higher discharge capacitance (509.8 F g−1) in an acidic electrolyte (0.5 molL−1 H2SO4). This is because H+ ion is easier to adsorb on MoO2 than Na+ ion, and H+ ion has a higher diffusion rate than Na+ ion due to its smaller hydration radius. Besides, the charge storage mechanism of MoO2 is mainly composed of surface redox reaction (Faraday capacitance) and ion insertion/extraction reaction (battery capacitance) in acid electrolyte, while electric double-layer capacitors in neutral electrolyte. Nevertheless, the capacitive behaviors of MoO2 in different electrolytes have not been unveiled so far. Additionally, 64.5% of capacitance is still remained after 2500 cycles. Moreover, a flexible asymmetric micro-supercapacitor (ASC) is assembled with MoO2@CF positive electrode and activated [email protected] negative electrode. The ASC can deliver an energy density of 22.90 Wh kg−1 at a power density of 550.5 W kg−1, which is higher than the relative results reported before. Furthermore, the ASC can drive a light-emitting diode (6 mm diameter, red) to work for 5 min after being charged for 5 s. The most importance is that the ASC is low-cost and flexible, which is handy to be embed in other power supply apparatuses." @default.
• W4280510568 created "2022-05-22" @default.
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• W4280510568 date "2022-08-01" @default.
• W4280510568 modified "2023-10-02" @default.
• W4280510568 title "Unveiling capacitive behaviors of MoO2 in different electrolytes and flexible MoO2-based asymmetric micro-supercapacitor" @default.
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• W4280510568 doi "https://doi.org/10.1016/j.est.2022.104833" @default.
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