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- W2803200511 abstract "In this work, we report a birnessite-MnO2/ramsdellite-MnO2/F_SnO2 (FTO) composite planar electrode with 3D peony-like micro-structure for micro-supercapacitors (m-SCs), which is prepared via an original series resistor electrochemical deposition (SRED) of MnO2 and subsequent secondary-growth. The composite electrode achieves an excellent specific capacitance of 1261 F g-1 at 10 A g−1 and extraordinary cycling stability with a significant 304% capacity retention after 10000 GCD cycles. Different from conventional cases, even though it is Mn+4, the MnO2 prepared by the SRED would undergo a secondary-growth with phase transition process during the GCD cycling, which could dramatically improve the pseudocapacitance performance by surface/inner-surface and diffusion-controlled insertion capacity aspects. The mechanism is in-depth discovered by deconvolution of double-layer and Faradaic insertion capacity at different stages of the phase transition, and first principle calculation based on density functional theory (DFT). The secondary-growth process also offers a fabulous self-repairing feature of the SC electrode materials, which caters the maintenance-free and long-life requirement of the m-SCs application. Scan rate dependency of the bulk and the surface/near-surface pseudocapacitance is confirmed via de-convoluted the total capacities and the redox peaks of CV curves with different scan rates." @default.
- W2803200511 created "2018-06-01" @default.
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- W2803200511 date "2018-08-01" @default.
- W2803200511 modified "2023-10-16" @default.
- W2803200511 title "In-depth study of electrochemical capacitor performance of MnO2 during phase transition from Ramsdellite-MnO2 to Birnessite-MnO2" @default.
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- W2803200511 doi "https://doi.org/10.1016/j.electacta.2018.05.110" @default.
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