These results show that composite materials have great application potential in high-performance supercapacitors. Insert text object and edit the color, font, size, margin, columns, line spacing, text wrap, bullets/lists and more. Apply delicate clipart to make the page looks amazing. ASCs (M = Cu, Mn) devices display excellent electrical materials in terms of high energy density (41.34 and 38.75 Wh Kg-1 at 8000W Kg-1), cycle stability (Cs retention rate of 84.74% and 80.4%, coulomb efficiency of 80.15% and 83.69%). Support almost all formats like JPG, TIFF, PNG, GIF, PDF, EPS, AI, SVG, etc. The asymmetric supercapacitors (ASCs) device assembled with (M = Cu, Mn) electrode as the positive one, active carbon (AC) as the negative one and 6 M KOH as the electrolyte can work stably in a broad voltage range of 0-1.6 V. Due to the particularity of the electrode material structure, the (M = Cu, Mn) electrode has a high specific capacitance (Cs, 2978.1 F g−.4 F g-1 at 1 A g-1) and the Cs retention rate exceeds 90% after 10000 cycles. The as-prepared (M = Cu, Mn) electrode materials are characterized by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and high-resolution transmission electron microscopy (HRTEM), X-ray Diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). MC nanowires and MS nanosheets grow vertically on NF as the core by hydrothermal and calcination methods and PPy film covered on the surface of (M = Cu, Mn) as the shell via the chemical bath method to form a 3D self-supporting nanoflower-liked composite materials. Herein, we synthesize 3D nanoflower-liked M = Cu, Mn) core-shell composites on nickel foam (NF).
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