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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18408
Title: High-performance, high energy density symmetric supercapacitors based on δ-MnO2 nanoflower electrodes incorporated with an ion-conducting polymer
Authors: Dalvi, Anshuman
Keywords: Physics
Composite solid polymer electrolyte (CSPE)
Supercapacitors
Light-emitting diodes (LEDs, 3 V)
Polymers
Issue Date: Nov-2024
Publisher: RSC
Abstract: The present work investigates liquid-based and liquid-free supercapacitors assembled using δ-MnO2-nanoflower-based electrodes. An optimized electrode composition was prepared using acetylene black (AB), a polymer (PEO), a salt (LiClO4), and δ-MnO2 and used for device fabrication. The composite electrode was tested against a liquid electrolyte and a ‘liquid-free’ composite solid polymer electrolyte (CSPE) membrane. In a three electrode geometry, with 1 M solution of LiClO4 as an electrolyte, the specific capacitance of the electrode was found to be ∼385 F g−1, with a specific energy of ∼23 W h kg−1 and specific power of ∼341 W kg−1 (at 1 mA, 1 V). Dunn's method confirmed that the charge storage process was predominantly pseudocapacitive. When the device was assembled in a two-electrode Swagelok cell, a stable specific capacitance of ∼216 F g−1 was observed with a specific energy of 30 W h kg−1 and a specific power of 417 W kg−1. The supercapacitors exhibited stable performance up to ∼7000 cycles with ∼90% capacitance retention and ∼97% coulombic efficiency. A combination of these cells could light two white light-emitting diodes (LEDs, 3 V) for at least ∼10 minutes. Further, all-solid-state supercapacitors (ASSCs) were fabricated using a Li+ ion (CSPE) membrane. The ASSCs exhibited a specific capacitance of ∼496 F g−1 after ∼500 cycles, with a specific energy and power of ∼19 W h kg−1 and ∼367 W kg−1, respectively. The investigation reveals that the electrodes are versatile and show compatibility with liquid and solid electrolytes. The polymer in the electrode matrix plays an important role in enhancing device performance.
URI: https://pubs.rsc.org/en/content/articlehtml/2024/ra/d4ra05670a
http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18408
Appears in Collections:Department of Physics

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