Journal
MOLECULES
Volume 27, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/molecules27010329
Keywords
CO2-laser-induced graphene; ionic electrolyte; micro-supercapacitor
Funding
- DLR/DAAD Fellowship Program [91752702, 363]
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This study reports the optimization and fabrication of micro-supercapacitors using laser-induced interdigital structured graphene electrodes. The manufactured micro-supercapacitors show a wide stable potential window and good cyclic stability, indicating their potential in peak energy storage.
The rapidly developing demand for lightweight portable electronics has accelerated advanced research on self-powered microsystems (SPMs) for peak power energy storage (ESs). In recent years, there has been, in this regard, a huge research interest in micro-supercapacitors for microelectronics application over micro-batteries due to their advantages of fast charge-discharge rate, high power density and long cycle-life. In this work, the optimization and fabrication of micro-supercapacitors (MSCs) by means of laser-induced interdigital structured graphene electrodes (LIG) has been reported. The flexible and scalable MSCs are fabricated by CO2-laser structuring of polyimide-based Kapton (R) HN foils at ambient temperature yielding interdigital LIG-electrodes and using polymer gel electrolyte (PGE) produced by polypropylene carbonate (PPC) embedded ionic liquid of 1-ethyl-3-methyl-imidazolium-trifluoromethansulphonate [EMIM][OTf]. This MSC exhibits a wide stable potential window up to 2.0 V, offering an areal capacitance of 1.75 mF/cm(2) at a scan rate of 5.0 mV/s resulting in an energy density (E-a) of 0.256 mu Wh/cm(2) @ 0.03 mA/cm(2) and power density (P-a) of 0.11 mW/cm(2) @0.1 mA/cm(2). Overall electrochemical performance of this LIG/PGE-MSC is rounded with a good cyclic stability up to 10,000 cycles demonstrating its potential in terms of peak energy storage ability compared to the current thin film micro-supercapacitors.
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