Camphor sulfonic acid assisted synthesis of polythiophene composite for high energy density all-solid-state symmetric supercapacitor
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Here, we report a high energy density all-solid-state symmetric supercapacitor (SSC) based on polythiophene/Al2O3 (PTCA) composite synthesized via camphor sulfonic acid assisted chemical polymerization of thiophene. An electrochemical study showed that polythiophene/50%Al2O3 (PTCA5) composite electrode exhibits the highest gravimetric specific capacitance of 780.40 Fg−1 at 0.5 Ag−1 in three electrode system. Subsequently, the all-solid-state symmetric supercapacitor (SSC) fabricated using PTCA5 electrode achieved a specific capacitance of 472.8 Fg−1 at 1 Ag−1 using PVA-KOH gel as an electrolyte. Moreover, SSC showed excellent cyclic performance with 90.54% capacitance retention of its initial capacitance even after 5000 cycles. Additionally, a superior specific energy density of 58.04 Whkg−1 was obtained at a specific power density of 533.02 Wkg−1 for the same. This high potential and high energy density device find its application in the low-cost energy storage devices. Encouragingly, the fabricated SSC is utilized to light a commercial red LED effectively to validate the real usage.
The author would like to thank Mangalore University for providing Research fellowship. Also, authors thankfully acknowledge CENSE of IISC at Bangalore, PURSE lab of Mangalore University and the director of STIC at Cochin University for providing characterization facility.
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