TY - JOUR
AU - Smaran, Kumar Sai
AB - An adoption of a redox-active species can be instrumental in enhancing the specific capacitance of electrical double layer capacitors (EDLCs). Nitrogen-self-doped activated carbon (NDAC), derived from jack bean meal, exhibits a consistent distribution of nitrogen throughout a graphitized carbon framework, making it an ideal electrode for EDLCs. To enhance its capacitive properties, we integrated it with the redox additive para-phenylenediamine (PPD) and a gel polymer electrolyte made of poly (vinyl alcohol) and potassium hydroxide (PVA-KOH). Overlapping operative potential range of PPD with NDAC was the selection criterion. Further, the effects of concentration-dependent performance analysis interlinking PPD and PVA-KOH was evaluated via electrochemical studies. In a three-electrode setup, 25 mM PPD increased the specific capacitance six-fold to 835 F g−1 at 1 A g−1. Dunn’s deconvolution analysis revealed a predominantly diffusive charge storage mechanism (75.8%), confirming the redox-active contributions. In a two-electrode symmetric supercapacitor, a blended gel polymer electrolyte of PVA-KOH and PPD delivered 179.94 F g−1 at a current density of 1 A g−1, demonstrating 77.5% capacitance retention and 99.4% coulombic efficiency after 10 000 cycles at 40 A g−1. Voltage-holding and self-discharge (SD) studies confirmed excellent stability, low leakage current, and minimal SD. It was identified that 10 mg of PPD was an ideal concentration, enabling an energy density of 35.99 Wh kg−1 at a power density of 900 W kg−1. Thus, the results emphasized the synergy between PPD blended gel polymer electrolytes and NDAC as an ideal combination for high-performance supercapacitors.
TI - High energy density symmetric supercapacitors coupling redox-active gel polymer electrolytes with N-doped carbons
JF - Nanotechnology
DO - 10.1088/1361-6528/ade71f
DA - 2025-07-07
UR - https://www.deepdyve.com/lp/iop-publishing/high-energy-density-symmetric-supercapacitors-coupling-redox-active-Sm6AEaHg2C
VL - 36
IS - 27
DP - DeepDyve
ER -