Performance Evaluation of Stretchable Electrode from Orange Peel and Lignin for Flexible Electronics and Energy Storage Applications

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The growing energy crisis and environmental challenges have spurred the development of sustainable energy storage solutions. This study synthesizes 3D porous Orange Peel-Lignin activated carbon (OPLAC) from orange peel waste and lignin using a two-step pyrolysis process with KOH activation. The OPLAC was combined with styrene-isoprene-styrene (SIS) and SUPER P conductive carbon black to create stretchable electrode composites with varying compositions (70:20:10, 60:30:10, and 50:40:10). Mechanical testing revealed that increasing the SIS content improved stretchability, with the 50:40:10 composition achieving 300% strain and retaining 95% durability after 100 cycles. However, higher SIS content reduced electrical conductivity, with the 70:20:10 composition showing the highest conductivity (12 S/cm) and the 50:40:10 the lowest (7 S/cm). The 60:30:10 composition offered a balance between flexibility and conductivity. These results demonstrate the potential of biomass-derived activated carbon for sustainable, high-performance supercapacitor electrodes, particularly for flexible electronics and wearable devices, while highlighting the valorization of agricultural and industrial waste in energy storage applications. Keywords: Stretchable electrode, activated carbon, orange peel waste, Lignin, flexible electronics

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Materials Science Forum (Volume 1189)

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129-140

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May 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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