Interdigitated Microsupercapacitors and Flexible Conducting Wires Enabled by Less‐Defective Graphene Prepared Via a Green Ball‐Milling Approach

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Herein, a green and facile approach is demonstrated for synthesizing less‐defective graphene via ethyl cellulose (EC)‐assisted mechanochemical treatment of graphite using ball milling. Structural analysis reveals that the produced graphene exhibits a few‐layered turbostratic structure with minimal defects, making it highly conducting, suitable for various electronic and electrical applications. Functionalization at the edges of the graphene sheets restricts restacking and improves dispersibility in green solvents. The as produced graphene‐based conducting wires, demonstrate reliable performance in electric circuits, effectively powering LEDs without any loss of efficiency, even in highly flexible configurations. Additionally, an interdigitated microsupercapacitor (MSC) constructed using the less‐defective graphene exhibits an areal capacitance of 1151 µF cm − 2 at 10 μA cm − 2 , coupled with excellent cycle life (95.5% capacitance retention after 3000 cycles). The MSC also shows an energy density of 28.5 mWh kg −1 , a power density of 1108.28 mW kg −1 , and a remarkable rate capability of 93%. These results highlight the potential of the less‐defective, edge‐functionalized graphene as a promising material for both flexible electronics and microenergy storage devices, offering sustainable, high‐performance solutions for future energy storage systems and electronic applications.

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