Lignin which is the second most abundant natural polymer is found to be the most promising candidate for environmentally benign energy storage materials because of its high carbon content, biodegradability, favorable functionality and economic feasibility. Also, the valorization of lignin (to produce something useful like materials, energy or chemicals) is considered as an effective way to minimize our reliance on depletion non-renewable energy sources and to explore novel feedstock for energy storage/conversion device. Here, we have prepared lignin incorporated PAN nanofibers as porous freestanding electrode material and have synthesized lignin based hydrogel electrolyte by crosslinking it with chemical crosslinker. Ultimately we have fabricated all-solid-state flexible supercapacitor exhibiting a maximum energy density and power density of 4.49 Wh kg<sup>-1</sup> and 2.63 kW kg<sup>-1</sup>, respectively by integrating the lignin-PAN nanofiber electrode and lignin hydrogel electrolyte. Our approach of using wood biomass based renewable materials for the flexible energy storage devices is expected to contribute to the expansion of sustainable chemistry.

Renewable flexible supercapacitor based on lignin electrode and electrolyte

2019 Fall National Meeting

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