Preparation of Nitrogen-Doped Porous Carbon Nanofibers via Electrospinning of Coffee Waste for EDLC Supercapacitors

초록

Herein, N-doped porous carbon nanofibers are synthesized from waste coffee grounds and applied as active electrode materials for electric double-layer capacitors (EDLCs). In detail, waste coffee grounds are mixed with polyacrylonitrile (PAN) and dissolved in N,N-dimethylformamide (DMF) to prepare the precursor solution. The solution is then electrospun at an operating voltage of 15 kV to synthesize waste coffee-based nanofibers (WC-NFs), followed by carbonization at 900 ℃ under a nitrogen atmosphere to obtain waste coffee-derived carbon nanofibers (WC-CNFs). The as-fabricated WC-CNFs are used as EDLC electrodes, exhibiting a high specific capacitance of 123.3 F g-1 at a current density of 1 A g-1. The high specific capacitance is attributed to N-doping and the porous structure. Hence, this study investigates the potential of waste coffee recycling for the development of eco-friendly energy storage devices. 본 연구는 2025년도 산업통상자원부 및 산업기술기획평가원(KEIT) 연구비 지원에 의한 연구임(RS-2022-0015 6073)