This research explores the use of biosourced and biodegradable quinones, Sepia melanin and catechin/tannic acid (Ctn/TA), as electrode materials for high-performance electrochemical capacitors. These materials, solution-deposited on chemically treated carbon paper (TCP), exhibit high capacitance (1355 mF cm⁻² for Sepia melanin and 898 mF cm⁻² for Ctn/TA), excellent cycling stability (100% capacitance retention over 50,000 and 10,000 cycles, respectively), and high power densities (up to 1274 mW cm⁻² for Sepia melanin and 727 mW cm⁻² for Ctn/TA). The enhanced performance is attributed to interface engineering, where the chemical treatment of carbon paper improves surface area, porosity, and electrolyte wettability.

Abdelaziz Gouda, Alexandre Masson, Molood Hoseinizadeh, Francesca Soavi, Clara Santato