Biomass waste conversion into low-cost carbon-based materials for supercapacitors: A sustainable approach for the energy scenario

Biomass upgrading is a promising approach to face the current energy consumption and chemicals production. Lignocellulosic biomass residues have taken lead in this field. In study, hemp residue-based activated carbons (ACs) were prepared by H3PO4-assisted hydrothermal carbonization (HTC) using low concentration of H3PO4 (25 wt%). ACs with high porosity development obtained (SBET > 1200 m2 g?1), they subsequently functionalized nitrogen groups mild conditions. As-synthesized also heat-treated enhance electrical conductivity, improving electrochemical performance. As proof concept, capacitors (ECs) based on as-prepared aqueous organic electrolytes, showing densities comparable those capacitor an AC used commercial capacitors. The most attractive outcome study straightforward, cost-effective, sustainable methodology prepare added-value functional great potential for environmental applications.