Two Food Wastes, One Furnace Step — a Supercapacitor Electrode From Coffee and Oranges
One-step co-pyrolysis of spent coffee grounds and orange peels yields a hierarchical porous carbon that reaches 275.3 F/g at 1 A/g — orange peel acts as a natural activator, with micro-Raman D/G analysis on the MRID linking structure to performance.