ABSTRACT Activated carbon derived from cocoa pod husk was engineered for solid‐state energy storage applications through controlled KOH activation. The effects of KOH concentration and immersion duration were systematically evaluated to optimize pore development and electrochemical behavior. Carbonization at 500°C followed by activation at 700°C significantly enhanced textural characteristics, leading to a maximum surface area of 431.73 m 2 g −1 and average pore radius of 1.759 nm at 12 h immersion. Electrochemical measurements using a PVA–K 2 CO 3 gel electrolyte demonstrated improved charge storage performance, particularly for carbon activated with 5 M KOH for 12 h. The results confirm that optimized alkaline activation creates a hierarchically porous and conductive carbon network capable of efficient ion transport and charge accumulation. This work highlights cocoa pod husk as a promising and sustainable precursor for high‐performance solid‐state energy storage electrodes.
Pratama et al. (Fri,) studied this question.