Hybrid flexible electrodes are attracting increasing attention for their potential use in next-generation energy storage devices. In this work, copper electrodes were fabricated directly on polyimide substrates using a laser-assisted metallization technique and subsequently modified with cobalt hexacyanoferrate (CoHCF) nanocrystals via the successive ionic layer adsorption and reaction (SILAR) method. SEM analysis revealed the formation of cubic CoHCF particles, which aggregated into fused structures with exposed tetrahedral-like features, increasing the roughness and effective surface area of the electrode. The CoHCF/Cu electrode exhibited a specific capacitance of 216.5 mF/cm2 at 0.25 mA/cm2. Cycling stability tests revealed good reversibility and structural integrity. These results highlight the potential of laser-fabricated and SILAR-modified CoHCF/Cu electrodes as promising candidates for application in flexible supercapacitors.
Kaneva et al. (2026) studied this question.