Enhanced electrochemical performance of flexible carbon substrates via carbonized layer of oxidant-induced polydopamine for high-performance supercapacitors

초록

Flexible substrates are essential for advancing energy storage materials in portable and wearable devices. Carboncloth is a promising option due to its flexibility and lightweight properties, but its high electrical resistance andhydrophobic surface present challenges for solution-based electrolytes. To overcome these issues, a surfacemodification technique was developed that coats carbon cloth with dopamine and subsequently carbonizes it. This process enhances hydrophilicity while preserving the sp2 carbon structure, significantly improving electricalconductivity. The chemical bath deposition of Ni(OH)2 onto the carbonized polydopamine-coated carbon clothproduced a uniform layer that increased specific capacitance dramatically. At a current density of 1 A/g, thespecific capacitance reached 1100F/g, compared to 919F/g for Ni(OH)2 on unmodified carbon cloth. Furthermore,the electrodes maintained high specific capacitance at higher current densities, showcasing superior ratecapability. Overall, carbonized polydopamine layers effectively reduce electrical resistivity and hydrophobicity,enhancing the performance of carbon-based materials for energy storage applications.

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