Nguyen, Dinh Cung Tien Kim, Seonghan Kim, Bo-Seok Kim, Sejung Lee, Soo-Hyoung 2025-03-22T14:30:04Z 2025-03-22T14:30:04Z 2025-03-19 2025-07 1005-0302 https://pubs.kist.re.kr/handle/201004/152018 Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is a highly successful conductive polymer utilized as an electrode material in energy storage units for portable and wearable electronic devices. Nevertheless, employing PEDOT:PSS in supercapacitors (SC) in its pristine state presents challenges due to its suboptimal electrochemical performance and operational instability. To surmount these limitations, PEDOT:PSS has been integrated with carbon-based materials to form flexible electrodes, which exhibit physical and chemical stability during SC operation. We developed a streamlined fabrication process for high-performance SC electrodes composed of PEDOT:PSS and carbon quantum dots (CQDs). The CQDs were synthesized under microwave irradiation, yielding green- and red-light emissions. Through optimizing the ratios of CQDs to PEDOT:PSS, the SC electrodes were prepared using a spray-coating technique, marking a significant improvement in device performance with a high volumetric capacitance (104.10 F cm(-3)), impressive energy density (19.68 Wh cm(-3)), and excellent cyclic stability, retaining similar to 85 % of its original volumetric capacitance after 15,000 repeated GCD cycles. Moreover, the SCs, when utilized as a flexible substrate, demonstrated the ability to maintain up to similar to 85 % of their electrochemical performance even after 3,000 bending cycles (at a bending angle of 60 degrees). These attributes render this hybrid composite an ideal candidate for a lightweight smart energy storage component in portable and wearable electronic technologies.(c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. English Chinese Society of Metals High volumetric-energy-density flexible supercapacitors based on PEDOT:PSS incorporated with carbon quantum dots hybrid electrodes Article 10.1016/j.jmst.2024.08.073 1 Journal of Materials Science & Technology, v.223, pp.1 - 10 Journal of Materials Science & Technology 223 1 10 N scie scopus 001399976700001 2-s2.0-85212591626 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article PERFORMANCE STATE COMPOSITE PEDOT:PSS Carbon quantum dots Hybrid electrode Supercapacitor Flexible power sources