Yazar "Jockusch, Steffen" seçeneğine göre listele

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    Öğe
    From Plant Oils to High-Performance Supercapacitor Electrode: Poly(guaiazulene) via Photopolymerization
    (Wiley, 2025) Ermiş, Sena; Altınışık, Sinem; Çatoğlu, Fahri; Yağcı, Yusuf; Sarı, Erdem; Jockusch, Steffen; Koyuncu, Sermet
    Due to the increasing global demand for electrical energy, the fabrication of advanced energy storage devices, such as supercapacitors (SCs), with outstanding performance is of paramount importance. Herein, the facile light-induced synthesis of a conjugated conductive polymer, namely, poly(guaiazulene) (PGz) is reported on, using a naturally available, low-cost monomer, guaiazulene (Gz). PGz and PGz_rGO (obtained by combining PGz with reduced graphene oxide (rGO)) exhibited high-performance supercapacitor (SC) electrode properties, including remarkable specific capacitance (52.75 F g-1 at 0.24 A g-1 and 258.6 F g-1 at 5.00 A g-1, respectively), excellent cycling stability (97.1% and 94.0% stability after 5000 cycles), high power density (95.5 and 2118.8 W kg-1), and, most importantly, high energy density (5.81 and 30.57 Wh kg-1). These superior features are attributed to the hierarchical porous nature and high electrical/ionic conductivities of the photochemically obtained PGz. Contrary to previous techniques that require harsh reaction conditions, such as carbonization and coupling reactions, the reported photopolymerization involves solely the irradiation of an ethyl acetate solution of a Gz-organic photoinitiator (2-bromoacetophenone) mixture. The photochemical synthesis described here provides a powerful method to produce a sustainable and high-performance SC electrode material, offering a great alternative to commercial SCs. Light-induced synthesis of a conjugated conductive polymer, namely, poly(guaiazulene) (PGz) possessing superior supercapacitor electrode performance is achieved by a sustainable method involving solely the UV-A irradiation of ethyl acetate solution of guaiazulene (a naturally occurring monomer) and an organic photoinitiator, phenacyl bromide. The reported method offers a sustainable alternative to commercial carbon-based supercapacitors. image
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    Öğe
    Photopolymerized PEDOT-coated polydopamine: A Green approach for supercapacitor electrode materials
    (Elsevier, 2025) Ermis, Sena; Tohtayeva, Jahan; Altinisik, Sinem; Ulucay, Sude; Jockusch, Steffen; Kiskan, Baris; Koyuncu, Sermet
    Conjugated conductive polymers (CCPs) are promising electrode materials for next-generation supercapacitors (SCs), yet their scalable and eco-friendly synthesis remains a challenge. Here, we report a light-driven, in-situ polymerization of EDOT onto polydopamine (PDA@PEDOT), offering a sustainable, photoinitiated route for high-performance SC electrodes. Using an organic, environmentally safe photoinitiator and ethanol as a green solvent, this method achieves uniform PEDOT deposition on PDA with minimal energy input. Using a three-electrode method, the resulting PDA@PEDOT electrode exhibits exceptional electrochemical performance, including a high specific capacitance of 275 F g-1 at 1.0 A g-1, an energy density of 34.04 W h kg-1, and excellent adhesion properties. The synergistic non-covalent interactions between PDA's amine, catechol, quinone functionalities and PEDOT are credited to enhance ion transport through the electrode, improving SC efficiency. These exceptional properties, alongside strong adhesion and uniform deposition of PEDOT on PDA, demonstrate the novelty of the advanced photopolymerization approach. Our eco-friendly photopolymerization method paves the way for sustainable, high-performance SC electrode fabrication, bridging the gap between sustainable chemistry and next-generation energy storage.