Yazar "Gecgel, Cihan" seçeneğine göre listele

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    Öğe
    Fabrication of LaFeO3/g-C3N4@reduced graphene oxide 3-dimensional nanostructure supercapacitor
    (Springer, 2022) Harputlu, Ersan; Gecgel, Cihan
    This paper describes the electrochemical studies of a magnificent new ternary complex whose nanoarchitecture consists of lanthanum iron oxide (LaFeO3) perovskite, graphitic carbon nitride (g-C3N4), and reduced graphene-based hydrogel (GH) for the supercapacitor (SC) approach. For this purpose, GH was used as the backbone structure in the main body of the hybrid structure. A hybrid form of g-C3N4 and GH was used in the appropriate architecture required to improve the usage area of LaFeO3 perovskite structure in supercapacitor applications. Thus, by increasing the interaction surface area between the electrode-electrolyte of the supercapacitor made with LaFeO3, the specific capacitance amount and long cycle life of the SC were increased. Within this context, the advanced three-dimensional (3D) LaFeO3/g-C3N4@GH hydrogel is created by using basic hydrothermal and freeze-drying processes. Electrochemical investigations revealed that LaFeO3/g-C3N4@GH has improved capacitive performance, with a specific capacitance (C-s) of 652.12 F/g at a scan rate of 5 mV/s. These results displayed the simple production strategy of 3D GH-based hybrid hydrogel for high-performance SC.
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    Öğe
    Solar-light-driven photocatalytic hydrogen evolution by push-pull thiophenoxy-substituted zinc phthalocyanines
    (World Scientific Publ Co Pte Ltd, 2023) Acar, Eminegul Genc; Ince, Tuncay; Yuzer, A. Celil; Yanalak, Gizem; Gecgel, Cihan; Aslan, Emre; Ince, Mine
    Two zinc phthalocyanine derivatives (ZnPc 1 and 2) carrying bulky 2,6-diisopropylthiophenoxy peripheral substituents have been synthesized and their performances as photosensitizers in photochemical hydrogen production evaluated. To examine the influence of the spacer on the performance of ZnPc 1 and 2, the carboxyl group has been linked to the macrocycle ring either directly or via the phenyl ring, respectively. The photocatalytic activities of ZnPcs (ZnPc 1 and ZnPc 2) as sensitizers of TiO(2 )for hydrogen production were investigated in the presence of Pt. ZnPc 1 and ZnPc 2 sensitized TiO(2 )produced 0.687 mmolg(-1)h(-1) and 0.436 mmol g(-1)h(-1) hydrogens, which also reached 3.986 and 2.091 mmolg(-1) after 8h illumination, respectively, under visible light (>= 420 nm) irradiation. In addition, STH efficiencies of ZnPc 1/TiO2 and ZnPc 2/TiO2 were determined as 1.77% and 1.12%, respectively. ZnPc 1/TiO2 exhibited 1.9-fold more photocatalytic hydrogen amount than ZnPc 2/TiO2, and the hydrogen evolution performance of the photocatalyst in the presence of Pt enhanced to 3.021 mmol g(-1)h(-1) and 0.911mmol g(-1)h(-1) for ZnPc 1 and ZnPc 2, respectively.