Browsing by Author "Akinay, Y."

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Ceramic-Based Functional Electrode Materials for Application in Solid Oxide Cell-Based Electrochemical Devices
(Elsevier, 2023) Dey, S.; Bose, D.; Akinay, Y.; Mukhopadhyay, M.; Sharma, A.D.; Mukhopadhyay, J.
In the context of the hydrogen conversion and generation, solid oxide cell (SOC)-based technology is quite promising which can function in the reversible way, viz. solid oxide fuel cell (SOFC) to produce power by oxidation of fuel (hydrogen/NG/STP biogas, etc.) and solid oxide electrolyzer cell (SOEC) to generate hydrogen by splitting of water at high temperature. Nanocrystalline La/Ba1−xSrxCoyFe1−yO3(LSCF or BSCF)-based air electrode materials for SOC have been synthesized by solution combustion method. Such air electrodes having extended triple-phase boundary facilitate the bulk oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) for application in SOFC and SOEC, respectively. The functionality of the air electrode is further reported in the context of the morphologically engineered conventional air electrode. As a characteristic SOFC performance, 1.2Acm−2 current density @ 700°C at 0.5V potential for a cell configuration of Ni-YSZ/YSZ/CGO/CGO-LSCF/LSCF is reported where no secondary insulating phases are obtained at the interfaces where H2 is used as the fuel and O2 as the oxidant. For such MIEC air electrode systems, current densities of 0.71 and 1.4Acm−2 are observed at @ 800°C and 1.3V in SOEC mode with 0.58NLcm−2h−1 and 0.30NLcm−2h−1 rate of hydrogen generation, respectively. A maximum of 0.57NLcm−2h−1 hydrogen flux is obtained at an operating temperature of 800°C which is equivalent to ∼1Nm3h−1kW−1 stack with footprint area of 80cm2. Irrespective of operating temperature, BSCF exhibits higher hydrogen flux and may be correlated to the intrinsically higher charge transfer reaction for OER. The authors also intend to fabricate SOC with functional Ni/Cu@YSZ anode with unique core-shell structure. Efficacy of such anode is studied toward the oxidation of fuels with a current density @2.5 and @1.13Acm−2 (with hydrogen and methane), respectively. Finally, for optimizing the air electrode formulation, the authors used “ab initio” first principle to determine the density of states and are analyzed in terms of linear combination of atomic orbital (LACO) theory. Detailed discussion of material aspect of electrodes for SOC, synthesis, functionalization, and application is also discussed in detail along with the breaches which can be undertaken for future research in this arena. © 2023 Elsevier Ltd. All rights reserved.
Cu(II)-Aminotetrazole Complex Anchored on SBA-15: A High-Performance Catalyst for the Synthesis of 1,4-Disubstituted
(Springer, 2025) Taghavi, N.; Mansoori, Y.; Fekri, S.; Akinay, Y.; Cetin, T.
This research focuses on developing and thoroughly analyzing a copper catalyst anchored to SBA-15. The catalyst was prepared via stepwise functionalization of SBA-15, involving successive treatments with (3-aminopropyl)triethoxysilane (APTES), trichlorotriazine, and 5-aminotetrazole to form SBA@bis(ATET). Coordination with Cu(OAc)2 in acetonitrile yielded the final complex, SBA@bis(ATET)-Cu(II). Characterization techniques included FT-IR, Brunauer-Emmett-Teller (BET) surface analysis, cross-polarization/magic angle spinning 13C NMR (CP/MAS 13C NMR), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Catalytic studies demonstrated that SBA@bis(ATET)-Cu(II) efficiently catalyzed the synthesis of 1,4-disubstituted-1,2,3-triazoles through the reaction of acetylenes, benzyl or alkyl halides, and sodium azide, achieving excellent yields under optimized conditions. The catalyst exhibited excellent recyclability, maintaining activity over five cycles with minimal deactivation and low copper leaching (1.25%) in the first cycle, highlighting its robustness and sustainability for organic synthesis applications. © 2025 Elsevier B.V., All rights reserved.
Oxygen Vacancy-Rich Ceo2 Decorated With Cu3bis3 Nanoparticles: Outstanding Visible-Light Photocatalytic Performance Towards Tetracycline Degradation
(Elsevier Ltd, 2023) Habibi, M.; Habibi-Yangjeh, A.; Akinay, Y.; Khataee, A.
Recently, the degradation of antibiotics has attracted a lot of attention all over the world, because the accumulation of these recalcitrant compounds in the environment, and their entry into the food chain have severely affected on human health. Herein, oxygen vacancy-rich CeO2 was decorated with Cu3BiS3 nanoparticles to fabricate Z-scheme CeO2-x/Cu3BiS3 photocatalysts with a simple procedure. Intriguingly, photocatalytic ability of CeO2-x/Cu3BiS3 (30%) nanocomposite in the detoxification of tetracycline hydrochloride, cephalexin, azithromycin, and rhodamine B was elevated 31.3, 28.2, 45.2, and 10.1-folds as much as CeO2, and 5.19, 5.97, 32.2, and 4.69-folds compared with the CeO2-x photocatalyst, respectively. The admirable activity of CeO2-x/Cu3BiS3 (30%) nanocomposite was ascribed to the production of many charge carriers, efficacious segregation and transfer of charges, and improved textural features, which were confirmed by UV–vis DRS, EIS, photocurrent density, PL, and BET analyses. In addition, the TC degradation pathway was investigated with LC-MS analysis, and also the biocompatibility of the purified solution was displayed with wheat seed cultivation. Regarding outstanding activity and facile synthesis, the CeO2-x/Cu3BiS3 (30%) photocatalyst could be utilized for wastewater treatment. © 2023 Elsevier Ltd
Scope and Challenges for Green Synthesis of Functional Nanoparticles
(CRC Press, 2022) Chatterjee, R.; Sarkar, S.; Dutta, A.K.; Akinay, Y.; Dasgupta, S.; Mukhopadhyay, M.
Synthesis and Dielectric Properties of Magnesium Silicate Hydrate Deposited With Sno2
(Sakarya University, 2020) Akinay, Y.
In this study, the dielectric properties of SnO2 coated Magnesium Silicate Hydrate (MSH) pigments were evaluated. The SnO2 coated MSH pigments were obtained by chemical reduction method with the 3:7 SnO2/MSH ratio by weight. The structural and dielectric properties of this pigment and MSH were investigated. The surface morphology and phase types were determined by scanning electron microscope (SEM) and x-ray diffraction (XRD). The bond types were characterized by Fourier Transform Infrared Spectrophotometer (FT-IR). The surface of MSH was uniformly coated with SnO2 as accepted in the SEM images. The existence of XRD peaks for SnO2 nanoparticles proves the presence of SnO2 coating. The dielectric properties of prepared pigments were measured via vector network analyzer (VNA) in the frequency range of 8.2–12.4 GHz (X-Band). The dielectric properties of SnO2 deposited MSH pigments were obtained to be about almost 3-4 times than MSH in the 8-12 GHz frequency range. This study is the first report for the dielectric properties of SnO2 deposited MSH pigments. © 2020, Sakarya University. All rights reserved.