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- Conference ObjectYalnız künye2019Two Dimensional Ti3C2Tx MXene Electrode For Supercapacitor Application
Tuzluca, Fatma Nur; Yesilbag, Yasar Ozkan; Shafiee, Farah Nabilah; Hamidon, Mohd Nizar; Ertugrul, Mehmet
Two-dimensional materials are one of the most studied materials for many applications in recent years. Among the two-dimensional (2D) metal carbide, MXene is seen as one of the most promising materials for energy storage systems. Among the MXene family, Ti3C2Tx, the lightest material, is one of the electrode materials due to its unique electrochemical performance. In this study, Ti3C2Tx MXene structure was obtained by removing Al layer from Ti3AlC2 MAX structure by selective etching. Exceptional electrochemical performance and high electronic conductivity of Ti3C2Tx was obtained and surface and morphological analyzes were performed with FESEM, EDS, XRD. FESEM has demonstrated that synthesized MXene is a layered solid structure. In addition, synthesized MXene was tested for electrochemical behavior against electrochemical energy storage applications using techniques such as cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS). Characterization and electrochemical tests have shown promising performance in electrochemical charge storage applications.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2018Synthesis of In 2 O 3 nanostructures with different morphologies as potential supercapacitor electrode materials
Tuzluca, Fatma Nur; Yesilbag, Yasar Ozkan; Ertugrul, Mehmet
In this study performed using a chemical vapor deposition (CVD) system, one-dimensional (1-D) single crystal indium oxide (In 2 O 3 ) nanotowers, nanobouqets, nanocones, and nanowires were investigated as a candidate for a supercapacitor electrode material. These nanostructures were grown via Vapor–Liquid–Solid (VLS) and Vapor–Solid (VS) mechanisms according to temperature differences (1000–600 °C). The morphologies, growth mechanisms and crystal structures of these 1-D single crystal In 2 O 3 nanostructures were defined by Field Emission Scanning Electron Microscopy (FESEM), High Resolution Transmission Electron Microscopy (HR-TEM), X-Ray Diffraction (XRD) and Raman Spectroscopy analyses. The elemental analyses of the nanostructures were carried out by energy dispersive X-Ray Spectroscopy (EDS); they gave photoluminescence (PL) spectra with 3.39, 2.65, and 1.95 eV band gap values, corresponding to 365 nm, 467 nm, and 633 wavelengths, respectively. The electrochemical performances of these 1-D single crystal In 2 O 3 nanostructures in an aqueous electrolyte solution (1 M Na 2 SO 4 ) were determined by Cyclic Voltammetry (CV), Galvanostatic Charge Discharge (GCD) and Electrochemical Impedance Spectroscopy (EIS) analyses. According to GCD measurements at 0.04 mA cm −2 current density, areal capacitance values were 10.1 mF cm −2 and 6.7 mF cm −2 for nanotowers, 12.5 mF cm −2 for nanobouquets, 4.9 mF cm −2 for nanocones, and 16.6 mF cm −2 for nanowires. The highest areal capacitance value was observed in In 2 O 3 nanowires, which retained 66.8% of their initial areal capacitance after a 10000 charge-discharge cycle, indicating excellent cycle stability.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2017Effects of graphite on the synthesis of 1-D single crystal In2O3 nanostructures at high temperature
Tuzluca, Fatma Nur; Yesilbag, Yasar Ozkan; Akkus, Tuba; Ertugrul, Mehmet
This study investigated the effects of graphite powder on the growth mechanisms of one-dimensional (1-D) single-crystal indium oxide (In2O3) nanostructures. The study was conducted using a chemical vapor deposition (CVD) method at 1000 °C; In2O3 and graphite powder mixed with In2O3, with a weight ratio of 1:1, were used as the source material, while 2 nm-thick n-type silicon (100), coated with a gold catalyst, was used as a substrate. It was observed that nanostructures grew via a Vapor-Liquid-Solid (VLS) growth mechanism when only In2O3 was used, but grew via both VLS and Vapor-Solid (VS) growth mechanisms when graphite powder was used with the In2O3. The morphology and crystal structures of the nanostructures grown were investigated using X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HR-TEM), Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersion X-Ray Spectroscopy (EDS). At room temperature (RT), all the nanostructures showed photoluminescence (PL) spectra at a wavelength of 367 nm in the UV-emission region and at wavelengths of 470 and 630 nm in the visible region.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2017Investigation of temperature, catalyst thickness and substrate effects in In2O3 nanostructures
Tuzluca, Fatma Nur; Yesilbag, Yasar Ozkan; Ertugrul, Mehmet
This study successfully synthesized In2O3 nanotowers (NTs), nanowires (NWs), nanochains (NChs) and nanocrystals (NCs) on n-type Si(100) and quartz substrates at temperature of 900–1000 °C by using Au catalysts via the Chemical Vapor Deposition (CVD) technique. The analyses of experimental results revealed that In2O3 nanostructures (NSs) grew in different morphologies due to variable parameters, such as temperature, thickness of catalyst and substrate type. This was because these In2O3 NSs were formed by both the Vapor-Liquid-Solid (VLS) and the Vapor-Solid (VS) growth mechanisms. For instance, In2O3 NTs and NChs were formed by the VLS growth mechanism; In2O3 NCs were formed by the VS growth mechanism and In2O3 NWs were formed by both the VLS and VS growth mechanisms. Morphology and crystal structures were identified through X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM), Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray Spectroscopy (EDS). Moreover, photoluminescence (PL) peaks of In2O3 NSs were measured to be 367 nm, 470 nm, and 630 nm at room temperature (RT). These measurement results indicated that structural, morphological, compositional and optical properties of synthesized In2O3 NSs correlated with growth parameters.
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