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Integrated photocapacitors based on dye-sensitized TiO <sub/>2</sub> /FTO as photoanode and MnO <sub/>2</sub> coated micro-array CNTs as supercapacitor counter electrode with TEABF4 electrolyte
摘要： Harvesting solar energy using dye-sensitized solar cells (DSSCs) has been a promising option. Successful integration of a DSSC electrode with an energy storage electrode represents the next challenge for the researchers. In this paper, the fabrication and characterization of an integrated dye-sensitized photoanode and a supercapacitor cathode or a photocapacitor has been presented. This novel device employs N-719 dye-sensitized titanium dioxide on fluorine-doped tin oxide glass substrate as the photoanode. The supercapacitive counter electrode comprises MnO2 coated, vertically aligned, micro-array patterned carbon nanotubes (MA-CNTs). The CNTs were grown on n++ silicon (Si) substrates in a hot filament chemical vapor deposition system followed by in-situ electrochemical deposition of MnO2. Tetraethyl ammonium tetrafluoroborate electrolyte was used to investigate the photovoltaic and energy storage performances of the photocapacitors under 1-sun illumination and constant-current discharge tests. A high discharge capacitance of 13 mF/cm2 at 0.932 V was achieved by coating MnO2 onto the high surface area of MA-CNTs due to the pseudocapacitive behavior of MnO2, which led to a nearly 3-fold increase in the short circuit current density to 0.749 mA/cm2 and more than a 2-fold enhancement in the open circuit voltage to 0.46 V, as compared to the baseline CNT counter electrode. The corresponding increase in the fill factor and efficiency was also observed. Overall, we have demonstrated the viability of a compact, easy to fabricate, integrated photocapacitor with promising energy generation/storage performance.
关键词： photocapacitor,dye-sensitized solar cells,MnO2,energy storage,carbon nanotubes
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Austin, TX, USA (2018.9.24-2018.9.26)] 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - A Compact Model of Drift and Diffusion Memristor Applied in Neuron Circuits Design
摘要： A compact model of memristor for unifying two switch characteristics, drift and diffusion has been proposed, based on the ion dynamic transport theory at the oxide interface layer. The model is verified by measured data in different oxide-material-based drift/diffusion memristors, and well fits DC/AC characteristics of both devices, under parameter variations and temperature evolution. Moreover, the applications of this model in neuron circuits design are shown.
关键词： adsorption effect,boron nitride nanotubes,first-principles calculations,small molecule
更新于2025-09-09 09:28:46
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Gold nanotubes and nanorings: promising candidates for multidisciplinary fields
摘要： Gold is considered as an inert metal and ranks as one of the noblest among all the metals. Progressive importance associated with nanotechnology offers potential development of new methods and controlled morphologies of the anisotropic gold nanostructures to develop its innovative properties and commensurate applications. The unique gold nanostructures are considered for their potential applications in various fields due to their large surface area, excellent adhesion properties and resistance to corrosion. In this review, we will present recent developments for gold nanorings and nanotubes, under the headings of synthesis, properties and potential applications in various fields.
关键词： Gold nanotubes,gold nanorings,applications of gold nanotubes and gold nanorings
更新于2025-09-04 15:30:14
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Effect of Anodization Parameters on the Surface Morphology and Photoelectrochemical Properties of TiO2 Nanotubes
摘要： Titanium sheets are anodized to prepare titanium dioxide nanotubes (TiO2 NTs) with varying chemical polishing times, anodizing voltages, anodizing times and NH4F electrolyte concentrations. The surface morphology of the TiO2 NTs is observed by a Scanning Electron Microscope (SEM) and used to characterize the inner diameter (di), centre to centre distance (l) and wall thickness (w). The photoelectrochemical performance of TiO2 NT arrays is described by measurements of the photocurrent density and the incident photon to current efficiency (IPCE). The data show l can be controlled by the anodizing voltage; in contrast, di and w are influenced by the anodizing time and NH4F electrolyte concentration. Furthermore, the effects of the anodization parameters on the TiO2 NTs’ surface morphology were determined to influence each other. Using the optimum condition of an anodizing voltage of 60 V at 60 min in 0.125 mass % NH4F ethylene glycol, TiO2 NTs were fabricated that showed a photocurrent density of 90.42 μA /cm2 and maximum IPCE of 18.76 % at 300 nm. The results indicate that the effects of the anodization parameters on the photocurrent response of TiO2 NTs are primarily achieved through control of the wall thickness and the ratio of the diameter to the wall thickness (di / w). For a wall thickness that is greater than a critical value, the ratio di / w can reach a range in which the TiO2 NTs show a high photocurrent output.
关键词： surface morphology,wall thickness,TiO2 nanotubes,anodization,photoelectrochemical property
更新于2025-09-04 15:30:14
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Microstructure and Electrochemical Behavior of TiO <sub/>2</sub> Nanotubes Coated on Titanium-Based Substrate Before and After Thermal Treatment
摘要： The comparative study of the structure and electrochemical properties of TiO2 layers on the surfaces of commercially pure titanium and Ti6Al4V alloy were performed. The TiO2 surface layers produced by anodization in ethylene glycol-based electrolyte solution using Power Supply MCS-3204 MANSON at 20 V or 40 V for 60 minutes were formed on the titanium substrates by simultaneous surface oxidation and controlled dissolving of oxide film due the fluorine ions. The SEM and X-ray diffraction analyses were performed to determine the properties of the anodized layers before and after heat treatment at 500 °C for 120 minutes. The as-anodized TiO2 nanotubes exhibited an amorphous structure. An anatase phase appeared in annealed nanotube layers of both Ti based substrates. The corrosion behavior in simulated physiological solution was compared for not anodized, anodized and anodized heat treated conditions of both titanium surfaces. The results of the electrochemical measurements corresponded to the microstructure and treatment condition. The porous feature of the anodizing layers on Ti6Al4V substrate led to lower corrosion resistance that increased after the heat treatment.
关键词： TiO2 Nanotubes,XRD,Titanium Alloy,Anodization,Microstructure
更新于2025-09-04 15:30:14
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Measuring nanoparticles in the size range to 2000?nm
摘要： Measurement of light scattered from suspensions of monodisperse nanoparticles in solution (Bturbidity^) long has been used to derive their size. Following some means of fractionation, the light (monochromatic) scattered by the particles into a set of distinct angles is collected and a non-linear least squares fit was made to an appropriate theory in order to extract their size. For a wide range of particle structures, where this process becomes very complex and of questionable validity, there is a far simpler interpretive means based upon measurements at extremely small, and often inaccessible, scattering angles. A method is described whereby the required small angle values are derived from measurements made over a range of larger, more readily accessible, angles. Although the basis for the analyses developed is the Rayleigh-Gans approximation, the results presented confirm that the method provides meaningful results up to a size of about 2000 nm. The larger sizes are well beyond the RG limits.
关键词： Gold,Aggregates,Particle suspensions,Rods,Spheres,Carbon nanotubes
更新于2025-09-04 15:30:14
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Recent advances in synthesis, properties, and applications of vanadium oxide nanotube
摘要： Vanadium oxide nanotube is a new type of nanotubular material which opens new horizons for application in many areas. The important catalytic and electrochemical property of vanadium oxide as well as the unique shape of the nanotubes has been the impetus for studying this novel type of nanostructured material. The paper review focuses on recent advances of synthesis vanadium oxide nanotubes. Methods of synthesis vanadium oxide nanotubes (sol-gel, hydrothermal) of nanostructured-based on electrochemical and catalytic processes and metal dichalcogenides, Inorganic nanotubes, and oxide and hydroxide nanotubes and details the synthesis and structural properties of vanadium oxides get are reviewed.
关键词： Catalytic,Vanadium oxide,Sol-gel,Hydrothermal synthesis,Inorganic nanotubes,Nanostructured
更新于2025-09-04 15:30:14
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Synthesis, characterization and photocatalytic activity of boron-doped titanium dioxide nanotubes
摘要： Two-step hydrothermal method was used to prepare undoped and boron-doped one-dimensional titanium dioxide (TiO2) nanotubes. Structural properties, thermal stability and microstructural features of the fabricated undoped titanium dioxide nanotubes (TNTs) and boron-doped titanium dioxide nanotubes (BTNTs) were characterized by Xeray diffraction, Raman, Fourieretransform infrared spectroscopy, nitrogen adsorption-desorption isotherms, scanning and transmission electron microscopy techniques. The photocatalytic activity of the fabricated nanotubes was evaluated by using methylene blue degradation. Boron addition to the titanium dioxide nanotubes up to 5% increased the photocatalytic methylene blue degradation ef?ciency. The achieved highest degradation ef?ciency was 81% and it was determined that higher (>5%) boron doped into the titanium dioxide nanotubes resulted in a decreased degradation ef?ciency.
关键词： Titanium dioxide nanotubes,Photocatalyst,Boron,Hydrothermal synthesis,Spectroscopy
更新于2025-09-04 15:30:14
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Carbon Nanotubes-Wrapped Urchin-Like Bi <sub/>2</sub> S <sub/>3</sub> Composites with Enhanced Photocatalytic Performance
摘要： The urchin-like Bi2S3/carbon nanotubes (Bi2S3 urchin/CNTs) composites were successfully synthesized by a microwave method. X-ray diffraction (XRD), Fourier Transform infrared spectra (FTIR), Raman spectra, diffused reflectance spectra (DRS) were used for the characterization of the obtained photocatalysts. The SEM and TEM morphology of Bi2S3 urchin/CNTs composites showed that urchin-like nanoparticles were assembled by many nanorods which grew radially from the center and nanorods were wrapped with CNTs on their end. The photocatalytic performance was studied by the degradation of methyl orange (MO) under visible light and the photodegradation efficiency of Bi2S3 urchin/CNTs hybrid materials exhibited significantly excellent photocatalytic activity. A possible mechanism for the photodegradation of MO was also suggested.
关键词： Photocatalysts.,Carbon Nanotubes
更新于2025-09-04 15:30:14
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Hole-induced polymerized interfacial film of polythiophene as co-sensitizer and back-electron injection barrier layer in dye-sensitized TiO2 nanotube array
摘要： In this work, we demonstrate that an ultra-thin film of polythiophene deposited interfacially via hole-induced polymerization on the surface of dye-sensitized TiO2 nanotube array acts as co-sensitizer, and hinders back-electron transfer in a DSSC. Consequently, the dark current, and the recombination reactions can be suppressed, leading to an improved number of electron density at the TiO2 array electrode. Thus, an enhanced photocurrent, and power conversion efficiency of the device is achieved. This logical concept is experimentally justified, and the device, after polythiophene interfacial treatment, demonstrates an enhanced power conversion efficiency by the factor of 39.19%.
关键词： Interfacial treatment,Back-electron injection barrier,Hole-induced polymerization,TiO2 nanotubes,Polythiophene co-sensitizer,DSSC
更新于2025-09-04 15:30:14