High-specific-capacitance electrolytic capacitors based on anodic TiO2 nanotube arrays

Yu, Yuantian; Li, Chengyuan; Wang, Heng; Chen, Jieda; Zhu, Xufei; Zhang, Ying; Song, Ye

doi:10.1016/j.electacta.2022.140974

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…2 This can be realized simply by optimizing the anodization parameters including the applied voltage, anodization temperature, water content in the electrolyte, and fluorine ion concentration. 3 Compared to TNT grown on the opaque Ti foil 4 or Ti alloys, 5 semitransparent materials made of TCOs overgrown with TNT have multiple advantages. First, the opaque metal foil that serves as a substrate for TNT limits their potential applications, especially in PEC and optoelectrochemical devices (e.g., dye-sensitized solar cells or electrochromic devices) requiring semitransparent electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to TNT grown on the opaque Ti foil or Ti alloys, semitransparent materials made of TCOs overgrown with TNT have multiple advantages. First, the opaque metal foil that serves as a substrate for TNT limits their potential applications, especially in PEC and optoelectrochemical devices (e.g., dye-sensitized solar cells or electrochromic devices) requiring semitransparent electrodes. , In fact, materials exhibiting semitransparency allow the light to pass through the entire cell, thus increasing the number of photogenerated electron–hole pairs compared to the nontransparent substrate .…”

Section: Introductionmentioning

confidence: 99%

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Photoelectrochemical and Electrochemical Activity of Anodic Semitransparent Aligned and Spaced Titania Nanotubes Formed out of Titanium–Silver Alloys

Kouao,

Hanuš,

Kylián

et al. 2024

ACS Appl. Nano Mater.

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Two titania nanotube (TNT) architectures, namely, aligned and spaced, have been synthesized by anodizing titanium−silver (TiAg) alloy films (i.e., 1.7, 3.5, and 5% Ag content) sputtered onto indium−tin oxide. The Raman spectra showed that the anatase phase is obtained for the aligned TNT up to 5% Ag content, whereas no anatase peak is observed for the spaced TNT above 1.7% Ag content in the deposited TiAg alloys. The electrochemical studies carried out in the presence of redox species showed that, among others for 5% Ag content in the deposited TiAg alloy used for anodization, a reversible redox reaction of ferricyanide species occurs that was not found for bare TNT. Moreover, irrespective of the titania arrangement, an increase of the Ag content in the TiAg films to 5% leads to a very efficient electron-transfer rate of 3.84 × 10 −3 cm s −1 for aligned and 7.98 × 10 −3 cm s −1 for spaced titania. In addition, the photoelectrode based on aligned TNT grown out of the TiAg alloy films containing 3.5% Ag exhibited a photocurrent density of about 3 times higher with respect to the aligned TNT obtained from the pure titanium film.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical and Electrochemical Activity of Anodic Semitransparent Aligned and Spaced Titania Nanotubes Formed out of Titanium–Silver Alloys

Kouao,

Hanuš,

Kylián

et al. 2024

ACS Appl. Nano Mater.

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“…For instance, some capacitors utilize dielectric materials such as oil-impregnated paper [17], mineral oil [18], or nonlinear dielectric materials [19,20]. Another category includes electrolytic capacitors, where both the electrodes and the dielectric material are produced using nanotechnology processes [21,22]. These capacitors are specifically designed for storing electrical energy [23].…”

Section: Introductionmentioning

confidence: 99%

Electric Capacitors Based on Silicone Oil and Iron Oxide Microfibres: Effects of the Magnetic Field on the Electrical Susceptance and Conductance

Bica,

Anitas,

Iacobescu

2024

Preprint

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This paper presents the fabrication and characterization of cylindrical capacitors utilizing magnetodielectric materials composed of magnetizable microfibers dispersed within a silicone oil matrix. The microfibers, ranging in diameter from 0.25 to 2.20 μm, comprise hematite (α-Fe2O3), maghemite (γ-Fe2O3), and magnetite (Fe3O4). The study investigates the electrical behavior of these capacitors under the influence of an external magnetic field superimposed on a medium-frequency alternating electric field, across four distinct volume concentrations of microfibers. Electrical capacitance and resistance measurements are conducted every second over a 60-second interval, revealing significant dependencies on both the quantity of magnetizable phase and the applied magnetic flux density. Furthermore, the temporal stability of the capacitors’ characteristics is demonstrated. The obtained data are analyzed to determine the electrical conductance and susceptance of the capacitors, elucidating their sensitivity to variations in microfiber concentration and magnetic field strength. To provide theoretical insight into the observed phenomena, a model based on dipolar approximations is proposed. This model effectively explains the underlying physical mechanisms governing the electrical properties of the capacitors. These findings offer valuable insights into the design and optimization of magnetodielectric-based capacitors for diverse applications in microelectronics and sensor technologies.

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“…Once this voltage threshold is surpassed, electrical breakdown of the oxide film occurs, leading to the failure of the capacitors. [8][9][10] For determining the sparking voltage of an electrolyte, it is highly desirable to develop reliable and reproducible test methods.…”

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confidence: 99%

Determining the Sparking Voltage of Working Electrolytes

Wang,

Yuan

et al. 2023

J. Electrochem. Soc.

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Sparking voltage is a vital parameter of the working electrolytes for aluminum electrolytic capacitors, which determines the operating voltage of the capacitors. However, the existing methods for measuring the sparking voltage suffer from low accuracy, bad reproducibility, high artificial error, etc. Here, we report a versatile approach for determining the sparking voltage of the electrolytes. By a linear fitting procedure, the voltage-time data acquired from the test experiments were transformed into a correlation coefficient-time curve. Because the abrupt correlation coefficient change due to the occurrence of sparking could be more readily identified in the correlation coefficient-time curve, the limit voltage of the electrolyte was accurately determined. Thus, this voltage was subtracted from the infrared drop in the solution to get the true sparking voltage of the electrolyte. This method prevented artificial errors arising from the direct observation or listening of sparking features, by which reliable and reproducible results can be gained by a computer program. This study provides an active support for the development of high-performance working electrolytes.

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High-specific-capacitance electrolytic capacitors based on anodic TiO2 nanotube arrays

Cited by 9 publications

References 30 publications

Photoelectrochemical and Electrochemical Activity of Anodic Semitransparent Aligned and Spaced Titania Nanotubes Formed out of Titanium–Silver Alloys

Photoelectrochemical and Electrochemical Activity of Anodic Semitransparent Aligned and Spaced Titania Nanotubes Formed out of Titanium–Silver Alloys

Electric Capacitors Based on Silicone Oil and Iron Oxide Microfibres: Effects of the Magnetic Field on the Electrical Susceptance and Conductance

Determining the Sparking Voltage of Working Electrolytes

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