Al2O3-TiO2 composite oxide films on etched aluminum foil fabricated by electrodeposition and anodization

Bu, Junfu; Sun, Lin; Wu, Qi; Wang, MengYe; Lin, Changjian

doi:10.1007/s11426-011-4377-9

Cited by 12 publications

(4 citation statements)

References 32 publications

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“…The thicker is the Al-Ti composite oxide layer, the higher is the specific capacitance of the anode Al foils. This is because the Al-Ti composite oxide film is substituted for the Al 2 O 3 barrier layer, and this can increase the permittivity of the anodic oxide film [9][10][11][12][13][14][15][16][17][18]. The decrease in the specific capacitance of the specimens coated 8 times might be caused by a decrease in the effective surface area and tunnel diameter as well as an increase in the film thickness.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the Thickness of Al2O3-TiO2 Composite Oxide Films on the Electrical Properties of Anode Al Foils

Lian

Park

2017

KEM

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High-voltage-etched Al foils with TiO2 coating were fabricated via vacuum infiltration. Specimens subjected to different number of coating cycles (n = 0, 1, 2, 4, and 8) were annealed at 550 °C, and subsequently anodized at different voltages (100, 300, and 500 V). The microstructures of the specimens were observed by field emission scanning electron microscopy and field emission transmission electron microscopy. The results showed that uniform TiO2 films (30 nm per coating cycle) were successfully formed on the high-voltage-etched Al foils. Its tunnels showed a dual-layer structure comprising an Al2O3 outer layer and an Al–Ti composite oxide inner layer after anodizing at 500 V. All the TiO2-coated specimens anodized at different voltages could withstand the corresponding voltage. The thicker is the Al–Ti composite oxide layer, the higher is the specific capacitance of the anode Al foils. Compared to the specimens without the TiO2 coating, the increasing ratios of the specific capacitances of the specimens coated 4 times reached the maximum values, which were 60.2%, 34.0%, and 30.2%, when anodized at 100 V, 300 V, and 500 V, respectively. These results suggest that the Al–Ti composite oxide layer is not only effective in enhancing the specific capacitance but also has a significant effect on the properties of the anode Al foils.

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Section: Resultsmentioning

confidence: 99%

“…Various methods for coating TiO 2 films on low-voltage-etched Al foils with shallow tunnels have been utilized, such as sol-gel, electrodeposition, and hydrolysis precipitation [9][10][11][12][13]. We proposed the vacuum infiltration method to fabricate TiO 2 films on high-voltage-etched Al foils with long tunnels in a previous study [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Thickness of Al2O3-TiO2 Composite Oxide Films on the Electrical Properties of Anode Al Foils

Lian

Park

2017

KEM

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“…5 )TiO 3 composite oxide film on tunnel-etched Al foil by the sol-gel coating method and anodization [13]. Lin et al fabricated 20 V TiO 2 -Al 2 O 3 composite oxide films on tunnel-etched Al foil by electrodeposition and anodization [14]. Park et al prepared 400 V ZrO 2 -Al 2 O 3 and Nb 2 O 5 -Al 2 O 3 composite oxide films on flat Al foil by the sol-gel coating method and anodization [15].…”

Section: Introductionmentioning

confidence: 99%

Performance and Properties of a Ti-Al Composite Anodic Oxide Film on AC-Etched Al Foil

Ban,

Luo,

Sun

et al. 2023

Coatings

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AC-etched aluminum foils for an Al electrolytic capacitor were covered with a TiO2 film by a sol–gel coating and then anodized to 25 V in an ammonium adipate solution. The structure, properties, and performance of the anodic oxide films were examined by transmission electron microscopy (TEM), scanning electron microscopy (SEM), electrochemical impedance measurements (EIS), a general digital LCR meter, a TV characteristic tester, and multicycle pulse charging–discharging. It was found that the anodizing of aluminum coated with TiO2 films led to the formation of Al-Ti composite anodic oxide films, which consist of an outer Al-Ti composite oxide layer and an inner Al2O3 layer on the metal substrate. The capacitance (C25V) of the anodic oxide films formed on specimens with a TiO2 coating was about 10% larger than without a TiO2 coating. The specific resistance (Rox) of the Al-Ti composite film measured by EIS was lower than the blank one, accounting for a greater increase in the rise time (Tr) and a slight reduction in the withstand voltage (Vt). After hydration and a multicycle pulse charging–discharging destructive test, the Al-Ti composite anodic oxide film maintained the same good, comprehensive dielectric properties and performance as the blank one, thereby proving to be promising for acting as dielectric layers.

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“…The routine process adopted widely is to increase specific surface area of aluminum foil by etching. Recent researches show that it is another promising approach to boosting the specific capacitance further via introducing titanium oxides into dielectric layer of aluminum electrolytic ca-pacitor after etching the foil [1][2][3][4][5][6][7][8][9][10][11]. It is proposed that the increase in specific capacitance directly depends on the concentration of titanium (Ti) (IV) in dielectric layer because titanium oxides have much higher permittivity than alumina.…”

Section: Introductionmentioning

confidence: 99%

Simple and Rapid Spectrophotometric Determination of Titanium on Etched Aluminum Foils

Du¹,

Li³

et al. 2014

AJAC

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Introduction of titanium oxides with high permittivity on etched aluminum foils' surface has been successfully utilized to increase specific capacitance of anode foils for aluminum electrolytic capacitors. In order to quantify the concentration of titanium (IV) on the etched aluminum foil precisely, a simple and rapid spectrophotometric procedure has been developed. After optimizing a series of variables including absorbance wavelength, concentration of nitric acid, concentration of hydrogen peroxide, nitration time and developing time, analytical precision and accuracy were tested by using standard working solution containing known amount of titanium (IV). The results showed that Lambert-Beer's law was obeyed in the range of 0.01 to 3.00 mmol•L −1. The relative standard deviation (RSD) ranged from 0.67% to 1.09% (n = 6), and the recovery was between 99.17%-100.03%. Investigation on effect of Al 3+ ion indicated that there was no interference in the absorbance of titanium (IV) at 410 nm. The proposed procedure was applied to real samples for the determination of titanium (IV), and the results were in a good agreement with the values certified by inductively coupled plasma-atomic emission spectrometry (ICP-AES).

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Al2O3-TiO2 composite oxide films on etched aluminum foil fabricated by electrodeposition and anodization

Cited by 12 publications

References 32 publications

Effect of the Thickness of Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Composite Oxide Films on the Electrical Properties of Anode Al Foils

Effect of the Thickness of Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Composite Oxide Films on the Electrical Properties of Anode Al Foils

Performance and Properties of a Ti-Al Composite Anodic Oxide Film on AC-Etched Al Foil

Simple and Rapid Spectrophotometric Determination of Titanium on Etched Aluminum Foils

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