On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

Mizuhata, Minoru; Katayama, Akihito; Maki, Hideshi

doi:10.1016/j.jfluchem.2014.12.001

Cited by 5 publications

(6 citation statements)

References 38 publications

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“…As suggested film formation reactions in the literature, the concentrations of F − and H + ions on the specimen surface can be increased even if boric acid (H 3 BO 3 ) is added to the solution to remove these ions. Because of the presence of these harmful ions, the aluminum substrate is easily dissolved when dipped in the LPD solution.…”

Section: Methodscontrasting

confidence: 97%

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Formation of oxide films for high‐capacitance aluminum electrolytic capacitor by liquid‐phase deposition and anodizing

Sakairi

Fujita

Nagata

2015

Surface & Interface Analysis

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Liquid phase deposition (LPD) treatment and anodizing were used to form oxide layer for a high-capacitance aluminum electrolytic capacitor. Formation of protective oxide layers and modification of LPD conditions make it possible to prolong the LPD duration and lead to the formation of TiO 2 and NaF deposits on aluminum. A titanium oxide / aluminum oxide mixed layer was formed by a combination process of LPD treatment and anodizing. The capacitance of the formed layer was about 300% higher than that of an anodic oxide film formed on electropolished aluminum. The structures and compositions of the films that were formed were determined by transmission electron microscopy, scanning electron microscopy, and Rutherford backscattering spectroscopy.

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Section: Methodscontrasting

confidence: 97%

“…The formed film had low water contact angle around 4°, and the average reflectance of TiO 2 /Si structure was 5.3%. Mizuhata et al reported formation of TiO 2 /porous Si nonocomposites for lithium ion battery by LPD with anodizing . The formed TiO 2 /porous Si showed high charge/discharge capacity without rapid degradation.…”

Section: Introductionmentioning

confidence: 99%

Formation of oxide films for high‐capacitance aluminum electrolytic capacitor by liquid‐phase deposition and anodizing

Sakairi

Fujita

Nagata

2015

Surface & Interface Analysis

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“…The preparation of functional materials in the mesopores of porous substrates is a popular approach for enlarging surface area. It is expected that nanocomposites with porous materials have high performance as seen in the fields of catalysis [1], gas sensors [2,3] and electrode batteries [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Hence to fabricate ZnS/PSi nanocomposites that retain a porous structure, wet processes such as electrodeposition and liquid phase deposition, originally developed by us, are ideal. Accordingly, in our previous study, a TiO 2 thin film was deposited onto the surface of mesopores of PSi by liquid phase deposition [8]. On the other hand, though it is not clarified still completely, the reaction mechanism of the electrodeposition of ZnS can be considered as follows:…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnS/Porous Silicon Composite and Its Enhancement of Photoluminescence

Mizuhata

Mineyama

Maki

2016

Electrochimica Acta

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A ZnS thin film was electrodeposited on the surface of nanopores of porous silicon (PSi) without plugging of the nanopores. And the optical properties of the ZnS/PSi composites were investigated. The PSi was fabricated by anodization of n-Si (100) wafer in HF/EtOH/H 2 O solution under constant current conditions. The pore diameter and the porous layer depth of the PSi were 20-80 nm and 8-50 μm, respectively, and they are controlled by variation of the HF concentration and anodization time. Electrodeposition proceeded on the surface of the nanopores (pore diameter, 80 nm) of the PSi under galvanostatic conditions of 0.44-8.85 mA/cm 2 and the aqueous electrolyte solution contained ZnSO 4 , Na 2 S 2 O 3 and glycerol. The deposited ZnS plugged the nanopores at high current density, whereas at low current density, ZnS was deposited on the nanopore wall without plugging. The photoluminescence (PL) spectra due to the ZnS/PSi composites showed two separate peaks at 430 nm and 530 nm. The PL intensity decreased with increased current density because of the segregation of ZnS on the upper parts of the PSi nanopores. The PL intensity was also enhanced owing to the large surface area of the PSi.

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“…33) Moreover, the optimum conditions for the syntheses of 3d transition metal oxide thin films were investigated by controlling the pH and concentration of reacting species. 34) From the results, a precise rate control is established for the LPD process using various nano-ordered materials, such as MCM-41, 35) Nafion membrane with ionic clustering structure, 36) and porous Si, 37) applied to electrochemical materials. This study summarizes my involvement in the research of ceramics synthesis using aqueous solutions and progression to the latest research on nanostructured materials.…”

Section: Introduction -Positioning Liquid-phase Deposition Methods In...mentioning

confidence: 99%

Aqueous solution reaction during liquid-phase deposition and its application in electrochemical materials

Mizuhata

2022

J. Ceram. Soc. Japan

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The study systematically attempts to synthesize a number of metal oxides using a liquid-phase deposition method and hydrolysis reaction of metal fluoride complexes. Instead of the conventional empirical optimization, the insolution equilibrium is precisely analyzed and desired oxides possessing nano-order structures and thin-film geometries are synthesized. By synthesizing oxides with ordered structures and large specific surface areas, materials with a high affinity for electrochemical reactions is developed, which contributes to the development of the science of such reactions.

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On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

Cited by 5 publications

References 38 publications

Formation of oxide films for high‐capacitance aluminum electrolytic capacitor by liquid‐phase deposition and anodizing

Formation of oxide films for high‐capacitance aluminum electrolytic capacitor by liquid‐phase deposition and anodizing

Fabrication of ZnS/Porous Silicon Composite and Its Enhancement of Photoluminescence

Aqueous solution reaction during liquid-phase deposition and its application in electrochemical materials

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