Effect of Oxidation Temperature on Photo-catalytic Properties of Stainless Steel Coated by Copper Oxide

Morita, Motoaki; Kishihara, Kengo; Motoda, Shin-ichi; Koga, Norimitsu; Shinohara, Tadashi

doi:10.2355/isijinternational.isijint-2017-087

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…The passivated substrate was deposited with pure copper in the vacuum vapor deposition chamber. The conditions for vacuum deposition were 0.4 mPa and a current of 40 A with 1.3 volts [43]. The thickness of the copper deposited was less than 0.3 µm.…”

Section: Preparation Of Titanium Dioxide Electrodementioning

confidence: 99%

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

2022

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One of the effective ways of utilizing marine environments is to generate energy, power, and hydrogen via the effect of photocatalysts in the seawater. Since the ocean is vast, we are able to use its large area, but the power generation system must be of low cost and have high durability against both force and corrosion. In order to meet those requirements, this study focuses on the fabrication of a novel marine wet solar cell composed of a titanium dioxide photoanode and a copper oxide photocathode. These electrodes were deposited on type 329J4L stainless steel, which possesses relative durability in marine environments. This study focuses on the characterization of the photocatalytic properties of electrodes in seawater. Low-cost manufacturing processes of screen-printing and vacuum vapor deposition were applied to produce the titanium dioxide and copper oxides electrodes, respectively. We investigated the photopotential of the electrodes, along with the electrochemical properties and cell voltage properties of the cell. X-ray diffraction spectroscopy (XRD) of the copper oxides electrode was analyzed in association with the loss of photocatalytic effect in the copper oxides electrode. Although the conversion efficiency of the wet cell was less than 1%, it showed promising potential for use in marine environments with low-cost production. Electrochemical impedance spectroscopy (EIS) of the cell was also conducted, from which impedance values regarding the electrical properties of electrodes and their interfaces of charge-transfer processes were obtained. This study focuses on the early phase of the marine wet solar cell, which should be further studied for long-term stability and in actual marine environmental applications.

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Section: Preparation Of Titanium Dioxide Electrodementioning

confidence: 99%

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

2022

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“…To meet those requirements, we have been conducting a research concerning a wet solar cell using two photocatalytic semiconductors with seawater electrolyte that is aimed to be used in marine environment [1][2][3][4][5][6][7]. This wet solar cell composed of two photo electrodes: n-type photocatalytic semiconductor titanium dioxide anode and p-type photocatalytic semiconductor copper oxides cathode [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Photocatalytic Effects of Dye Sensitized Titanium Dioxide by Hydroxyapatite Coating

Wunn¹,

Motoda²,

Morita³

et al. 2020

EngJ

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Applying photocatalytic n-semiconductor effect of titanium dioxide, performance of TiO 2 anode with copper oxides cathode as a wet solar cell in seawater is being studied. This research aimed to study photocatalytic effects of dye sensitized TiO 2 electrode coated by hydroxyapatite (HAp). TiO 2 electrode was manufactured double layered by screen printing method and copper oxides electrode by vacuum deposition on Type 329J4L stainless steel base substrate. N719 Ruthenizer dye was used for sensitizing on TiO 2 electrode and HAp was coated on the electrode surface by squeegee printing method. Four types of TiO 2 electrodes were studied; TiO 2 electrode, dye-sensitized TiO 2 , HAp coated TiO 2 , and dye-sensitized TiO 2 with HAp coating. Cell voltage and current density was measured under irradiated and dark conditions. The power densities of electrode with HAp coating was found higher than other electrodes without HAp. The current flow was enhanced by introducing HAp coating while dye sensitizing reduced current flow. Cyclic voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) analysis were performed. EIS analysis showed HAp coating increased capacitance values of each electrodes. The surface of electrodes analysed by Scanning Electron Microscope (SEM) and Electron Dispersion X-ray Spectroscopy (EDS) indicated that HAp was dispersed on TiO 2 surface but was not formed as a layer.

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“…We have so far studied to improve the photocatalytic properties of TiO2 such as the effect of heat treatment, the effect of using double-layer film forming method, and also the effect of dye-sensitizing (3). On the other hand, the photocathodic effect of copper oxides (copper (II) Oxide (CuO) and copper (I) Oxide (Cu2O)) electrode has also been studied such as the effect of oxidation temperatures on copper oxides photocatalytic properties (12). We have also studied the properties of stainless steel substrate used as a base metal for those electrodes.…”

Section: Introductionmentioning

confidence: 99%

Devising the Specification of a Solar Cell Utilizing TiO₂ Photoanode and Copper Oxides Photocathode

Wunn¹,

Tanifuji²,

Motoda³

et al. 2018

ECS Trans.

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Titanium dioxide (TiO2) and copper oxides have been known for n-type and p-type semiconductor photocatalytic effects respectively. In this research, a solar cell was constructed with TiO2 and copper oxides as anode and cathode of the cell with seawater electrolyte. The polarization of TiO2 and copper oxides was measured. The cell current density and cell power density against cell voltage were measured and analysed. From those results, Electrochemical Impedance Spectroscopy (EIS) was performed. The Cole-Cole plot was obtained, and equivalent circuit was constructed. The results were compared with TiO2 vs Stainless steel cell results since stainless steel is base substrate of copper oxides electrode and its passive film shows photocatalytic semiconductor effect. The power density of TiO2 vs copper oxides cell was much higher than that of TiO2 vs Stainless steel cell. By EIS analysis, internal resistance of the cell was reduced by introducing copper oxides electrode to the cell.

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Effect of Oxidation Temperature on Photo-catalytic Properties of Stainless Steel Coated by Copper Oxide

Cited by 4 publications

References 33 publications

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Improvement in Photocatalytic Effects of Dye Sensitized Titanium Dioxide by Hydroxyapatite Coating

Devising the Specification of a Solar Cell Utilizing TiO₂ Photoanode and Copper Oxides Photocathode

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Effect of Oxidation Temperature on Photo-catalytic Properties of Stainless Steel Coated by Copper Oxide

Cited by 4 publications

References 33 publications

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Fabrication and Characterization of a Marine Wet Solar Cell with Titanium Dioxide and Copper Oxides Electrodes

Improvement in Photocatalytic Effects of Dye Sensitized Titanium Dioxide by Hydroxyapatite Coating

Devising the Specification of a Solar Cell Utilizing TiO2 Photoanode and Copper Oxides Photocathode

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Devising the Specification of a Solar Cell Utilizing TiO₂ Photoanode and Copper Oxides Photocathode