Self-oriented iron oxide nanorod array thin film for photoelectrochemical hydrogen production

Chang, Chih Yung; Wang, Chih-Hao; Tseng, Chung Jen; Cheng, Kong Wei; Hourng, Lih‐Wu; Tsai, Bin Tsang

doi:10.1016/j.ijhydene.2012.01.136

Cited by 41 publications

(16 citation statements)

References 32 publications

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“…4, it can be said that in the anodization process, with an applied voltage of 40 V, the sharp drop of the current behavior in the first 30 s was due to the formation of initial oxide layer, followed by an increase in current due to the oxide layer pitting by the fluoride ions in the chemical dissolution process, and the current gradually increased. It was suggested that the formation of a passive film onto the iron surface upon anodizing anodization process in ethylene glycol solutions containing some fluorides and water proceeds via two reactions [25]:…”

Section: Anodization Process Of Iron Foilmentioning

confidence: 99%

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Momeni

Ghayeb

Mohammadi

2014

J Mater Sci: Mater Electron

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Self-organized iron oxide nanotubes were successfully prepared on the iron foils by a simple electrochemical anodization method in NH 4 F organic electrolyte. The Fe 2 O 3 nanotubes were characterized by field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, UV-vis absorbance spectra, and X-ray diffraction spectroscopy. Scanning electron microscopy images show that dependent upon the anodizing time, the pore diameters range from 30 to 45 nm. Crystallization and structural retention of the synthesized structure are achieved upon annealing the initial amorphous sample in oxygen atmosphere at 450°C for 1 h. The crystallized nanoporous film, having a 2.04 eV bandgap, exhibited a maximum photocurrent density of 0.68 mA cm -2 in 1 M NaOH at 0.5 V versus Ag/AgCl. The current potential characteristics showed that the water-splitting photocurrent strongly depends on the anodizing time and its increases with anodization time.

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Section: Anodization Process Of Iron Foilmentioning

confidence: 99%

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Momeni

Ghayeb

Mohammadi

2014

J Mater Sci: Mater Electron

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“…3.d. On the other hand, the porous micro-rod clusters [16], are formed (as shown in fig. 4), at preparation conditions, 7 wt % KOH, 20 Vol % NPA, and sonication time 3 hours.…”

Section: Resultsmentioning

confidence: 99%

Studying the wetting agent impact in the porous silicon production

Nabil¹,

Motaweh²

2019

Egypt. J. Chem.

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N EWLY, porous silicon (PS) powder has been developed to meet the requirements of various fields due to its unique physical and chemical properties. In this research, the PS powder is produced using a combination of both (alkali chemical etching and ultra-sonication techniques) from commercial polycrystalline silicon powder. It shows the dependence of the crystal structure and the morphology on the value of wetting agent concentration, which is controlled on the rate of each chemical reaction in the formation process. For the first time, the PS pines shape is a product at using the preparation conditions (7 wt %KOH, 3 hours, and 15 Vol% NPA). On the other hand, the (PS) micro-rod clusters are produced with different values of both the diameter and the pore size at wetting agent concentrations variation (20, and 25 Vol% NPA). The most stable crystal structure of silicon surface is Si (111), it has a rhombohedral unit cell. By changing the wetting agent concentration value, then the crystal structure of the product powder is changed too, from rhombohedral plane Si (111) to the hexagonal plane Si (211). So, this increases the chances of using the PS product in many fields whether medical or engineering.

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“…To achieve this goal with high efficiency, materials used in water splitting devices should be naturally abundant, have high absorbance for solar radiation, possess proper energy level positions and fast kinetics for oxygen evolution reaction or hydrogen evolution reaction, and must be stable under the harsh working conditions. Although Groups III-V semiconductors exhibit good photoelectrochemical energy conversion efficiency [4], transition-metal oxide, such as BiVO 4 [5][6][7][8][9], Cu 2 O [10][11][12], Fe 2 O 3 [13][14][15][16][17][18][19], and WO 3 [20,21] have attracted great attention as the photoanode due to their good stability and Earth-abundance. Among them, hematite (α-Fe 2 O 3 ) has the potential for achieving high energy conversion efficiency because of its suitable energy bandgap of ≈2.2 eV.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of NixFe1−xOy Electrocatalyst on Hematite as Photoanode for Solar Hydrogen Production

Yen

Wang

et al. 2017

Catalysts

Self Cite

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Abstract:The use of hematite as the photoanode for photoelectrochemical hydrogen production by solar energy has been actively studied due to its abundance, stability, and adequate optical properties. Deposition of an electrocatalyst overlayer on the hematite may increase kinetics and lower the onset potential for water splitting. Ni x Fe 1−x O y is one of the most effective electrocatalysts reported for this purpose. However, the condition and results of the previous reports vary significantly, and a comprehensive model for Ni x Fe 1−x O y /hematite is lacking. Here, we report a simple and novel chemical bath deposition method for depositing low-onset-potential Ni x Fe 1−x O y electrocatalyst on hematite. With a Ni percentage of 80% and an immersion time of 2 min, the as-prepared Ni x Fe 1−x O y overlayer raised the photovoltage from 0.2 V to 0.7 V, leading to a cathodic shift of the onset potential by 400 mV, while maintaining the same level of current density. The dependence of the electrochemical and photoelectrochemical characteristics of the photoanode on the condition of the electrocatalyst was studied systematically and explained based on energy level diagrams and kinetics.

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Self-oriented iron oxide nanorod array thin film for photoelectrochemical hydrogen production

Cited by 41 publications

References 32 publications

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Studying the wetting agent impact in the porous silicon production

Characteristics of NixFe1−xOy Electrocatalyst on Hematite as Photoanode for Solar Hydrogen Production

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