The optical, structural and photoelectrochemical characteristics of porous hematite hollow spheres prepared by DC magnetron sputtering process via polystyrene spheres template

Huang, Mao Chia; Wang, TsingHai; Wu, Chien-Hsing; Chang, Wen Sheng; Lin, Jiaping; Yen, Tzu-Hsiang

doi:10.1016/j.ceramint.2014.03.029

Cited by 27 publications

(18 citation statements)

References 30 publications

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“…Figure 4(b) shows the Mott-Schottky plots for NTs and NPs. Both of them displayed n-type behavior as indicated by the positive slope in Mott-Schottky plots [11][12][13] and also agreed well with the result of PEC response. The carrier concentration of NTs was 1.54´10 21 cm -3 which was concurrently about 2.8 times larger than NPs (5.471 0 20 cm -3 ).…”

supporting

confidence: 73%

“…5,10,12,15 Methods to prepare iron oxide photoanode are versatile, including hydrothermal method, electrochemical process, sol-gel method and reactive-sputtering process. 5,10,12,[15][16][17][18] Among these techniques, electrochemical anodizing process is widely used in order to obtain various dimensions of oxide materials with specific chemical and physical properties. 15,19 Electrochemical method also offers several advantages as: low cost, possibility of large-scale deposition and low temperature processing in comparison with other deposition techniques.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14] Among these investigated semiconducting materials, iron oxide had attracted increasing interest for PEC application due to its suitable band gap (~2.0 eV) for incident sunlight absorption (~40%), stability in electrolyte, low cost, non-toxic and environmental compatibility. 5,10,12,15 Methods to prepare iron oxide photoanode are versatile, including hydrothermal method, electrochemical process, sol-gel method and reactive-sputtering process. 5,10,12,[15][16][17][18] Among these techniques, electrochemical anodizing process is widely used in order to obtain various dimensions of oxide materials with specific chemical and physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…With applying more positive voltage, the photo-enhancement current density of two samples also increased which can be attributed to an n-type behavior. 12,19,28 It is clear that NTs possessed a better photocurrent, around 0.10 mA/cm 2 at 0.4 V vs. Ag/AgCl, which is about 2.5 times higher than that of NPs (0.04 mA/cm 2 ). It is notice that PEC response of NPs is lower than the result of NPs by Rangarju et al, 29 as might relate to lower electrical conductivity of oxide due to less oxygen vacancies in oxide structure in non-reducing atmosphere.…”

mentioning

confidence: 96%

“…Information on the charge transfer process can be deduced from the Nyquist plots where the diameter of the semicircles can be interpreted to the charge transfer resistance of the sample. 11,12,14,19 The EIS measurements were carried out at 0.4 V vs. Ag/AgCl. From Figure 5(a), we found that NTs have a lower semicircle than NPs.…”

mentioning

confidence: 99%

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Anodized Iron Oxide Nanostructures on Different Carbon Steels for Photoelectrochemical Water Splitting

Deng

Huang

Weng

et al. 2016

J Chinese Chemical Soc

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In this study, two different nanostructural iron oxide films were prepared on two kinds of carbon steels (CS) with different contents of impurities via anodization in a mixture of aqueous ammonium fluoride solution and ethylene glycol, respectively, and apply to photoelectrochemical (PEC) water splitting. After annealing, iron oxide nanotubes (NTs) was coated on surface of lower purity CS and iron oxide nanoporous (NPs) was coated on surface of higher purity CS via scanning electron microscope. X-ray diffraction pattern shows both of samples contain a major phase of a-Fe 2 O 3 and a slight phase of Fe 3 O 4 . Compared with NPs, NTs behaves better absorbance ability in visible spectra range via UV-visible absorbance spectra. From PEC response, the iron oxide NTs showed higher water splitting performance (0.10 mA/cm 2 at 0.4 V vs. Ag/AgCl) than NPs (0.04 mA/cm 2 at 0.4 V vs. Ag/AgCl) due to better absorbance, higher carrier concentration and low charge transfer resistance.

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supporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 96%

mentioning

confidence: 99%

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Anodized Iron Oxide Nanostructures on Different Carbon Steels for Photoelectrochemical Water Splitting

Deng

Huang

Weng

et al. 2016

J Chinese Chemical Soc

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Iron oxide nanotube film formed on carbon steel for photoelectrochemical water splitting: effect of annealing temperature

Deng

Huang

Weng

et al. 2016

Surface & Interface Analysis

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Carbon steels (CSs) were anodized in an ethylene glycol solution containing 3 vol.% H 2 O and 0.1 M NH 4 F to coat with nanotube arrays film. The as anodized nanotube arrays film were annealed in argon atmosphere at various temperatures ranging from 250 to 550°C for 4 h. The morphology and crystal phases of the film developed after annealing processes were examined using field emission scanning electron microscopy, X-ray diffraction. Morphology transforms from nanobube arrays to nanotube bundles at 250°C, to nanobube bundles with nanoflakes at 350 and 450°C, to nanotube bundles with nanobelts at 550°C. Amorphous transformed completely into maghemite at 350°C and hematite with minor magnetite at 450 and 550°C. Diffuse reflectance ultraviolet and visible spectra revealed iron oxide nanotube film annealed at 350°C, or higher than 350°C behaved tremendous absorbance ability in visible spectra range. Mott-Schottky analysis and linear scan voltammetry were performed in 1 M NaOH to show that iron oxide nanotube film annealed at 450°C exhibited best charge carrier transfer ability upon illumination and superior photoelectrochemical properties compared with the films annealed at other temperatures. The film annealed at 450°C displayed the photocurrent density of 0.13 mA cm À2 at 0.2 V Ag/AgCl , but the film annealed at other temperatures with the photocurrent densities of lower than 0.05 mA cm À2 at 0.2 V Ag/AgCl . The morphology and phase transform of iron oxide nanotube film at different annealing temperature results in the change of their photoelectrochemical properties.

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The Potential of Fe‐Based Magnetic Nanomaterials for the Agriculture Sector

et al. 2022

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Iron‐based magnetic nanoparticles (MNPs) have been studied extensively for the past few decades. They have been applied in various applications, particularly in the biomedical sector. Due to their excellent physical and chemical properties, they have also been used widely in the agricultural sector. MNPs can be synthesized inexpensively and applied in large scale agricultural activities. This paper highlights the applications of iron‐based MNPs in the agricultural sector mainly as antimicrobial agents, plant growth promoters, site‐targeted delivery agents, nanosensors, detection and remediation for pesticide residue. Furthermore, the toxicity and transport of iron‐based MNPs in the soil‐plant system are also elucidated. These aspects have to be well‐understood before MNPs can be fully implemented effectively this pin the agricultural sector. Lastly, a hybrid nanomaterial, which is consisted of iron and magnesium oxide (MgO) nanoparticles (NPs), is proposed. This hybrid nanomaterial is expected to overcome the shortcomings of iron‐based MNPs.

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The optical, structural and photoelectrochemical characteristics of porous hematite hollow spheres prepared by DC magnetron sputtering process via polystyrene spheres template

Cited by 27 publications

References 30 publications

Anodized Iron Oxide Nanostructures on Different Carbon Steels for Photoelectrochemical Water Splitting

Anodized Iron Oxide Nanostructures on Different Carbon Steels for Photoelectrochemical Water Splitting

Iron oxide nanotube film formed on carbon steel for photoelectrochemical water splitting: effect of annealing temperature

The Potential of Fe‐Based Magnetic Nanomaterials for the Agriculture Sector

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