A novel method for controlled synthesis of nanosized hematite …
The above experiment was repeated in order to observe the effect of NH3 vapor concentration on the film morphology. The films were formed by using 4%, 6%, and 8% volume of NH3 in the reaction chamber. ... (2007) Enhancement of photoelectrochemical hydrogen production from hematite thin films by the introduction of Ti and Si. J Phys Chem C 111: ...
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Enhancement of Water Oxidation Photocurrent for Hematite Thin Films
Hematite photoanodes were prepared by anodic electrodeposition in the presence of polyvinylpyrrolidone (PVP). PVP has been shown to alter hematite nanoparticle morphology, but has
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In situ adsorption densities of polyacrylates on hematite nano-particle
The adsorption isotherms obtained in this study were constructed by flowing polymer solutions of fixed concentrations past the cast hematite film consecutively. This strategy provides a consistent surface area for each known equilibrium solution polymer concentration, as only one film is used and the solution concentration is maintained. ...
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A highly transparent thin film hematite with multi-element dopability
A schematic of a tandem cell with a configuration of a hematite/perovskite solar cell (PSC) with hematite films having two representative thicknesses (350nm (T) vs. 70 nm (t)) is shown in Fig. 1 a.The film thicknesses of 350nm and 70nm in this study were chosen by optimizing the transmittance and photocurrent density of hematite, as shown in Fig. S1.
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Pristine and Al-doped hematite printed films as …
The deposited iron oxide thin films show the single hematite phase with polycrystalline rhombohedral crystal structure with crystallite size 20–40 nm. Optical analysis enabled to point out the increase in direct band-gap energy from 2.2 to 2.25 eV with doping concentration which is attributed to a blue shift.
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Defectronics based photoelectrochemical properties of Cu
The high concentration of Cu 2+ ion doping into hematite thin film decreased PEC activity due to the defects induced by crystal structure distortion of hematite thin film. It suppresses the ...
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Electrochemical Deposition of Hematite α-Fe2O3 Thin Films …
Abstract In the field of sustainable hydrogen production, hematite (α-Fe2O3) is a promising material owing to its optical band gap and water oxidation/reduction energies. In this context, the main objective of this work is devoted to the synthesis of α-Fe2O3 by electrochemical anodization of iron sheet using two anodization voltages (20 and 30 V), followed by annealing …
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Facile preparation of Zn-doped hematite thin film as …
A simple and cost-effective fabrication of the Zn-doped α-Fe 2 O 3 thin film as a photocathode for solar hydrogen generation was proposed in this study. Transparent Zn-doped α-Fe 2 O 3 films were prepared by a spin-coating process using nontoxic iron chloride as the iron precursor and zinc chloride as an acceptor dopant, and the thermal treatment at 550 °C in air subsequently …
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Tuning of opto-electrical properties of hematite thin films …
Optical and electronic properties of hematite thin films can be enhanced/tuned using doping or additive-based strategies. An application oriented sol–gel method is used for …
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Catalysts | Free Full-Text | Sn-Doped Hematite Films as
We failed to find published data on the photoelectrooxidation of one, two and three atomic alcohols on hematite thin films with different doping concentration of Sn 4+. Comparison with similar data that was measured by our group on films of hematite modified with Bi, Co, Ti and ZnO [26-28] shows that hematite doped with tin has the greatest ...
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Hematite
METAL OXIDES. A.C. Scheinost, in Encyclopedia of Soils in the Environment, 2005 Hematite (α-Fe 2 O 3)Soils forming at subtropical or tropical climates often have reddish or even purplish hues (8.0 R–1.4 Y), derived from blood-red hematite.Hematite usually coexists with goethite, but, due to its greater tinting strength, masks the yellowish color of goethite even at low concentrations.
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Ti-doped hematite thin films for efficient water splitting
Uniform Ti-doped hematite thin films were deposited on transparent fluorine-doped tin oxide FTO coated glasses using a pulsed laser deposition method. An influence of dopant concentration on the photoelectrochemical characteristics was examined under water splitting. Photocurrent measurements indicated that 3 mol% of Ti atoms was optimal dopant concentration in …
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(PDF) Characterization of Zn-doped hematite thin films for
Characterization of Zn-doped hematite thin films for photoelectrochemical splitting of water
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Electrochemical Deposition of Hematite α-Fe2O3 Thin Films …
The obtained results indicate that the α-hematite thin films synthesized by anodization technique under optimized conditions is a promising photoanode in PEC cells. In …
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A nanostructured hematite film prepared by a facile "top …
To overcome tough conditions currently used for the preparation of nanostructured hematite films on a conducting substrate, a rational and easy method of chemical etching …
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Defectronics based photoelectrochemical …
Si-doped hematite thin film prepared by APCVD yielded higher IPCE value of 42% at 370 nm at 1.23 V vs RHE than pristine hematite electrodes. Especially, Grätzel group reported that the...
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Tuning of oxygen vacancy-induced electrical conductivity in …
The as-grown hematite film was found to have the highest carrier concentration of 1.09×10 20 cm −3 and the lowest resistivity of 5.9×10 −2 Ω-cm.
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Sensing characteristics of hematite and barium oxide doped hematite …
The 700 °C (1 hour) annealed films showed significant responses to O 3 at temperatures ranging from 150 °C to 300 °C. Although, hematite is an n-type semiconductor, the Fe 2 O 3 and BaO-Fe 2 O 3 films exhibit p-type behavior to O 3 and n- type behavior to NO 2 at the studied concentration ranges in this work. The response to oxidizing gases ...
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Vibrational Spectroscopic Characterization of Hematite, …
ystal-line thin (40-250 nm) hematite, maghemite, and magnetite films through the use of conventional electron-beam evapo-ration. These films are primarily characterized with Ram. n …
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Ultrathin Hematite‐Hercynite Films for Future Unassisted …
The low intensity of hematite peaks indicates its low concentration or film thickness compared to the hercynite phase. The two additional peaks at 30.6° and 32° that most likely correspond to the wüstite phase (Figure S2, Supporting Information) were detected from alloys oxidized at 685 °C for 5 min.
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New rotating disk hematite film electrode for riboflavin …
With each successive increase in hematite concentration, the half-wave potential shifted farther away from the formal reduction potential of ferricyanide (Fig. 2 B). This indicates that each CV scan deposited more hematite or the film quality (i.e. density) changed. Ultimately, the presence of the hematite film impeded ferricyanide reduction.
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(PDF) Tuning of opto-electrical properties of hematite thin films …
Hematite thin films have attracted widespread interest in recent years because of their advanced electronic and optical properties. Optical and electronic properties of hematite thin films can be enhanced/tuned using doping or additive-based
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The effects of applied current density and bath …
Hematite films with finer morphologies are formed as the applied current density and bath concentration increases in their respective appropriate ranges (1–4 mA cm −2 and …
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Tuning of oxygen vacancy-induced electrical conductivity in …
Therefore, the Ti-doped hematite films are n-type in nature and the value of Seebeck coefficient indicates a doped semiconductor with high carrier concentration. Figure 2(c) shows the sheet ...
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A novel method for controlled synthesis of nanosize …
Hematite (α-Fe2O3) films having high quality surface morphology have been formed at the liquid-vapor interface ... The above experiment was repeated in order to observe the effect of NH3 vapor concentration on the film morphology. The films were formed by using 4%, 6%, and 8% volume of NH3 in the reaction chamber. Similarly, a
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(PDF) Characterization of Zn-doped hematite thin films for
Characterization of Zn-doped hematite thin films for photoelectrochemical splitting of water. CHANAKYA TRIPATHI. See full PDF download Download PDF. Related papers. Nanostructured Zn-Fe2O3 thin film modified by Fe-TiO2 for photoelectrochemical generation of …
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Synthesis and characterization of porous TiO2 film …
In this work, porous TiO 2 film decorated with bilayer hematite (nanoparticles/nanorods) were synthesized via the electrodeposition technique followed by hydrothermal treatment. Structural and morphological properties of the TiO 2 /bilayer hematite films were determined by X-ray diffraction (XRD), Also with energy dispersive X-ray spectral …
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Electrodeposition and Characterization of Hematite Films Obtained …
On the other hand, when comparing the structural properties of hematite films grown electrochemical at different electrolytic bath temperatures (50 and 100°C), but annealed at the same temperature ... Table III shows the donor carrier concentration of the films obtained at different electrolytic bath and annealing temperatures. It can be seen ...
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Mg-induced phase transformation from hematite to maghemite
Specifically, a thin hematite film with a corundum structure was fully phase-transformed to magnetite with an inverse spinel structure at a Ge concentration of 5.5 at.% . This technique is quite simple, with a sputtering target of Ge chips set on ceramic hematite in a pure Ar atmosphere on a water-cooled substrate.
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Photoelectrochemical Detection of Calcium Ions Based on Hematite …
α-Fe 2 O 3 (hematite) thin films have been shown to be a robust sensor substrate for photoelectrochemical imaging with good stability and high spatial resolution. Herein, one-dimensional (1D) hematite nanorods (NRs) synthesized via a simple hydrothermal method are proposed as a substrate which provides nanostructured surfaces with enhanced photocurrent …
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