Comparative study of α-Fe2O3 films prepared by electrodeposition and spray pyrolysis methods as photoanode

Heidari, G.; Rezaei, Sajjad; Shirmahd, H.

doi:10.1007/s10854-017-8458-1

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…4, it was calculated that the energy bandgap of the hematite thin films annealed at temperatures between 500°C to 600°C lay between 2.12 eV and 2.08 eV, compatible with literature values. 34,48…”

Section: Uv-vis Spectral Analysismentioning

confidence: 99%

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Demircioğlu

Demir

2021

Journal of Elec Materi

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Hematite (Fe 2 O 3 ) thin films have been synthesized on indium tin oxide (ITO)coated glass substrate using an electrodeposition technique and the changes in their structure due to subsequent annealing at different temperatures investigated. The structural, optical, and morphological properties of Fe 2 O 3 thin films formed after annealing at temperatures of 500°C, 550°C, and 600°C after deposition were determined by x-ray diffraction (XRD) analysis, absorption spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). XRD analysis of the annealed electrodeposited samples revealed Fe 2 O 3 thin films with rhombohedral crystal structure. The energy bandgap of the Fe 2 O 3 films grown on ITO and annealed at different temperatures was calculated based on absorption measurements, yielding values between 2.0 eV and 2.2 eV. Raman peaks were observed between 210 cm À1 and 1305 cm À1 depending on the annealing temperature. SEM analysis clearly revealed the crystal structure belonging to Fe 2 O 3 and an increase in the particle size as the annealing temperature was increased. The surface roughness values (in the range from 11 nm to 46 nm) obtained from AFM images of the samples annealed at different temperatures were compatible with the average roughness values (in the range from 14 nm to 51 nm). The results of these analyses confirm that the structure of the a-Fe 2 O 3 thin films was improved by increasing the annealing temperature. Electrochemical impedance spectroscopy (EIS) and Tafel measurements enabled detailed examination of the corrosion behavior of the a-Fe 2 O 3 films deposited on the ITO substrate. Nyquist and Bode analyses were applied to determine the structural changes to the Fe 2 O 3 and its corrosion behavior. The R s values calculated with the help of Nyquist plots increased from 65.10 X cm 2 to 540.5 X cm 2 with increase of the annealing temperature, while the R ct values decreased from 64.29 9 10 9 X cm 2 to 1.142 X cm 2 after annealing. The corrosion current and potential parameters were also calculated from Tafel measurements after deposition and annealing at different temperatures.

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Section: Uv-vis Spectral Analysismentioning

confidence: 99%

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Demircioğlu

Demir

2021

Journal of Elec Materi

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“…The electrodes have been prepared by drop casting the samples on to the glassy carbon (GC) electrode which acts as the working electrode . Different types of coating techniques can be utilized for the deposition of samples on the working electrode such as drop casting, spin coating, dip coating, blade coating, and spray coating . In dip coating, the electrode is dipped on to the nanomaterial solution for a certain time and withdrawn at a fixed speed.…”

Section: Introductionmentioning

confidence: 99%

Functionalized polystyrene maleic anhydride copolymer/ZnO nanocomposites for enhanced electrochemical performance

Simon

Chakraborty

Konikkara

et al. 2020

J of Applied Polymer Sci

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Novel functionalized polymeric materials incorporated with metal oxide nanoparticles are of paramount importance in the field of supercapacitors. These materials provide the advantage of enhanced specific capacitance coupled with efficient energy storage characteristics. In the present study, a new electrode material has been prepared by modifying the polystyrene maleic anhydride copolymer with 4,4-diaminodiphenylmethane (DDM). Chemically synthesized zinc oxide nanoparticles were incorporated into the polymer matrix at different weight percentages to form polymer nanocomposites (SMA-DDM-zinc oxide (SDZ)). The effect of increasing the weight percentage of nanoparticles on the modified copolymer was studied in details. The samples were characterized using ultravioletvisible, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and thermogravimetric analysis. SDZ was drop casted on the surface of the glassy carbon electrode and the electrochemical properties were studied. Cyclic voltammetry studies were conducted at various scan rates, and the characteristic curves were observed to be pseudorectangular in nature. The specific capacitance values were measured using the chronopotentiometry technique. SDZ 15% nanocomposite shows an enhanced specific capacitance of 313 F g −1 at a current density of 0.05 A g −1 with a power density of 629 W kg −1 . The superior performance of the SDZ nanocomposite electrodes renders it as a promising material for supercapacitor applications.

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Aerosol-jet-printed potentiometric pH sensor for sweat measurements in smart patches

Dominiczak,

Krzemiński,

Wojcieszek

et al. 2024

Sensing and Bio-Sensing Research

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Comparative study of α-Fe2O3 films prepared by electrodeposition and spray pyrolysis methods as photoanode

Cited by 3 publications

References 29 publications

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Effects of Annealing on Structural, Morphological, and Corrosion Properties of α-Fe2O3 Thin Films

Functionalized polystyrene maleic anhydride copolymer/ZnO nanocomposites for enhanced electrochemical performance

Aerosol-jet-printed potentiometric pH sensor for sweat measurements in smart patches

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