Morphology, structural and optical properties of iron oxide thin film photoanodes in photoelectrochemical cell: Effect of electrochemical oxidation

Influence of anodization time on the surface modifications on α-Fe2O3photoanode upon anodization

“…The estimated average crystallite size was observed to range from ;31 to 44 nm. The obtained crystallite size range values are close to values previously obtained for the films that were subjected to 500 mV constant anodic potential for 1 min, 32 regardless of the difference in exposure time. There was no clear correlation between crystallite size and anodization time.…”

“…9,15,30,31 Recently, x-ray diffractometry revealed significant modifications on the crystallographic structure and morphology at the surface upon anodization at 500 mV versus Ag/AgCl for just 1 min. 32 In particular, a significant grain growth at the surface by a 3 factor of magnitude was observed. Microstructure, in particular the crystallinity, crystallite size, shape, spatial distribution, and morphology have an important influence on electrical, optical, and catalytic properties of semiconductor materials.…”

Magnetic and structural characteristics associated with the transformation of As(v)-coprecipitated ferrihydrite to hematite: implications for magnetic enhancement in soils and sediments

“…In addition to structural OH, the incorporated As( v ) may produce Fe deficiencies in hematite. Red shifts of the Raman peaks correlate with an increase in the force constants such as Fe–O bond length 66 and lattice expansion, 67 as a result of local lattice disorder in hematite structure. Therefore, the observed broadened and notable red shifts of Raman peaks at ∼222, ∼289, and ∼403 cm −1 as the Fe/As( v ) molar ratio is decreased from 100 to 40, is indicative of the increasing mean Fe–O distance and lattice expansion in As( v )-hematite.…”

Determining the Efficiency of Photoelectrode Materials by Coupling Cavity‐Microelectrode Tips and Scanning Electrochemical Microscopy

“…For example, titanium dioxide has a sufficient stability but its wide band gap (around 3.2 eV) excludes the absorption of visible light . On the other hand, materials like WO 3 , Fe 2 O 3 , BiVO 4 or Cu(I) and Cu(II) oxides can absorb part of the visible spectrum but are still under characterization in terms of stability and performances …”