Study of the annealing conditions and photoelectrochemical characterization of a new iron oxide bi-layered nanostructure for water splitting

Abstract

ᵒC • min -1 achieving a photocurrent density of ~ 0.143 mA • cm -2 at 1.54 V (vs. RHE).The results indicate that the bi-layered nanostructure is an efficient photocatalyst for applications such as water splitting.

Influence of electrolyte temperature on the synthesis of iron oxide nanostructures by electrochemical anodization for water splitting

“…Moreover, the use of higher temperatures during anodization can improve the diffusion rate of Fe ions with higher thermal kinetic energy, then, the Fe2O3 etching rate was also faster [5]. oxide nanostructures for photocatalysis [40]. As Figure 6 shows, the peaks for all the samples appeared at the same Raman shifts.…”

“…After anodization, the nanostructures were rinsed with distilled water, dried in a nitrogen stream and annealed in a tube furnace at 500 ⁰C for 1 hour in an argon atmosphere. The heating rate was 15 ⁰C • min -1 and the samples were subsequently cooled within the furnace by natural convection [40].…”

Fabrication of Ordered and High-Performance Nanostructured Photoelectrocatalysts by Electrochemical Anodization: Influence of Hydrodynamic Conditions

“…In order to prepare nanostructures of the oxides described above, various methodologies have been reported, such as sol-gel processes, hydrothermal and solvothermal methods, deposition processes or anodization. Of these, anodization is a fast and simple method to synthesize metal oxide nanostructures [12,[18][19][20][21][22]. With anodization, surface morphology can be designed by adequately controlling several parameters, such as the anodization potential, duration, electrolyte composition, temperature, and so on.…”

“…Different rotation speeds: 0, 1000, 2000 and 3000 rpm, corresponding to Reynolds numbers of 0, 165, 325 and 490, respectively, were applied. Once synthesized, samples were annealed in argon atmosphere for 1 h at 500°C at a heating rate of 15°C • min −1 , and cooled within the furnace by natural convection [21]. Figure 13 shows the different obtained curves during anodization where three stages can be seen for all the cases (scheme in Figure 13).…”

Mesoporous anodic α-Fe2O3 interferometer for organic vapor sensing application

“…Compared with conventional nanofabrication method, electrochemical anodization is a powerful method owing to its simplicity, reliability, high controllability and low cost. 19,20 Recently, anodic iron oxide nanostructures obtained by directly anodizing iron (Fe) metal have aroused wide interest in lithium-ion battery, 21,22 supercapacitor, 23 water splitting, 24 and fuel cell applications 25 because of its excellent optical, electrochemical and photocatalytic properties. However, to our knowledge, anodic a-Fe 2 O 3 for optical sensing of volatile gas vapors have not been reported.…”