Modified annealing approach for preparing multi-layered hematite thin films for photoelectrochemical water splitting

Kyesmen, Pannan I.; Nombona, Nolwazi; Diale, M.

doi:10.1016/j.materresbull.2020.110964

Cited by 19 publications

(9 citation statements)

References 44 publications

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“…Tangents of the plots were extrapolated to obtain the hv-axis intercepts for the bandgap values as shown in figure 10. The bandgap values ranged from 1.89 to 2.08 eV and are closely comparable to reported values worked out from absorbance and Tauc plots of hematite films [15,29].…”

Section: Optical Propertiessupporting

confidence: 85%

“…The absence of extra peaks within the 50°to 70°2-theta angle range further confirms the purity of the hematite NRs. Studies have shown that photo-enhanced charge flow in hematite is reported to be dominant in the (110) plane [29,30]. In this study, the preferential growth in the (110) plane is more exhibited by SC1 and SC4 samples relative to the other films and can influence their photocatalytic properties.…”

Section: Structural Analysismentioning

confidence: 57%

“…Along this line, 3. Positive slopes of the Mott-Schottky plots in figure 12 confirm the n-type semiconductor behavior of hematite [29].…”

Section: Mott-schottky Analysismentioning

confidence: 60%

“…In this study, the preferential growth in the (110) plane is more exhibited by SC1 and SC4 samples relative to the other films and can influence their photocatalytic properties. The low preferential growth in the (110) plane generally observed for the samples is attributed to the low annealing temperature of 500 °C which deterred the samples' crystallinity [31]: an enhancement factor for charge transport in hematite photocatalysis [29]. Intense SnO 2 peaks from the FTO substrate were also observed for (110), ( 111), (211), and (301) at 26.6, 38.5, 51.8°, and 65.9°respectively indexed according to JCPDS 41-1445 [32].…”

Section: Structural Analysismentioning

confidence: 98%

“…Mott-Schottky results of the seeded hematite NRs photoanodes were plotted as shown in figure 12. The Mott-Schottky plots were used to estimate the flat band potential (V fb ) and donor density (N D ) values of the hematite photoanodes based on equation (5) [29].…”

Section: Mott-schottky Analysismentioning

confidence: 99%

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The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

Talibawo¹,

Nyarige²,

Kyesmen³

et al. 2022

Mater. Res. Express

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Herein we report on the effect of varied spin-coated seed layer concentrations of Iron (III) chloride hexahydrate (FeCl3.6H2O) on the photoelectrochemical performance of hydrothermally synthesized hematite nanorods. The seed layers were prepared from 0.05, 0.07, 0.09, 0.11, and 0.13 M concentrations of FeCl3.6H2O. The nanorods were vertically aligned with slight inclinations over the seed layers with the two lowest molar concentrations (0.05 and 0.07 M) of FeCl3.6H2O. A further increase in seed layer concentrations transformed the nanorods as they grew over others and agglomerated into clusters. Structural analysis using X-ray diffraction (XRD) and Raman spectroscopy demonstrated uniform hematite crystalline peaks for all the samples. All samples absorbed highly in the visible region within an onset absorption edge wavelength ranging from 624 to 675 nm. Overall, the nanorods synthesized over the lowest seed layer concentration of 0.05 M of FeCl3.6H2O exhibited the highest photocurrent density of 0.077 mA/cm2 at 1.5 V vs. reversible hydrogen electrode. The results obtained provide important information about the structural, optical, and photoelectrochemical properties of hematite nanorods synthesized over varied seed layer concentrations. This is a key contribution in understanding and enhancing the hematite nanorods performance for photocatalytic applications.

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Section: Optical Propertiessupporting

confidence: 85%

Section: Structural Analysismentioning

confidence: 57%

“…Along this line, 3. Positive slopes of the Mott-Schottky plots in figure 12 confirm the n-type semiconductor behavior of hematite [29].…”

Section: Mott-schottky Analysismentioning

confidence: 60%

Section: Structural Analysismentioning

confidence: 98%

Section: Mott-schottky Analysismentioning

confidence: 99%

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The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

Talibawo¹,

Nyarige²,

Kyesmen³

et al. 2022

Mater. Res. Express

Self Cite

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The Structural Properties and Photoelectrocatalytic Response of Mn‐Doped Hematite Photoanodes Prepared via a Modified Electrodeposition Approach

Kyesmen,

Simfukwe,

Jubu

et al. 2024

ChemElectroChem

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The concept of nanostructuring and doping of hematite (α‐Fe2O3) photoanodes have been widely engaged towards improving their photoelectrocatalytic (PEC) response. Here, a FeCl3‐based solution was modified with 0–10 % polyethylene glycol (PEG) 400 and used as an electrolyte for the electrodeposition of nanostructured α‐Fe2O3 thin films. The electrolyte containing 10 % PEG was further used to prepare Mn‐doped α‐Fe2O3 films by adding 1, 3, 6, and 10 % of MnCl2.4H2O with respect to the molarity of FeCl3. The addition of 10 % PEG into the electrolyte limited particle agglomeration and yielded the best PEC response among the pristine films. The 3 % Mn‐doped α‐Fe2O3 photoanodes produced the highest photocurrent, yielding 2.2 and 6.1‐fold photocurrent enhancement at 1.23 V and 1.5 V vs. RHE respectively, over the pristine films. The improved PEC response is linked to the reduced particle agglomeration and improved charge transport properties observed for the films. Density functional theory (DFT) calculations of the formation energies yielded negative values for the Mn‐doped α‐Fe2O3, which implies that the materials are thermodynamically stable after doping. This work introduces a new pathway for the electrodeposition of doped α‐Fe2O3 films and underscores the roles of Mn‐doping in boosting their PEC response.

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Photocatalytic properties of molybdenum oxide photoelectrode synthesized by spray pyrolysis method

et al. 2023

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Modified annealing approach for preparing multi-layered hematite thin films for photoelectrochemical water splitting

Cited by 19 publications

References 44 publications

The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers

The Structural Properties and Photoelectrocatalytic Response of Mn‐Doped Hematite Photoanodes Prepared via a Modified Electrodeposition Approach

Photocatalytic properties of molybdenum oxide photoelectrode synthesized by spray pyrolysis method

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