Enhancement of efficiency of solar water splitting based on highly dense hematite single-crystal nanowires

Mahmud, Md Sultan; Arumugam, Sivaranjani; Kimura, Yasuhiro; Toku, Yuhki; Ju, Yang

doi:10.1007/s10853-023-08721-y

Cited by 2 publications

References 32 publications

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Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting

Mahmud,

Gu,

Yoon

et al. 2024

mat express

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Fe2O3 holds promising n-type semiconductor material in the field of solar water splitting due to its excellent photocatalytic properties. However, the photoelectrochemical performance of Fe2O3 is limited by its inherent properties such as poor conductivity, and charge separation efficiency owing to its recombination rate. Therefore, researchers are more focused on nanostructuring, doping, and surface coating to overcome these issues of Fe2O3. In this study, we have investigated a low-cost way to fabricate a Ti coating layer on a high-density Fe2O3 single-crystal nanowire array for solar water splitting. Firstly, we have prepared a high-density single-crystal Fe2O3 nanowire array at lower temperatures by a new approach stress-induced atomic diffusion method. Thereafter, the prepared nanowire array was coated by Ti film using RF sputtering. The optimal film thickness of 13 nm titanium coatings layer into Fe2O3 single crystal nanowire array exhibited a high photocurrent density of 1.36 mA/cm2 at 1.23 V versus RHE and solar to hydrogen conversion efficiency (STH) of 1.67%, which could be resulting from adjusted optoelectronic properties of the nanowires.

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Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting

Mahmud,

Gu,

Yoon

et al. 2024

mat express

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Electrospun fiber membranes of Fe2O3/ZnO with high photocatalytic activity for wastewater treatment application under visible light irradiation

Lin,

Zhang,

Zhang

et al. 2024

Preprint

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Fe2O3/ZnO fiber membranes with a high specific surface area and broadened UV-Vis absorption were successfully fabricated by electrospinning followed by calcination. The diameters of Fe2O3/ZnO fibers are approximately 150 nm, and the specific surface areas of Fe2O3/ZnO fiber membranes are around 29 m2/g. XRD, SEM, and XPS results confirm the formation of a heterojunction between hexagonal ZnO and hematite α-Fe2O3. Compared with pure ZnO fiber membranes, the UV-Vis absorptions of the Fe2O3/ZnO fiber membranes are extended, and transient photocurrent intensities are significantly increased from 0.65 mA/cm2 to 0.86 mA/cm2. The free radical capture experiments further reveal the generation of abundant •OH radicals, which play a crucial role in enhancing the photocatalytic performance of these Fe2O3/ZnO fiber membranes. Optimization studies have determined that the most effective molar ratio of Fe to Zn in the Fe2O3/ZnO heterojunction is 8 mol%, resulting in a 45% increase in photocatalytic degradation efficiency for MB. In addition to this enhanced photocatalytic efficacy, the Fe2O3/ZnO fiber membranes also demonstrate exceptional cycling stability, highlighting their significant potential for application in the photocatalytic treatment of dye wastewater.

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Enhancement of efficiency of solar water splitting based on highly dense hematite single-crystal nanowires

Cited by 2 publications

References 32 publications

Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting

Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting

Electrospun fiber membranes of Fe2O3/ZnO with high photocatalytic activity for wastewater treatment application under visible light irradiation

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Enhancement of efficiency of solar water splitting based on highly dense hematite single-crystal nanowires

Cited by 2 publications

References 32 publications

Titanium-coated high-density Fe2O3 single crystal nanowire array for solar water splitting

Titanium-coated high-density Fe2O3 single crystal nanowire array for solar water splitting

Electrospun fiber membranes of Fe2O3/ZnO with high photocatalytic activity for wastewater treatment application under visible light irradiation

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Product

Resources

About

Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting

Titanium-coated high-density Fe₂O₃ single crystal nanowire array for solar water splitting