Facile preparation of Zn-doped hematite thin film as photocathode for solar hydrogen generation

Chen, Ying-Chu; Kuo, Chun-Lin; Hsu, Yu‐Kuei

doi:10.1016/j.jallcom.2018.07.315

Cited by 24 publications

(14 citation statements)

References 19 publications

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“…4b. Raman peaks at 223 and 496 cm −1 are assigned to the A 1g mode of α-Fe 2 O 3 , while the peaks at 244, 290, 404, and 610 cm −1 are attributed to the E g mode of α-Fe 2 O 3 [37,43,44]. All samples exhibit the same vibration pattern, specific only to α-Fe 2 O 3 , which suggests that it is the dominant phase at the surface of the samples.…”

Section: Effect Of Zn Doping On the Morphology And Structure Of α-Fe mentioning

confidence: 90%

“…Hence, extending separation lifetime of the photogenerated charge carriers is not the enhancing effect of Zn. Doping α-Fe 2 O 3 with Zn 2+ has been reported elsewhere to cause faster interfacial charge transfer as compared to pure α-Fe 2 O 3 [37,64]. The low interfacial charge transfer resistance is critical in the reaction rate of the Fenton reaction (Reaction 8) since an electron has to transfer from Fe 2+ to the adsorbed H 2 O 2 [65].…”

Section: Adsorptive Removal Of Cr(vi) By α-Fe 2 O 3 Nanobladesmentioning

confidence: 96%

“…5b. This peak is assigned to the E u longitudinal optical (LO) mode that is attributed to structural defects brought about by Zn doping [37,[43][44][45].…”

Section: Effect Of Zn Doping On the Morphology And Structure Of α-Fe mentioning

confidence: 99%

“…The amount of Zn 2+ was also found to influence the size of resulting α-Fe 2 O 3 microcubes. α-Fe 2 O 3 thin films, on the other hand, were fabricated by Chen et al [37] via spin coating and consequent thermal treatment for hydrogen production. Incorporation of dopant rendered the naturally n-type α-Fe 2 O 3 to a p-type semiconductor and extended its absorption edge to enhance its photoactivity.…”

Section: Introductionmentioning

confidence: 99%

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Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Aquino

Balela

2020

SN Appl. Sci.

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This work presents a facile method of growing zinc-doped α-hematite (Zn-doped α-Fe 2 O 3) nanostructures via thermal oxidation of Fe sheet in the presence of Zn 2+ mist. Both undoped and Zn-doped α-Fe 2 O 3 nanostructures exhibit blade-like morphology mixed with some nanowires. In general, smaller yet denser nanostructures are formed at higher oxidation temperatures. On the other hand, misting (water vapor) enhances the oxidation rate, leading to larger nanoblades. Raman and energy dispersive X-ray spectroscopy reveal the successful incorporation of Zn in the α-Fe 2 O 3 lattice. However, excessive Zn 2+ (0.01 M) promotes the formation of large Zn hydroxide chloride particles on top of the α-Fe 2 O 3 nanoblades. The undoped α-Fe 2 O 3 nanostructures prepared at 650 °C in water vapor effectively adsorb hexavalent chromium [Cr(VI)] in aqueous solution with about 95% removal efficiency. The sample oxidized in 0.005 M Zn 2+ mist is also efficient in the Fenton-assisted photodegradation of methyl orange with > 90% removal even after five degradation cycles.

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Section: Effect Of Zn Doping On the Morphology And Structure Of α-Fe mentioning

confidence: 90%

Section: Adsorptive Removal Of Cr(vi) By α-Fe 2 O 3 Nanobladesmentioning

confidence: 96%

“…5b. This peak is assigned to the E u longitudinal optical (LO) mode that is attributed to structural defects brought about by Zn doping [37,[43][44][45].…”

Section: Effect Of Zn Doping On the Morphology And Structure Of α-Fe mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Aquino

Balela

2020

SN Appl. Sci.

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“…Zn 2+ doping, for instance, transforms the weakly n-type hematite into a p-type semiconductor, as required for a successful photocathode. 26,27 In comparison, Zn doping should be detrimental in the case of a photoanode. Interestingly, very recent studies have reported that, although anodic photocurrent decreases upon Zn doping when compared with a more suitable n-type dopant, 28 Zn doping results in a signicant decrease in the OER onset overpotential, even in the dark.…”

Section: Introductionmentioning

confidence: 99%

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

et al. 2020

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Defect‐Cluster‐Boosted Solar Photoelectrochemical Water Splitting by n‐Cu₂O Thin Films Prepared Through Anisotropic Crystal Growth

Chen

Popescu

et al. 2019

ChemSusChem

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Anisotropic growth of Cu2O crystals deposited on an indium‐doped tin oxide‐coated glass substrate through facile electrodeposition and low‐temperature calcination results in favorable solar photoelectrochemical water splitting. XRD, TEM, and SEM reveal that appreciable oxygen vacancies are populated in the Cu2O crystals with a highly branched dendritic thin film morphology, which are further substituted by Cu atoms to form Cu antisite defects exclusively along the [111] direction. The post‐thermal treatment presumably accelerates such migration of the lattice imperfections, favoring the exposure of the catalytically active (111) facets. The Cu2O thin film derived in this way shows n‐type conduction with a donor concentration in the order of 1017 cm−3 and a flat‐band potential of −1.19 V vs. Ag/AgCl, which is also confirmed by Mott–Schottky analysis. The material is employed as a photoanode and delivers a photocurrent density of 2.2 mA cm−2 at a potential of 0.3 V vs. Ag/AgCl, surpassing reported values more than twofold. Such superiority mostly originates from the synergism of the selective facet exposure within the Cu2O crystals, which have decent crystallinity, as shown by Raman and photoluminescence spectroscopy, and a favorable bandgap of 2.1 eV, as confirmed by UV/Vis spectroscopy. The n‐type Cu2O thin film reported herein holds excellent promise for solar‐related applications.

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Facile preparation of Zn-doped hematite thin film as photocathode for solar hydrogen generation

Cited by 24 publications

References 19 publications

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

Defect‐Cluster‐Boosted Solar Photoelectrochemical Water Splitting by n‐Cu₂O Thin Films Prepared Through Anisotropic Crystal Growth

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Facile preparation of Zn-doped hematite thin film as photocathode for solar hydrogen generation

Cited by 24 publications

References 19 publications

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

Defect‐Cluster‐Boosted Solar Photoelectrochemical Water Splitting by n‐Cu2O Thin Films Prepared Through Anisotropic Crystal Growth

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Product

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Defect‐Cluster‐Boosted Solar Photoelectrochemical Water Splitting by n‐Cu₂O Thin Films Prepared Through Anisotropic Crystal Growth