Synthesis and characterization of Sn-doped hematite as visible light photocatalyst

Cao, Zhiqin; Qin, Mingli; Gu, Yueru; Jia, Baorui; Chen, Pengqi; Qu, Xuanhui

doi:10.1016/j.materresbull.2016.01.004

Cited by 46 publications

(23 citation statements)

References 40 publications

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“…As expected, the deposition of solutions of Sn 4+ precursor on the hematite electrode surface apparently did not affect the color (red), and only a slight enhancement in the transmittance rate was observed (Figure S2b in the Supporting Information). However, a previous study reported that the addition of Sn 4+ as a dopant enhanced the optical absorption coefficient twofold; this was attributed to structural distortion in the hematite lattice ,…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Ling and Li published a detailed review and found that a substantial improvement in the PEC performance of hematite was primarily promoted by the incorporation of Sn 4+ . However, a complete understanding of the spatial distribution of the Sn 4+ dopant, shifting of the onset potential, and changes caused in the surface state and in the kinetics of charge transfer at the semiconductor–liquid interface in the hematite nanostructure is still unclear and requires further investigation …”

Section: Introductionmentioning

confidence: 99%

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Hematite Surface Activation by Chemical Addition of Tin Oxide Layer

Carvalho

Souza

2016

ChemPhysChem

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In this study, the effect of tin (Sn(4+) ) modification on the surface of hematite electrodes synthesized by an aqueous solution route at different times (2, 5, 10, 18, and 24 h) is investigated. As confirmed from X-ray diffraction results, the as-synthesized electrode exhibits an oxyhydroxide phase, which is converted into a pure hematite phase after being subjected to additional thermal treatment at 750 °C for 30 min. The tin-modified hematite electrode is prepared by depositing a solution of Sn(4+) precursor on the as-synthesized electrode, followed by thermal treatment under the same abovementioned conditions. This modification results in an enhancement of the photocurrent response for all hematite electrodes investigated and attains the highest values of around 1.62 and 2.3 mA cm(-2) at 1.23 and 1.4 V versus RHE, respectively, for electrodes obtained in short synthesis times (2 h). Contact angle measurements suggest that the deposition of Sn(4+) on the hematite electrode provides a more hydrophilic surface, which favors a chemical reaction at the interface between the electrode and electrolyte. This result generates new perspectives for understanding the deposition of Sn(4+) on the hematite electrode surface, which is in contrast with several studies previously reported; these studies state that the enhancement in photocurrent density is related to either the induction of an increased donor charge density or shift in the flat-band potential, which favors charge separation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hematite Surface Activation by Chemical Addition of Tin Oxide Layer

Carvalho

Souza

2016

ChemPhysChem

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“…A subtle reduction from 18 nm down to 14 nm between a-Fe 2 O 3 and the 8% dopant content was found. 33 Then, we tested the OER activity by linear sweep voltammetry (LSV) in 0.1 M KOH solution (pH 13) (see Fig. 2a and S2 †).…”

Section: Preparation and Electrocatalysismentioning

confidence: 99%

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

et al. 2020

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“…Different synthesis methods for various nanostructured α-Fe 2 O 3 , such as combustion [18,19], hydrothermal process [20][21][22], sol-gel [23,24], precipitation [25][26][27], and thermal oxidation, [28][29][30] have already been explored for various applications. Several studies have investigated the utilization of nanostructured α-Fe 2 O 3 for both adsorptive removal and photocatalytic degradation of pollutants [22,23,28,[31][32][33]. As a photocatalyst, however, α-Fe 2 O 3 has several drawbacks including very fast photoexcited state lifetime due to its rapid recombination rate (10 −12 s) [31] and short diffusion length (< 10 nm) [32,34].…”

Section: Introductionmentioning

confidence: 99%

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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Synthesis and characterization of Sn-doped hematite as visible light photocatalyst

Cited by 46 publications

References 40 publications

Hematite Surface Activation by Chemical Addition of Tin Oxide Layer

Hematite Surface Activation by Chemical Addition of Tin Oxide Layer

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

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

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