Zn-doped hematite modified by graphene-like WS2: A p-type semiconductor hybrid photocathode for water splitting to produce hydrogen

Chu, Dongmei; Li, Kezhen; Liu, Aijuan; Huang, Jie; Zhang, Chunyong; Yang, Ping; Du, Yukou; Lü, Cheng

doi:10.1016/j.ijhydene.2018.02.152

Cited by 26 publications

(8 citation statements)

References 60 publications

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“…Our prepared FeOSnS2 heterocatalyst presents better performance than previously reported photocatalysts consisting of α-Fe 2 O 3 modified with other metal sulfides. For example, Lu et al reported an HE rate of 6.9 μmol/g/h over Zn-doped α-Fe 2 O 3 -modified WS 2 after 2 h solar light irradiation . Kadam et al reported the highest HE rate of 136 μmol/g/h for a 10% Mo-doped SnS photocatalyst at 400 nm .…”

Section: Resultsmentioning

confidence: 99%

“…For example, Lu et al reported an HE rate of 6.9 μmol/g/h over Zn-doped α-Fe 2 O 3 -modified WS 2 after 2 h solar light irradiation. 63 Kadam et al reported the highest HE rate of 136 μmol/g/h for a 10% Mo-doped SnS photocatalyst at 400 nm. 64 When PdO x species were loaded as cocatalysts on FeOSnS2, H 2 formation yield was increased from 702 μmol/g for FeOSnS2 to 821 μmol/g for FeOSnS2-PdO x 1% and 1444 μmol/g for FeOSnS2-PdO x 2% after 3.5 h of illumination.…”

Section: Resultsmentioning

confidence: 99%

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Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

et al. 2022

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In the quest for optimal H 2 evolution (HE) through ethanol photoreforming, a dual cocatalyst-modified heterocatalyst strategy is utilized. Tin(II) sulfide (SnS) was hybridized with α-Fe 2 O 3 to form the heterocatalyst FeOSnS with a p−n heterojunction structure as confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV−vis diffusive reflectance spectroscopy (UV− vis DRS), and Brunauer−Emmett−Teller (BET) techniques. PdO x and PdO x /MnO x cocatalysts were loaded onto the FeOSnS heterocatalyst through the impregnation method, as verified by high-resolution transform electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and elemental mapping. Photocatalytic ethanol photoreforming resulted in the production of H 2 as the main product with a selectivity of 99% and some trace amounts of CH 4 . The FeOSnS2-PdO x 2%/MnO x 1% photocatalyst achieved the highest HE rate of 1654 μmol/g, attributed to the synergistic redox contribution of the PdO x and MnO x species.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

et al. 2022

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“…In particular, Zn-doping has been employed by previous studies to improve the electronic properties of α-Fe 2 O 3 . Chu et al [35] hydrothermally synthesized spindle-like, Zn-doped α-Fe 2 O 3 nanostructures. It was further modified with tungsten sulfide (WS 2 ) and were used as hybrid photocathode for hydrogen production.…”

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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“…The increasing demand for energy and the high population growth have caused a number of environmental problems, which require the development of new technologies for reducing emissions and replacing non‐renewable fuels 1,2 . The hydrogen production by photoelectrochemical processes with semiconductors, such as TiO 2 , WO 3 , ZnO, and α‐Fe 2 O 3 has been considered one of the most promising technologies for the supply of clean and sustainable energy 3 . These processes use photoelectrochemical cells (PEC) which allow the conversion of solar energy into chemical energy mainly via fragmentation of the water molecule 4,5 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of hydrogen production by molecular fragmentation of water and ammonia using the αFe_2‐xM_xO₃ (M = Co, Ni, Cu, or Zn) as photoanodes

Melo

Silva

Pereira

et al. 2020

Env Prog and Sustain Energy

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Hydrogen production from water splitting is a widely used technique and hematite is one of the most used semiconductors in these processes due to its favorable characteristics such as: adequate band gap, visible light absorption, high chemical stability, abundance in nature, among others. Research on hydrogen fuel production from ammonia instead of water is still very limited. Ammonia is a contaminant normally found in wastewater and annualy tons of ammonia or effluents containing this contaminant are thrown into the environment, making it an ideal reagent to produce hydrogen in a clean environmental process. Based on this knowledge, this work proposes the comparison of the photoelectrochemical performance of hematite doped with structural cations (zinc, copper, cobalt, and nickel) in the molecular fragmentation of water and ammonia to produce hydrogen. A structural characterization of the materials used and tests for PEC activity were performed. Pure hematite doped with ammonia as a substrate presented higher electrical current and it was not activated by visible light. When under visible light hematite‐Co presented a discrete increase in the electrical current and, consequently, a small increase in the hydrogen production from water, whereas in the tests with ammonia, the copper‐doped hematite was responsible for a slight increase in the electrical current.

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Zn-doped hematite modified by graphene-like WS2: A p-type semiconductor hybrid photocathode for water splitting to produce hydrogen

Cited by 26 publications

References 60 publications

Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

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

Evaluation of hydrogen production by molecular fragmentation of water and ammonia using the αFe_2‐xM_xO₃ (M = Co, Ni, Cu, or Zn) as photoanodes

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Zn-doped hematite modified by graphene-like WS2: A p-type semiconductor hybrid photocathode for water splitting to produce hydrogen

Cited by 26 publications

References 60 publications

Synergistic Effect of Redox Dual PdOx/MnOx Cocatalysts on the Enhanced H2 Production Potential of a SnS/α-Fe2O3 Heterojunction via Ethanol Photoreforming

Synergistic Effect of Redox Dual PdOx/MnOx Cocatalysts on the Enhanced H2 Production Potential of a SnS/α-Fe2O3 Heterojunction via Ethanol Photoreforming

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

Evaluation of hydrogen production by molecular fragmentation of water and ammonia using the αFe2‐xMxO3 (M = Co, Ni, Cu, or Zn) as photoanodes

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Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

Synergistic Effect of Redox Dual PdO_x/MnO_x Cocatalysts on the Enhanced H₂ Production Potential of a SnS/α-Fe₂O₃ Heterojunction via Ethanol Photoreforming

Evaluation of hydrogen production by molecular fragmentation of water and ammonia using the αFe_2‐xM_xO₃ (M = Co, Ni, Cu, or Zn) as photoanodes