Design of Hydrothermally Derived Fe<sub>2</sub>O<sub>3</sub> Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

Liang, Yuan‐Chang; Hung, C.‐Y.

doi:10.1021/acsomega.0c02107

Cited by 18 publications

(8 citation statements)

References 54 publications

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“…In TEM measurements (Figure a–d and Figures S2–S7), one can see that all samples roughly retained the octahedral morphology of the starting MIL-101 after thermal annealing, with a lateral length of ca. 600 nm, but exhibited only an amorphous background embedded with nanocrystalline particles up to a few tens of nanometers in size, which featured an interplanar spacing of 0.25 nm that can be ascribed to the (110) planes of Fe 2 O 3 (PDF 33-0664). , This suggests the successful conversion of MIL-101 to nanocrystalline hematite. In addition, no obvious features can be resolved for Pt or PtO x , likely due to the atomic dispersion of Pt within the Fe 2 O 3 scaffold.…”

Section: Resultsmentioning

confidence: 98%

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Nichols

Mayford

et al. 2023

J. Phys. Chem. C

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Metal oxides have been attracting extensive interest in the design and engineering of effective electrocatalysts owing to their unique electronic structure and natural abundance. However, the limited electrical conductivity and sluggish electron-transfer kinetics have hampered their widespread applications. These issues can be mitigated by structural engineering with the incorporation of select precious metal species. Herein, iron oxide nanostructures decorated with platinum species are prepared by the facile thermal annealing of a MIL-101 precursor along with the addition of a controlled amount of PtCl4 and exhibit apparent electrocatalytic activity toward the hydrogen evolution reaction in 0.5 M H2SO4. The best sample needs only an ultralow overpotential of −15 mV to reach the current density of 10 mA cm–2, along with a low Tafel slope of 25.4 mV dec–1, a performance markedly better than that of commercial 20 wt % Pt/C. This is ascribed to the synergistic interactions between the Pt and Fe2O3 scaffold that impact the material’s electrical conductivity and electron-transfer kinetics and the Cl residuals that regulate the adsorption free energy of H, as confirmed in computational studies based on density functional theory. Results from this study highlight the unique potential of metal oxide-based nanocomposites as high-performance, low-cost electrocatalysts for electrochemical energy technologies where the performance can be further regulated by anion residuals.

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Section: Resultsmentioning

confidence: 98%

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Nichols

Mayford

et al. 2023

J. Phys. Chem. C

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“…The possible cause of this spike transient feature is associated with the recombination of the photoinduced electrons and holes at the surface states of the oxides. 39,40 The maximum steady-state photocurrent density value achieved by the Bi 2 O 3 photoelectrodes under irradiation follows the order:…”

Section: Resultsmentioning

confidence: 99%

Improved photoelectrode performance of chemical solution-derived Bi₂O₃ crystals via manipulation of crystal characterization

Liang

Chou

2020

RSC Adv.

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“…This is motivated and expected because of the suitable band alignment between the Fe 2 O 3 and ZnO. [ 161 ]…”

Section: Junctionsmentioning

confidence: 99%

Nanoscale ZnO/α‐Fe₂O₃ Heterostructures: Toward Efficient and Low‐Cost Photoanodes for Water Splitting

et al. 2021

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Composite metal oxide semiconductors are promising candidates for photoelectrochemical water splitting (PEC WS) toward environmentally friendly hydrogen production. Among them, ZnO and α‐Fe2O3 hold great potential thanks to a series of benefits, including fast charge transport in single‐crystalline structures, large surface area and tunable shapes (ZnO), and energy bandgap falling in the visible spectral range (α‐Fe2O3). However, both materials present significant drawbacks, which hinder their successful application in high‐efficiency PEC WS: the wide bandgap of ZnO limits its absorption in the UV range, while the low charge carrier mobility results in heavy recombination losses in α‐Fe2O3 during charge collection. The synthesis of ZnO/hematite composites has recently proven to be an effective approach to improve the overall WS performances. In this review, the recent developments on the application of different morphologies (0D, 1D, 2D, and 3D structures) for PEC WS are illustrated, analyzing the role of the shape and morphology in boosting the functional properties, both in single systems and in composite nanostructures. Complex networks show higher photocatalytic efficiency than the single building blocks and, consequently, composite materials exhibit higher performances. Possible paths for the development of an effective lab‐to‐fab transition based on application of ZnO/α‐Fe2O3 composite structures are also suggested.

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Design of Hydrothermally Derived Fe₂O₃ Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

Cited by 18 publications

References 54 publications

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Improved photoelectrode performance of chemical solution-derived Bi₂O₃ crystals via manipulation of crystal characterization

Nanoscale ZnO/α‐Fe₂O₃ Heterostructures: Toward Efficient and Low‐Cost Photoanodes for Water Splitting

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Design of Hydrothermally Derived Fe2O3 Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

Cited by 18 publications

References 54 publications

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Platinum-Anchored Iron Oxide Nanostructures for Efficient Hydrogen Evolution Reaction in Acidic Media

Improved photoelectrode performance of chemical solution-derived Bi2O3 crystals via manipulation of crystal characterization

Nanoscale ZnO/α‐Fe2O3 Heterostructures: Toward Efficient and Low‐Cost Photoanodes for Water Splitting

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Product

Resources

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Design of Hydrothermally Derived Fe₂O₃ Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

Improved photoelectrode performance of chemical solution-derived Bi₂O₃ crystals via manipulation of crystal characterization

Nanoscale ZnO/α‐Fe₂O₃ Heterostructures: Toward Efficient and Low‐Cost Photoanodes for Water Splitting