High oxide ion conductivity in Bi2MoO6 oxidation catalyst

doi:10.1039/b106792n

Cited by 52 publications

(12 citation statements)

References 14 publications

(16 reference statements)

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“…Bismuth molybdate, Bi 2 MoO 6 (BMO), from this group is composed of alternating (Bi 2 O 2 ) 2+ and (MoO 4 ) 2 – layers, stacked along the b -axis of the unit cell. This layered structure, apart from being conducive to oxide ion mobility, also confers a narrow band gap that can be extended to 500 nm . Nanoparticles of BMO have been studied for catalytic, − gas sensing, , photocatalytic − and supercapacitor applications .…”

Section: Introductionmentioning

confidence: 99%

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Jatav¹,

Liu²,

Herber³

et al. 2021

ACS Appl. Mater. Interfaces

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Certain nanomaterials can filter and alter unwanted compounds due to a high surface area, surface reactivity, and microporous structure. Herein, γ-Bi2MoO6 particles are synthesized via a colloidal hydrothermal approach using organically modified Laponite as a template. This organically modified Laponite interlayer serves as a template promoting the growth of the bismuth molybdate crystals in the [010] direction to result in hybrid Laponite–Bi2MoO6 particles terminating predominantly in the {100} crystal facets. This resulted in an increase in particle size from lateral dimensions of <100 nm to micron scale and superior adsorption capacity compared to bismuth molybdate nanoparticles. These {100}-facet terminated particles can load both cationic and anionic dyes on their surfaces near-spontaneously and retain the photocatalytic properties of Bi2MoO6. Furthermore, dye-laden hybrid particles quickly sediment, rendering the task of particle recovery trivial. The adsorption of dyes is completed within minutes, and near-complete photocatalytic degradation of the adsorbed dye in visible light allowed recycling of these particles for multiple cycles of water decontamination. Their adsorption capacity, facile synthesis, good recycling performance, and increased product yield compared to pure bismuth molybdate make them promising materials for environmental remediation. Furthermore, this synthetic approach could be exploited for facet engineering in other Aurivillius-type perovskites and potentially other materials.

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Section: Introductionmentioning

confidence: 99%

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Jatav¹,

Liu²,

Herber³

et al. 2021

ACS Appl. Mater. Interfaces

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“…Here, we study CeO 2 –STO (STO = SrTiO 3 ) VAN films; these , and related films have been shown to have greatly enhanced oxide-ion conductivity, which is a key property for technologies such as solid oxide fuel cells, catalysts, and ion switches, but the mechanism that gives rise to this increased conductivity remains unclear. Scanning transmission electron microscopy (STEM) images (reproduced in Figure a) of Sm-doped-CeO 2 –STO VAN films, grown using the same procedure as the CeO 2 –STO VAN films studied in this work, show nanopillars of around 20–30 nm in diameter embedded in an STO matrix.…”

mentioning

confidence: 99%

“…Here, we study CeO 2 −STO (STO = SrTiO 3 ) VAN films; these 17,18 and related films 24 have been shown to have greatly enhanced oxide-ion conductivity, which is a key property for technologies such as solid oxide fuel cells, 25 catalysts, 26 and ion switches, 27 but the mechanism that gives rise to this increased conductivity remains unclear. Scanning transmission electron microscopy (STEM) images (reproduced in Figure 1a) of Smdoped-CeO 2 −STO VAN films, grown using the same procedure as the CeO 2 −STO VAN phases is dictated by the epitaxy on the STO substrate and two major types of interface can be distinguished: CeO 2 (110)/ STO(100), referred to as the 0°interface, and CeO 2 (100)/ STO(110), referred to as the 45°interface, in a ratio of ∼3:1; there are also some more poorly defined, rounded, interfaces, and steps, which complicate the analysis (see Supporting Information Note 1 for quantification of the interfaces).…”

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confidence: 99%

Revealing the Structure and Oxygen Transport at Interfaces in Complex Oxide Heterostructures via ¹⁷O NMR Spectroscopy

et al. 2020

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Vertically aligned nanocomposite (VAN) films, comprising nanopillars of one phase embedded in a matrix of another, have shown great promise for a range of applications due to their high interfacial areas oriented perpendicular to the substrate. In particular, oxide VANs show enhanced oxide-ion conductivity in directions that are orthogonal to those found in more conventional thin-film heterostructures; however, the structure of the interfaces and its influence on conductivity remain unclear. In this work, 17 O NMR spectroscopy is used to study CeO 2 –SrTiO 3 VAN thin films: selective isotopic enrichment is combined with a lift-off technique to remove the substrate, facilitating detection of the 17 O NMR signal from single atomic layer interfaces. By performing the isotopic enrichment at variable temperatures, the superior oxide-ion conductivity of the VAN films compared to the bulk materials is shown to arise from enhanced oxygen mobility at this interface; oxygen motion at the interface is further identified from 17 O relaxometry experiments. The structure of this interface is solved by calculating the NMR parameters using density functional theory combined with random structure searching, allowing the chemistry underpinning the enhanced oxide-ion transport to be proposed. Finally, a comparison is made with 1% Gd-doped CeO 2 –SrTiO 3 VAN films, for which greater NMR signal can be obtained due to paramagnetic relaxation enhancement, while the relative oxide-ion conductivities of the phases remain similar. These results highlight the information that can be obtained on interfacial structure and dynamics with solid-state NMR spectroscopy, in this and other nanostructured systems, our methodology being generally applicable to overcome sensitivity limitations in thin-film studies.

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“…In terms of activity and selective oxidation, -Bi 2 Mo 2 O 9 phase is the best catalyst [12] and, however, at high temperatures is the most unstable, which delimits its use in applications such as automobile emission control. Besides, transition metal oxides (TMO) and metal oxidebased catalysts are frequently used in the oxidation of carbon monoxide [13], in contrast with Bi-Mo system. -Bi 2 MoO 6 forms three polymorphic forms named as follows: (L) (lowtemperature phase), (I) (intermediate-temperature phase), and (H) (high-temperature phase) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of both low- and high-temperature $$\gamma $$-$${\text {Bi}}_{2}{\text {MoO}}_{6}$$ crystalline phases

et al. 2020

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In order to understand the electronic properties that (L)-Bi 2 MoO 6 and (H)-Bi 2 MoO 6 crystalline phases present, theoretical calculations were performed under the density functional theory (DFT) method. The computed PDOS for both phases shows that although these present a difference in bandgap values (larger for (H)-Bi 2 MoO 6 phase), the same type of orbitals is found at the HOMO and LUMO levels. The Löwdin charge values obtained from a population analysis suggest that the (H)-Bi 2 MoO 6 phase presents a larger number of both acid and basic sites at the free surface. We also observe that the occupation degree of the valence orbitals in this phase is greater than that in the (L)-Bi 2 MoO 6 phase.

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High oxide ion conductivity in Bi2MoO6 oxidation catalyst

Cited by 52 publications

References 14 publications

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Revealing the Structure and Oxygen Transport at Interfaces in Complex Oxide Heterostructures via ¹⁷O NMR Spectroscopy

Theoretical study of both low- and high-temperature $$\gamma $$-$${\text {Bi}}_{2}{\text {MoO}}_{6}$$ crystalline phases

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High oxide ion conductivity in Bi2MoO6 oxidation catalyst

Cited by 52 publications

References 14 publications

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Revealing the Structure and Oxygen Transport at Interfaces in Complex Oxide Heterostructures via 17O NMR Spectroscopy

Theoretical study of both low- and high-temperature $$\gamma $$-$${\text {Bi}}_{2}{\text {MoO}}_{6}$$ crystalline phases

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Revealing the Structure and Oxygen Transport at Interfaces in Complex Oxide Heterostructures via ¹⁷O NMR Spectroscopy