Photocatalytic activity of Fe-modified bismuth titanate pyrochlores: Insights into its stability, photoelectrochemical, and optical responses

Ragsdale, William; Gupta, Satyajit; Conard, Keenan; DelaCruz, Steven; Subramanian, Vaidyanathan

doi:10.1016/j.apcatb.2015.06.016

Cited by 22 publications

(7 citation statements)

References 58 publications

(65 reference statements)

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“…This surge in energy consumption may be responsible for the energy crisis . Currently, energy consumption relies on conventional energy resources such as coal, natural gas, waste, biomass, sun, wind, hydropower, nuclear power, and geothermal power. − However, these resources are limited and lead to increasing global warming-related issues. − Therefore, researchers have been attracted toward the design and development of energy-related devices and techniques such as solar cells, energy storage devices, batteries, and supercapacitors …”

Section: Introductionmentioning

confidence: 99%

“…6−9 Therefore, researchers have been attracted toward the design and development of energy-related devices and techniques such as solar cells, energy storage devices, batteries, and supercapacitors. 7 Hydrogen (H 2 ) evolution or production has received enormous attention because of its eco-friendly nature and cost-effectiveness. 10,11 In particular, photocatalytic H 2 production has been considered the most efficient technique to produce H 2 .…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Synthesis of a Magnesium Vanadate-Functionalized Reduced Graphene Oxide Nanocomposite for an Efficient Photocatalytic Hydrogen Production

et al. 2023

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Herein, we reported the fabrication of a magnesium vanadate-reduced graphene oxide (Mg 3 V 2 O 8 -rGO) composite. Further, the structural morphology of the as-prepared Mg 3 V 2 O 8 -rGO composite was studied by scanning electron microscopy. Powder X-ray diffraction and energy-dispersive X-ray spectroscopy techniques were also adopted to check the phase purity and elemental composition of the prepared Mg 3 V 2 O 8 -rGO composite. Mg 3 V 2 O 8 -rGO possesses a band gap of 2.98 eV, which prompted us to explore its photocatalytic activity for hydrogen (H 2 ) evolution reaction. The Mg 3 V 2 O 8 -rGO composite demonstrated the generation of a reasonable amount of H 2 evolution (97.45 μmol g −1 ), which is relatively higher than that of pristine Mg 3 V 2 O 8 (17.45 μmol g −1 ). This may be attributed to the presence of synergism between Mg 3 V 2 O 8 and rGO. In addition, Mg 3 V 2 O 8 -rGO also showed good stability and suggested its potential application for photocatalytic H 2 evolution applications. So far, no report is available on the use of Mg 3 V 2 O 8 -rGO as a photocatalyst for H 2 evolution. We propose the potential role of the Mg 3 V 2 O 8 -rGO composite for photocatalytic H 2 evolution applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of a Magnesium Vanadate-Functionalized Reduced Graphene Oxide Nanocomposite for an Efficient Photocatalytic Hydrogen Production

et al. 2023

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“…In a related study, Ragsdale et al [55] have shown that some multi-metal oxides offer a bandgap tunability option, we refer to these compounds as bandgap engineered composite oxide nanostructures or BECONs. Adding additional metal elements (Fe, Mn, Co, or Ni) into the structure of BECONs can promote their photoactivity and adding occur in the preparation process of BECONs (not including doping).…”

Section: Effect Of Laminate Composition and Structurementioning

confidence: 98%

Structural characteristics and spectral response of composite transition metal oxide photocatalytic materials

Zhang

Liu

et al. 2016

J Mater Sci

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Layered composite materials formed by the transition metal oxides, including the niobates, titanates, titanoniobates, and tantalates, have been studied as a kind of new photocatalytic materials because of their unique structures and properties. Their photocatalytic performance could be modified by adjusting the laminate composition, selecting appropriate phase structure, exchanging interlayer cations or intercalated-pillaring, exfoliated-assembling, etc. The purpose of this present paper is to review the main factors affecting photocatalytic performance of the layered composite transition metal oxides and to provide reference for further construction of new photocatalytic materials.

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“…Nanosized compounds of stoichiometric and Bi-deficient bismuth titanate with a pyrochlore-type structure and their solid solutions are currently being studied as promising photocatalytic active materials in the visible region. − Important factors that provide photocatalytic and optical properties are the crystal and electronic structures, defectiveness, cationic distribution, and local interatomic interactions. , It could be expected that the microstructural characteristics of the compounds depend on the methods and conditions of their synthesis …”

Section: Introductionmentioning

confidence: 99%

“…An experimental study of Fe-doped Bi 2 Ti 2 O 7 mainly involved a photocatalyst preparation and its performance. − , Doping with iron reduces the band gap resulting in a shift in the absorption spectra toward higher wavelengths. The authors concluded that bismuth titanate pyrochlores doped with iron are promising as photocatalytic active materials in the visible range.…”

Section: Introductionmentioning

confidence: 99%

Structure and Magnetic Properties of a Nanosized Iron-Doped Bismuth Titanate Pyrochlore

et al. 2022

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The nanosized (50–70 nm) pyrochlore Bi1.5Fe0.5Ti2O7−δ was prepared by a coprecipitation technique. Characterization of Bi1.5Fe0.5Ti2O7−δ was carried out by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Raman spectroscopy, Mössbauer spectroscopy, and magnetic susceptibility measurements. The study of Fe doping in Bi2Ti2O7 was performed by means of density functional theory (DFT) calculations. The nanosized Bi1.5Fe0.5Ti2O7−δ sample crystallizes in the structural type of pyrochlore (Fd3̅m). The distribution of Fe atoms over the sites of Bi and Ti was studied from DFT simulations and then confirmed by the XRD analysis and Mössbauer method. The local distribution, electronic structure, and magnetic behavior of nanosized Bi1.5Fe0.5Ti2O7−δ are determined by the local microstructure of the metastable nanosized sample. Based on the examination of the Mössbauer spectrum of the Bi1.5Fe0.5Ti2O7−δ nanopowder, the following states of oxidation were revealed for iron atoms: Fe4+ in the titanium sites with a fraction of ∼5.7% and two states of Fe3+ (in the Bi and Ti sites) with different geometries of the oxygen surrounding. The ratio of Fe3+ distributed over the sites correlates well with the distribution in the ceramic sample. The presence of Fe4+ was found only in the nanosized Bi1.5Fe0.5Ti2O7−δ. The experimental effective magnetic moment of Fe atoms in the nanosized Bi1.5Fe0.5Ti2O7−δ appeared noticeably lower than that in the ceramic sample. The temperature dependence of μeff within the temperature range of 50–300 K is adequately described by the model of coexistence of Fe3+ and Fe4+ and the existence of clusters.

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Photocatalytic activity of Fe-modified bismuth titanate pyrochlores: Insights into its stability, photoelectrochemical, and optical responses

Cited by 22 publications

References 58 publications

Hydrothermal Synthesis of a Magnesium Vanadate-Functionalized Reduced Graphene Oxide Nanocomposite for an Efficient Photocatalytic Hydrogen Production

Hydrothermal Synthesis of a Magnesium Vanadate-Functionalized Reduced Graphene Oxide Nanocomposite for an Efficient Photocatalytic Hydrogen Production

Structural characteristics and spectral response of composite transition metal oxide photocatalytic materials

Structure and Magnetic Properties of a Nanosized Iron-Doped Bismuth Titanate Pyrochlore

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