XANES studies on rhenium L absorption edges of Re2O7 graphite intercalation compounds and of other rhenium-oxygen compounds

Fröba, Michael; Lochte, K.; Metz, W.

doi:10.1016/0022-3697(95)00242-1

Cited by 24 publications

(17 citation statements)

References 49 publications

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“…This is in agreement with theoretical results already reported by Garcia et al at the Mn K edge absorption spectrum of KMnO 4 solution. 20 This is also in good agreement with the experimental results obtained by Froba et al 21 at the Re L 1 absorption edge in HReO 4 . The authors observed a second peak only for the spectra recorded in the solid state.…”

Section: Sensitivity On the Structuresupporting

confidence: 90%

XANES study of rhenium oxide compounds at theL1andL3absorption edges

et al. 2012

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We report on the study of a set of rhenium oxide reference compounds (NH 4 ReO 4 , NaReO 4 ,ReO 3 ,ReO 2 ,and Re 2 O 7) using x-ray-absorption near-edge structure. The parallel use of Re L 1 and L 3 absorption edges permits a concomitant understanding of both the oxidation state and the local symmetry for these compounds. Experiments are compared with ab initio simulations. A good agreement is reached in most cases. The choice of the cluster size and the calculation method (full potential or not), which are mandatory ingredients allowing a satisfactory reproduction of the recorded spectra, is discussed in detail. In the meantime, these parameters give important pieces of information on the studied materials.

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Section: Sensitivity On the Structuresupporting

confidence: 90%

XANES study of rhenium oxide compounds at theL1andL3absorption edges

et al. 2012

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“…Re L 3 -edge XANES spectra collected from the model compounds selected for the present study (Figure 4) match the spectral data published on rhenium oxide compounds, starting with works dated from the seventies [22] to the nineties [19] [20] [23], up to a recent publication [24].…”

Section: Resultssupporting

confidence: 60%

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

Figueiredo¹,

Silva

Veiga³

et al. 2014

JMMCE

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Rhenium is a very scarce element, occurring in the Earth's crust mainly carried by molybdenite (MoS 2 ). Due to a very low availability comparative to actual industrial demand, rhenium is nowadays one of the most expensive mineral commodities and an increased interest is focused on exploring residues resulting from a long-term mining, particularly of sulphide ore deposits. It is therefore noteworthy to assign the presence of rhenium (in a concentration up to 3 ppm) in the waste materials from the old sulphur factory at the abandoned mine of São Domingos (Iberian Pyrite Belt, Southeast Portugal), exploited since the Roman occupation of Iberia. Aiming at a potential sustainable recovery of rhenium as a by-product, X-ray near-edge absorption spectroscopy (XANES) was applied to clarify the Re-binding and mode of occurrence by comparing Re L 3 -edge XANES spectra obtained from mine waste samples (previously fully characterized by X-ray laboratory techniques) with similar spectra collected from Re-rich molybdenites (Mo 1−x Re x S 2 ) and from Re-O model compounds configuring various valences and coordination environments of rhenium ions. Obtained results are commented, ruling out a possible Re-S binding and rather conforming with the binding of rhenium to oxygen in the analysed mine waste materials.

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“…Furthermore, the X‐ray absorption fine structure (XAFS) spectroscopy confirms the existence of selenium vacancies. Generally speaking, the intensity of Re L 3 ‐edge curve from soft X‐ray absorption near‐edge structure (XANES) spectroscopy is mainly depended on the nearest neighbor cation‐anion bond and the number of electrons in the unoccupied state . As the Re L 3 ‐edge XANES spectra shown in Figure g, the obvious difference between the curves of V r ‐ReSe 2 and V p ‐ReSe 2 nanosheets indicates that the structural symmetry in V r ‐ReSe 2 nanosheets has been partially disturbed with decreased coordination number after the incorporation of selenium vacancy.…”

Section: Resultsmentioning

confidence: 99%

N₂ Electroreduction to NH₃ by Selenium Vacancy‐Rich ReSe₂ Catalysis at an Abrupt Interface

Lai

Zong

et al. 2020

Angewandte Chemie

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Vacancy engineering has been proved repeatedly as an adoptable strategy to boost electrocatalysis, while its poor selectivity restricts the usage in nitrogen reduction reaction (NRR) as overwhelming competition from hydrogen evolution reaction (HER). Revealed by density functional theory calculations, the selenium vacancy in ReSe2 crystal can enhance its electroactivity for both NRR and HER by shifting the d‐band from −4.42 to −4.19 eV. To restrict the HER, we report a novel method by burying selenium vacancy‐rich ReSe2@carbonized bacterial cellulose (Vr‐ReSe2@CBC) nanofibers between two CBC layers, leading to boosted Faradaic efficiency of 42.5 % and ammonia yield of 28.3 μg h−1 cm−2 at a potential of −0.25 V on an abrupt interface. As demonstrated by the nitrogen bubble adhesive force, superhydrophilic measurements, and COMSOL Multiphysics simulations, the hydrophobic and porous CBC layers can keep the internal Vr‐ReSe2@CBC nanofibers away from water coverage, leaving more unoccupied active sites for the N2 reduction (especially for the potential determining step of proton‐electron coupling and transferring processes as *NN → *NNH).

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XANES studies on rhenium L absorption edges of Re2O7 graphite intercalation compounds and of other rhenium-oxygen compounds

Cited by 24 publications

References 49 publications

XANES study of rhenium oxide compounds at theL1andL3absorption edges

XANES study of rhenium oxide compounds at theL1andL3absorption edges

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

N₂ Electroreduction to NH₃ by Selenium Vacancy‐Rich ReSe₂ Catalysis at an Abrupt Interface

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XANES studies on rhenium L absorption edges of Re2O7 graphite intercalation compounds and of other rhenium-oxygen compounds

Cited by 24 publications

References 49 publications

XANES study of rhenium oxide compounds at theL1andL3absorption edges

XANES study of rhenium oxide compounds at theL1andL3absorption edges

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

N2 Electroreduction to NH3 by Selenium Vacancy‐Rich ReSe2 Catalysis at an Abrupt Interface

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N₂ Electroreduction to NH₃ by Selenium Vacancy‐Rich ReSe₂ Catalysis at an Abrupt Interface