Hybridized orbital states in spin-orbit coupled 
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 double perovskites studied by x-ray absorption spectroscopy

Lee, Min-Cheol; Lee, Sang‐Hyun; Won, Choongjae; Lee, K. D.; Hur, N.; Chen, Jeng-Lung; Cho, Deok‐Yong; Noh, Tae Won

doi:10.1103/physrevb.97.125123

Cited by 22 publications

(13 citation statements)

References 35 publications

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“…The observed higher intensity of Pt L 3 -edge white line compared to the Pt foil reference as well as a new prepeak (11530~11550 eV) appeared in advance for the SAs Pt-Au/R-TNTs, revealed that atomic Pt in the SAs Pt-Au/R-TNTs was positively charged. Further, the new prepeak should be attributed to the transition of hybridization between Pt 5d and O 2p orbitals 30 , therefore, the Pt species should exist as compounds. As far as the normalized Ti Kedge XANES (Fig.…”

Section: Interaction Between Metals and Supportmentioning

confidence: 99%

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Pan

Wang

Xiong

et al. 2021

Environmental Research

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A binary component catalyst consists of single atoms (SAs-Pt and Au) anchored on self-doped TiO 2 nanotubes (TNTs), was developed for photocatalytic CO 2 reduction. The defects introduced TNTs substrate was stabilized with atomic Pt and Au via strong metal support interactions (MSI), due to which, the covalent interactions of Pt-O and Au-Ti facilitated an effective transfer of photo-generated electrons from the defective sites to the SAs, and in turn an enhanced separation of electron-hole pairs and charge-carrier transmission. The Pt-Au/R-TNTs with 0.33 wt% of SA metals, exhibited a maximum of 149 times higher photocatalytic performance than unmodi ed R-TNT and a total apparent quantum yield (AQY) of 17.9%, in which the yield of CH 4 and C 2 H 6 reached to 360.0 and 28.8 µmol g − 1 h − 1 , respectively.The metals loading shifted the oxidation path of H 2 O from •OH generation into O 2 evolution, that inhibited the self-oxidization of the photocatalyst.

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Section: Interaction Between Metals and Supportmentioning

confidence: 99%

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Pan

Wang

Xiong

et al. 2021

Environmental Research

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“…It was shown in our previous reports 18,19 that the oxidation number of Pt is +4, whereas that of Co is +2 in La 2 CoPtO 6 . Because the total spin of Pt 5d electrons should be null, only the spin interaction between the Co 2+ ions can dominate the magnetic ordering.…”

Section: Introductionmentioning

confidence: 68%

“…It is observed in the XRD and ND data that a small amount of Pt (<3%) were segregated. However, the average valence of Pt is 4 + predominantly, 19 suggesting that the segregation effects hardly alter the chemistry or crystal structure of main double perovskite.…”

Section: Experimental/materials and Methodsmentioning

confidence: 99%

Crystal and Magnetic Structures of La₂CoPtO₆ Double Perovskite

Lee¹,

Lee

Ishikawa³

et al. 2018

ACS Omega

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We investigated the crystal structure and magnetic structure in cobaltite-platinate double perovskite of La 2 CoPtO 6 , employing various techniques of X-ray diffraction, neutron diffraction, and the extended X-ray absorption fine structure analysis. It is shown that the crystal symmetry is maintained as P 2 1 / n in the temperature range of <500 °C, whereas the lattice constants and the Co–Co distances undergo a continuous structural evolution toward the high-symmetry phases with increasing temperature. The Co–O bonds were overall longer and had a larger degree of structural and thermal disorders than the Pt–O bonds. As for the magnetism, an antiferromagnetic order is stabilized in the Co 2+ sublattice at temperatures below 28 K. It is demonstrated that owing to the substantial distortions (quantified by a distortion parameter Σ > 0.03 Å) of the Co–Co networks, the system is not subject to spin frustration effect. Details in the magnetic structure are determined; at 12 K, the Co magnetic moment was (0.8, 0, 2.7) Bohr magneton, the magnetic propagation vector was (−0.5, 0, 0.5), and the magnetic symmetry was preferably Γ 1 (A g ).

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“…and O 2p orbitals 30 , therefore, the Pt species should exist as compounds. As far as the normalized Ti Kedge XANES ( Fig.…”

Section: Interaction Between Metals and Supportmentioning

confidence: 99%

Enhanced Photocatalytic CO2 Reduction with Defective TiO2 Nanotubes Modified by Single-Atom Binary Metal Components

Pan

Wang

Xiong

et al. 2020

Preprint

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A binary component catalyst consists of single atoms (SAs- Pt and Au) anchored on self-doped TiO2 nanotubes (TNTs), was developed for photocatalytic CO2 reduction. The defects introduced TNTs substrate was stabilized with atomic Pt and Au via strong metal support interactions (MSI), due to which, the covalent interactions of Pt-O and Au-Ti facilitated an effective transfer of photo-generated electrons from the defective sites to the SAs, and in turn an enhanced separation of electron–hole pairs and charge-carrier transmission. The Pt-Au/R-TNTs with 0.33 wt% of SA metals, exhibited a maximum of 149 times higher photocatalytic performance than unmodified R-TNT and a total apparent quantum yield (AQY) of 17.9%, in which the yield of CH4 and C2H6 reached to 360.0 and 28.8 µmol g− 1 h− 1, respectively. The metals loading shifted the oxidation path of H2O from •OH generation into O2 evolution, that inhibited the self-oxidization of the photocatalyst.

show abstract

Hybridized orbital states in spin-orbit coupled 3d−5d double perovskites studied by x-ray absorption spectroscopy

Cited by 22 publications

References 35 publications

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Crystal and Magnetic Structures of La₂CoPtO₆ Double Perovskite

Enhanced Photocatalytic CO2 Reduction with Defective TiO2 Nanotubes Modified by Single-Atom Binary Metal Components

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Hybridized orbital states in spin-orbit coupled 3d−5d double perovskites studied by x-ray absorption spectroscopy

Cited by 22 publications

References 35 publications

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Enhanced photocatalytic CO2 reduction with defective TiO2 nanotubes modified by single-atom binary metal components

Crystal and Magnetic Structures of La2CoPtO6 Double Perovskite

Enhanced Photocatalytic CO2 Reduction with Defective TiO2 Nanotubes Modified by Single-Atom Binary Metal Components

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Crystal and Magnetic Structures of La₂CoPtO₆ Double Perovskite