Surface Electronic Structure of Proton-doped YSZ Thin Film by Soft-X-ray Photoemission Spectroscopy

Takayanagi, Makoto; Tsuchiya, Takashi; Minohara, Makoto; Kobayashi, Masaki; Horiba, Koji; Kumigashira, Hiroshi; Higuchi, Tohru

doi:10.14723/tmrsj.42.61

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…; and (ii) the peak at 533 eV in the wet-annealed thin film corresponds to H 2 O molecules physisorbed at the surface [35]. The same peak structures have been reported in YSZ thin film with surface proton conduction at room temperature [15,36]. The peak ratio of physisorbed H 2 O was increased from 7.8% to 24% by wet-annealing.…”

Section: Resultssupporting

confidence: 70%

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

et al. 2020

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Sm-doped CeO 2-δ (Ce 0.9 Sm 0.1 O 2-δ ; SDC) thin films were prepared on Al 2 O 3 (0001) substrates by radio frequency magnetron sputtering. The prepared thin films were preferentially grown along the [111] direction, with the spacing of the (111) plane (d 111) expanded by 2.6% to compensate for a lattice mismatch against the substrate. The wet-annealed SDC thin film, with the reduced d 111 value, exhibited surface protonic conduction in the lowtemperature region below 100°C. The O1s photoemission spectrum exhibits H 2 O and OH − peaks on the SDC surface. These results indicate the presence of physisorbed water layers and the generation of protons on the SDC (111) surface with oxygen vacancies. The protons generated on the SDC surface were conducted through a physisorbed water layer by the Grotthuss mechanism.

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Section: Resultssupporting

confidence: 70%

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

et al. 2020

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“…The first is when H 2 O molecules are chemisorbed at the oxygen vacancy on the surface of YSZ. [5][6][7]10,11,32,33) The chemisorbed H 2 O molecules form OH − as shown in Eq. ( 2) using Kröger-Vink notation.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Oxide ion and proton conduction controlled in nano-grained yttria stabilized ZrO₂ thin films prepared by pulse laser deposition

Etoh¹,

Tsuchiya²,

Takayanagi³

et al. 2019

Jpn. J. Appl. Phys.

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Nano-grained yttria stabilized ZrO 2 (YSZ) thin films were prepared by pulse laser deposition using a high energy ArF excimer laser in order to attain high-quality solid electrolyte thin films. The YSZ thin films exhibited smooth surfaces, which had not been previously achieved due to serious droplet generation. While the ionic conductivities of the two films prepared at different oxygen pressures are similar in the high temperature region, they differ significantly, over five orders of magnitude, at temperatures below 100 °C. The dense YSZ films had extremely low ion conductivity (∼10 −11 S cm −1 ) at room temperature due to slow oxide ion transport in the YSZ inner-grains, while the porous YSZ films had excellent ionic conductivity (∼10 −6 S cm −1 ) due to fast proton transport via the YSZ grains surface. Variation in the porosity of the films, controlled by oxygen pressure, was attributed to the origin of the transition from oxide ion to proton conduction. © 2019 The Japan Society of Applied Physics Microstructure evaluationThe crystalline qualities of the prepared YSZ thin films were investigated by X-ray diffraction (XRD) with Cu Kα

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“…As revealed, O 1s can be deconvoluted or fitted into three peaks centered at 530.0, 531.5, and 532.5 eV, for both P O 2 . These binding energies are typical values for O1s lattice oxygen (oxygen bonded with Zr and/or Sc/Y), hydroxyl, and weakly adsorbed oxygen/H 2 O [42][43][44][45]. The PES stacked spectra of Zr 3d, Y 3d, and Sc 2p for the two oxygen partial pressures are shown in Figure 5c-e, respectively.…”

Section: Photoemission Spectroscopy (Pes)mentioning

confidence: 80%

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

et al. 2022

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Scandium (Sc) and yttrium (Y) co-doped ZrO2 (ScYSZ) thin films were prepared on a SiO2-Si substrate via pulsed laser deposition (PLD) method. In order to obtain good quality thin films with the desired microstructure, various oxygen partial pressures (PO2) from 0.01 Pa to 10 Pa and substrate temperatures (Ts) from 25 °C to 800 °C were investigated. X-ray diffraction (XRD) patterns results showed that amorphous ScYSZ thin films were formed at room substrate temperature while cubic polycrystalline thin films were obtained at higher substrate temperatures (Ts = 200 °C, 400 °C, 600 °C, 800 °C). Raman spectra revealed a distinct Raman shift at around 600 cm−1 supporting a cubic phase. However, a transition from cubic to tetragonal phase can be observed with increasing oxygen partial pressure. Photoemission spectroscopy (PES) spectra suggested supporting analysis that more oxygen vacancies in the lattice can be observed for samples deposited at lower oxygen partial pressures resulting in a cubic structure with higher dopant cation binding energies as compared to the tetragonal structure observed at higher oxygen partial pressure. On the other hand, dense morphologies can be obtained at lower PO2 (0.01 Pa and 0.1 Pa) while more porous morphologies can be obtained at higher PO2 (1.0 Pa and 10 Pa).

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Surface Electronic Structure of Proton-doped YSZ Thin Film by Soft-X-ray Photoemission Spectroscopy

Cited by 9 publications

References 18 publications

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

Oxide ion and proton conduction controlled in nano-grained yttria stabilized ZrO₂ thin films prepared by pulse laser deposition

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

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Surface Electronic Structure of Proton-doped YSZ Thin Film by Soft-X-ray Photoemission Spectroscopy

Cited by 9 publications

References 18 publications

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)

Oxide ion and proton conduction controlled in nano-grained yttria stabilized ZrO2 thin films prepared by pulse laser deposition

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

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Oxide ion and proton conduction controlled in nano-grained yttria stabilized ZrO₂ thin films prepared by pulse laser deposition