Surface chemistry and restructuring in thin-film La:N +1NinO3 n +1 (n = 1, 2 and 3) Ruddlesden-Popper oxides

K. T. Wu, H. Téllez, John William Richard Druce, M. Burriel, F. Yang, D. W. McComb, Tatsumi Ishihara, J. A. Kilner, S. J. Skinner

Research output: Contribution to journalArticle

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Abstract

Understanding the surface chemistry and oxygen surface exchange activity in mixed conducting perovskite and related perovskite oxides is of great relevance in developing electrochemical devices. Mixed conducting Ruddlesden-Popper Lan+1NinO3n+1 phases (n = 1, 2 and 3) have been considered as promising electrodes for electrochemical energy conversion cells due to their layered structure allowing non-stoichiometric defect structures. This study focuses on a systematic investigation of the chemical composition of the outermost atomic surfaces of as-deposited and annealed epitaxial films of Lan+1NinO3n+1 (n = 1, 2 and 3). For both as-deposited and annealed films, the analysis of the outermost surface using low energy ion scattering shows preferential Lao-termination. The results also provide evidence of an associated Ni-enrichment below the outermost surface. These findings suggest significant atomic rearrangement occurs during deposition and subsequent annealing. To investigate the thermal stability of these films during deposition, further microstructural analysis was carried out by means of high-resolution scanning transmission electron microscopy, showing significant re-orientation of Lao layers after a post-annealing heat treatment. In thin films of n = 2, 3 phases, surface restructuring reduces the epitaxy of the films and hence any potential beneficial anisotropy in transport properties will be lost. Care must therefore be exercised in processing these materials for electrode applications.

Original languageEnglish
Pages (from-to)9003-9013
Number of pages11
JournalJournal of Materials Chemistry A
Volume5
Issue number19
DOIs
Publication statusPublished - Jan 1 2017

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Surface chemistry
Oxides
Thin films
Perovskite
Annealing
Electrodes
Defect structures
Epitaxial films
Energy conversion
Epitaxial growth
Transport properties
Anisotropy
Thermodynamic stability
Heat treatment
Scattering
Ions
Oxygen
Transmission electron microscopy
Scanning electron microscopy
Processing

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Wu, K. T., Téllez, H., Druce, J. W. R., Burriel, M., Yang, F., McComb, D. W., ... Skinner, S. J. (2017). Surface chemistry and restructuring in thin-film La:N +1NinO3 n +1 (n = 1, 2 and 3) Ruddlesden-Popper oxides. Journal of Materials Chemistry A, 5(19), 9003-9013. https://doi.org/10.1039/c7ta01781b

Surface chemistry and restructuring in thin-film La:N +1NinO3 n +1 (n = 1, 2 and 3) Ruddlesden-Popper oxides. / Wu, K. T.; Téllez, H.; Druce, John William Richard; Burriel, M.; Yang, F.; McComb, D. W.; Ishihara, Tatsumi; Kilner, J. A.; Skinner, S. J.

In: Journal of Materials Chemistry A, Vol. 5, No. 19, 01.01.2017, p. 9003-9013.

Research output: Contribution to journalArticle

Wu, KT, Téllez, H, Druce, JWR, Burriel, M, Yang, F, McComb, DW, Ishihara, T, Kilner, JA & Skinner, SJ 2017, 'Surface chemistry and restructuring in thin-film La:N +1NinO3 n +1 (n = 1, 2 and 3) Ruddlesden-Popper oxides', Journal of Materials Chemistry A, vol. 5, no. 19, pp. 9003-9013. https://doi.org/10.1039/c7ta01781b
Wu, K. T. ; Téllez, H. ; Druce, John William Richard ; Burriel, M. ; Yang, F. ; McComb, D. W. ; Ishihara, Tatsumi ; Kilner, J. A. ; Skinner, S. J. / Surface chemistry and restructuring in thin-film La:N +1NinO3 n +1 (n = 1, 2 and 3) Ruddlesden-Popper oxides. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 19. pp. 9003-9013.
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