Journal Article

FZJ-2019-05355

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Self-reduction of the native TiO2 (110) surface during cooling after thermal annealing – in-operando investigations

Rogala, M. (Corresponding author) ; Bihlmayer, G.FZJ* ; Dabrowski, P. ; Rodenbücher, C.FZJ* ; Wrana, D. ; Krok, F. ; Klusek, Z. ; Szot, K.FZJ*

2019
Macmillan Publishers Limited, part of Springer Nature [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/23230  doi:10.1038/s41598-019-48837-3

Abstract: We investigate the thermal reduction of TiO2 in ultra-high vacuum. Contrary to what is usually assumed, we observe that the maximal surface reduction occurs not during the heating, but during the cooling of the sample back to room temperature. We describe the self-reduction, which occurs as a result of differences in the energies of defect formation in the bulk and surface regions. The findings presented are based on X-ray photoelectron spectroscopy carried out in-operando during the heating and cooling steps. The presented conclusions, concerning the course of redox processes, are especially important when considering oxides for resistive switching and neuromorphic applications and also when describing the mechanisms related to the basics of operation of solid oxide fuel cells.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. Elektronische Materialien (PGI-7)
4. JARA-FIT (JARA-FIT)
5. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)

Appears in the scientific report 2019

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