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Effects of Sr/Ti-ratio in SrTiO3-based SOFC anodes investigated by the use of cone-shaped electrodes

Blennow Tullmar, Peter LU ; Kammer Hansen, Kent ; Wallenberg, Reine LU and Mogensen, Mogens (2006) In Electrochimica Acta 52(4). p.1651-1661
Abstract
In this work the A-site deficiency limit for undoped SrTiO3, calcined in air or reducing atmosphere, was investigated. XRD and SEM analyses showed that when using the solid-state synthesis route it was difficult to achieve any A-site deficiency. Even very small deviations from unity in the Sr/Ti-ratio resulted in impurity phases. The effects of Sr/Ti-ratio on the performance of SrTiO3 anodes for solid oxide fuel cells (SOFCs) was investigated by impedance spectroscopy with cone-shaped electrodes. The electrocatalytic activity of the SrTiO3 cone samples, with various amount of reduced titanium dioxide phases (Magnéli phases), was investigated for oxidation of H2 at 700 °C. High temperature treatment at 1000 °C, between the measurements at... (More)
In this work the A-site deficiency limit for undoped SrTiO3, calcined in air or reducing atmosphere, was investigated. XRD and SEM analyses showed that when using the solid-state synthesis route it was difficult to achieve any A-site deficiency. Even very small deviations from unity in the Sr/Ti-ratio resulted in impurity phases. The effects of Sr/Ti-ratio on the performance of SrTiO3 anodes for solid oxide fuel cells (SOFCs) was investigated by impedance spectroscopy with cone-shaped electrodes. The electrocatalytic activity of the SrTiO3 cone samples, with various amount of reduced titanium dioxide phases (Magnéli phases), was investigated for oxidation of H2 at 700 °C. High temperature treatment at 1000 °C, between the measurements at 700 °C, showed that high content of Magnéli phases leads to faster degradation of the activity. The suitability for using cone-shaped electrodes as a tool for investigating electrode materials is discussed. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Magnéli phases, Area normalization, A-site deficiency, Cone-shaped electrode, SrTiO3
in
Electrochimica Acta
volume
52
issue
4
pages
1651 - 1661
publisher
Pergamon Press Ltd.
external identifiers
  • wos:000243294300037
  • scopus:33751254077
ISSN
0013-4686
DOI
10.1016/j.electacta.2006.03.096
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
id
6f1e49ca-47db-463b-bdfc-af236de3980c (old id 638462)
date added to LUP
2016-04-01 11:41:58
date last changed
2021-02-17 06:06:37
@article{6f1e49ca-47db-463b-bdfc-af236de3980c,
  abstract     = {In this work the A-site deficiency limit for undoped SrTiO3, calcined in air or reducing atmosphere, was investigated. XRD and SEM analyses showed that when using the solid-state synthesis route it was difficult to achieve any A-site deficiency. Even very small deviations from unity in the Sr/Ti-ratio resulted in impurity phases. The effects of Sr/Ti-ratio on the performance of SrTiO3 anodes for solid oxide fuel cells (SOFCs) was investigated by impedance spectroscopy with cone-shaped electrodes. The electrocatalytic activity of the SrTiO3 cone samples, with various amount of reduced titanium dioxide phases (Magnéli phases), was investigated for oxidation of H2 at 700 °C. High temperature treatment at 1000 °C, between the measurements at 700 °C, showed that high content of Magnéli phases leads to faster degradation of the activity. The suitability for using cone-shaped electrodes as a tool for investigating electrode materials is discussed.},
  author       = {Blennow Tullmar, Peter and Kammer Hansen, Kent and Wallenberg, Reine and Mogensen, Mogens},
  issn         = {0013-4686},
  language     = {eng},
  number       = {4},
  pages        = {1651--1661},
  publisher    = {Pergamon Press Ltd.},
  series       = {Electrochimica Acta},
  title        = {Effects of Sr/Ti-ratio in SrTiO3-based SOFC anodes investigated by the use of cone-shaped electrodes},
  url          = {http://dx.doi.org/10.1016/j.electacta.2006.03.096},
  doi          = {10.1016/j.electacta.2006.03.096},
  volume       = {52},
  year         = {2006},
}