Next Article in Journal
Low–Threshold and High Intensity Random Lasing Enhanced by MnCl2
Previous Article in Journal
Upscaling of a Batch De-Vulcanization Process for Ground Car Tire Rubber to a Continuous Process in a Twin Screw Extruder
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Materials 2016, 9(9), 717; doi:10.3390/ma9090717

New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells

1
Institute of Materials Science of Madrid, CSIC, Cantoblanco, Madrid 28049, Spain
2
Institute of Materials and Thermomechanics, Universidad Austral de Chile, General Lagos 2086, Valdivia 5111187, Chile
3
Grupo CLIOPE, National Technological University, Reg. Mendoza, Rodríguez 273, Mendoza 5500, Argentina
4
Institut Laue-Langevin, B.P. 156x, Grenoble 38042, France
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 8 July 2016 / Revised: 12 August 2016 / Accepted: 18 August 2016 / Published: 24 August 2016
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [2941 KB, uploaded 24 August 2016]   |  

Abstract

In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO3−δ, we have designed and prepared SrCo1−xRexO3−δ phases (x = 0.05 and 0.10), successfully avoiding the competitive hexagonal 2H polytypes. Their performance as cathode materials in intermediate-temperature solid oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and in situ temperature-dependent neutron powder diffraction (NPD) experiments for x = 0.10. At room temperature, SrCo1−xRexO3−δ perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ ao, c = 2ao (ao = 3.861 and 3.868 Å, for x = 0.05 and 0.10, respectively). The crystal structure evolves above 380 °C to a simple cubic perovskite unit cell, as observed from in-situ NPD data. The electrical conductivity gave maximum values of 43.5 S·cm−1 and 51.6 S·cm−1 for x = 0.05 and x = 0.10, respectively, at 850 °C. The area specific resistance (ASR) polarization resistance determined in symmetrical cells is as low as 0.087 Ω·cm2 and 0.065 Ω·cm2 for x = 0.05 and x = 0.10, respectively, at 850 °C. In single test cells these materials generated a maximum power of around 0.6 W/cm2 at 850 °C with pure H2 as a fuel, in an electrolyte-supported configuration with La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) as the electrolyte. Therefore, we propose the SrCo1−xRexO3−δ (x = 0.10 and 0.05) perovskite oxides as promising candidates for cathodes in IT-SOFC. View Full-Text
Keywords: IT-SOFC; hydrogen; cathode; neutron diffraction; SrCoO3 IT-SOFC; hydrogen; cathode; neutron diffraction; SrCoO3
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Troncoso, L.; Gardey, M.C.; Fernández-Díaz, M.T.; Alonso, J.A. New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells. Materials 2016, 9, 717.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top