Novel structured gadolinium doped ceria based electrolytes for intermediate temperature solid oxide fuel cells

Timurkutluk B., Timurkutluk C., MAT M. D., Kaplan Y.

JOURNAL OF POWER SOURCES, vol.196, no.22, pp.9361-9364, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 196 Issue: 22
  • Publication Date: 2011
  • Doi Number: 10.1016/j.jpowsour.2011.07.047
  • Journal Name: JOURNAL OF POWER SOURCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.9361-9364
  • Keywords: Solid oxide fuel cell, GDC, YSZ, ScSZ, ScCeSZ, Composite electrolyte, ELECTRICAL-CONDUCTIVITY, ALUMINA ADDITION, COMPOSITE ELECTROLYTES, SOFC, PERFORMANCE, STABILITY
  • Middle East Technical University Affiliated: No

Abstract

Novel three-layered intermediate temperature solid oxide fuel cell (SOFC) electrolytes based on gadolinium doped ceria (GDC) are developed to suppress the electronic conductivity of GDC, to improve the mechanical properties of the cell and to minimize power loss due to mixed conductive nature of GDC. Three different electrolytes are fabricated by sandwiching thin YSZ. ScSZ and ScCeSZ between two relatively thick GDC layers. An electrolyte composed of pure GDC is also manufactured for comparison. NiO/GDC and LSCF/GDC electrodes are then coated on the electrolytes by a screen printing route. SEM results show that it is possible to obtain dense and crack free thin layers of YSZ, ScSZ and ScCeSZ between two GDC layers without delamination. Performance measurements indicate that interlayered thin electrolytes act as an electronic conduction barrier and improve open circuit voltages (OCVs) of GDC based cells. (C) 2011 Elsevier B.V. All rights reserved.