Lowering grain boundary resistance of BaZr0.8Y 0.2O3-δ with LiNO3 sintering-aid improves proton conductivity for fuel cell operation

Ziqi Sun, Emiliana Fabbri, Lei Bi, Enrico Traversa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

A novel sintering additive based on LiNO3 was used to overcome the drawbacks of poor sinterability and low grain boundary conductivity in BaZr0.8Y0.2O3-δ (BZY20) protonic conductors. The Li-additive totally evaporated during the sintering process at 1600°C for 6 h, which led to highly dense BZY20 pellets (96.5% of the theoretical value). The proton conductivity values of BZY20 with Li sintering-aid were significantly larger than the values reported for BZY sintered with other metal oxides, due to the fast proton transport in the "clean" grain boundaries and grain interior. The total conductivity of BZY20-Li in wet Ar was 4.45 × 10-3 S cm-1 at 600°C. Based on the improved sinterability, anode-supported fuel cells with 25 μm-thick BZY20-Li electrolyte membranes were fabricated by a co-firing technique. The peak power density obtained at 700°C for a BZY-Ni/BZY20-Li/La0.6Sr0.4Co0.2Fe 0.8O3-δ (LSCF)-BZY cell was 53 mW cm-2, which is significantly larger than the values reported for fuel cells using electrolytes made of BZY sintered with the addition of ZnO and CuO, confirming the advantage of using Li as a sintering aid.

Original languageEnglish (US)
Pages (from-to)7692-7700
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume13
Issue number17
DOIs
StatePublished - May 7 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Fingerprint

Dive into the research topics of 'Lowering grain boundary resistance of BaZr<sub>0.8</sub>Y <sub>0.2</sub>O<sub>3-δ</sub> with LiNO<sub>3</sub> sintering-aid improves proton conductivity for fuel cell operation'. Together they form a unique fingerprint.

Cite this