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Chemically Stable Yttrium and Tin Co‐Doped Barium Zirconate Electrolyte for Next Generation High Performance Proton‐Conducting Solid Oxide Fuel Cells
Author(s) -
Sun Wenping,
Liu Mingfei,
Liu Wei
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201201062
Subject(s) - materials science , electrolyte , proton conductor , non blocking i/o , conductivity , oxide , x ray photoelectron spectroscopy , chemical engineering , yttrium , analytical chemistry (journal) , inorganic chemistry , chemistry , electrode , biochemistry , chromatography , engineering , metallurgy , catalysis
Abstract BaZr 0.7 Sn 0.1 Y 0.2 O 3– δ (BZSY) is developed as a novel chemically stable proton conductor for solid oxide fuel cells (SOFCs). BZSY possesses the same cubic symmetry of space group Pm‐3m with BaZr 0.8 Y 0.2 O 3‐ δ (BZY). Thermogravimetric analysis (TGA) and X‐ray photoelectron spectra (XPS) results reveal that BZSY exhibits remarkably enhanced hydration ability compared to BZY. Correspondingly, BZSY shows significantly improved electrical conductivity. The chemical stability test shows that BZSY is quite stable under atmospheres containing CO 2 or H 2 O. Fully dense BZSY electrolyte films are successfully fabricated on NiO–BZSY anode substrates followed by co‐firing at 1400 °C for 5 h and the film exhibits excellent electrical conductivity under fuel cell conditions. The single cell with a 12‐μm‐thick BZSY electrolyte film outputs by far the best performance for acceptor‐doped BaZrO 3 ‐based SOFCs. With wet hydrogen (3% H 2 O) as the fuel and static air as the oxidant, the peak power density of the cell achieves as high as 360 mWcm −2 at 700 °C, an increase of 42% compared to the reported highest performance of BaZrO 3 ‐based cells. The encouraging results demonstrate that BZSY is a good candidate as the electrolyte material for next generation high performance proton‐conducting SOFCs.