Lowering grain boundary resistance of BaZr0.8Y0.2O3-δ with LiNO3 sintering-aid improves proton conductivity for fuel cell operation

被引：123

作者：

Sun, Ziqi ^{[1
]}

Fabbri, Emiliana ^{[1
]}

Bi, Lei ^{[1
]}

Traversa, Enrico ^{[1
]}

机构：

[1] Natl Inst Mat Sci, WPI Int Res Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 17期

关键词：

DOPED BARIUM ZIRCONATE; CHEMICAL-STABILITY; ELECTRICAL-CONDUCTIVITY; ELECTROLYTE; CONDUCTORS; LIYO2; FILMS;

D O I：

10.1039/c0cp01470b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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-delta (BZY20) protonic conductors. The Li-additive totally evaporated during the sintering process at 1600 degrees 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 x 10(-3) S cm(-1) at 600 degrees C. Based on the improved sinterability, anode-supported fuel cells with 25 mm-thick BZY20-Li electrolyte membranes were fabricated by a co-firing technique. The peak power density obtained at 700 degrees C for a BZY-Ni/BZY20-Li/La0.6Sr0.4Co0.2Fe0.8O3-delta (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.

引用

页码：7692 / 7700

页数：9

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