Sinteractivity, proton conductivity and chemical stability of BaZr(0.7)In(0.3)O(3-delta) for solid oxide fuel cells (SOFCs)

Authors

Lei Bi, National Institute for Materials Science, Japan
Emiliana Fabbri, National Institute for Materials Science, Japan
Ziqi Sun, University of WollongongFollow
Enrico Traversa, National Institute for Materials Science, Japan

RIS ID

57244

Publication Details

Bi, L, Fabbri, E, Sun, Z & Traversa, E (2011), Sinteractivity, proton conductivity and chemical stability of BaZr(0.7)In(0.3)O(3-delta) for solid oxide fuel cells (SOFCs), Solid State Ionics, 196(1), pp. 59-64.

Abstract

In³⁺ was used as dopant for BaZrO₃ proton conductor and 30 at%-doped BaZrO₃ samples (BaZr_0.7In_0.3O_3-δ, BZI) were prepared as electrolyte materials for proton-conducting solid oxide fuel cells (SOFCs). The BZI material showed a much improved sinteractivity compared with the conventional Y-doped BaZrO₃. The BZI pellets reached almost full density after sintering at 1600 °C for 10 h, whereas the Y-doped BaZrO₃ samples still remained porous under the same sintering conditions. The conductivity measurements indicated that BZI pellets showed smaller bulk but improved grain boundary proton conductivity, when compared with Y-doped BaZrO₃ samples. A total proton conductivity of 1.7 × 10⁻³ S cm⁻¹ was obtained for the BZI sample at 700 °C in wet 10% H₂ atmosphere. The BZI electrolyte material also showed adequate chemical stability against CO₂ and H₂O, which is promising for application in fuel cells.