Sinteractivity, proton conductivity and chemical stability of BaZr0.7In0.3O3-δ for solid oxide fuel cells (SOFCs)

Abstract In 3+ was used as dopant for BaZrO 3 proton conductor and 30 at%-doped BaZrO 3 samples (BaZr 0.7 In 0.3 O 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 BaZrO 3 . The BZI pellets reached almost full density after sintering at 1600 °C for 10 h, whereas the Y-doped BaZrO 3 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 BaZrO 3 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% H 2 atmosphere. The BZI electrolyte material also showed adequate chemical stability against CO 2 and H 2 O, which is promising for application in fuel cells.

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