High-performance low-temperature solid oxide fuel cells using thin proton-conducting electrolyte with novel cathode

摘要

We have fabricated BaCe_(0.8)Gd_(0.2)O_(3-δ) (BCGO) thin films with thickness in the range of 5-10 μm over substrates composed of Ce_(0.8)Gd_(0.2)O_(1.9) (CGO)-NiO using a colloidal spray deposition method. A perovskite-type BaZr_(0.2)Co_(0.4)Fe_(0.4)O_(3-δ) (BZCFO) was employed as a novel cathode material. The performances of solid oxide fuel cells were investigated from 450 ℃ to 600 ℃. The fuel cell with the BCGO film of 9 μm in thickness showed maximum power outputs of 237, 192, 136 and 89 mW cm ~(-2) at 600, 550, 500 and 450 ℃, respectively. The impedance measurements at open circuit conditions showed the polarization resistances of the electrode were about 0.25 and 1.00 Ω cm~2 at 600 and 500 ℃, respectively. The low interfacial resistances indicated that the BZCFO was a promising cathode material for low-temperature proton-conducing solid oxide fuel cells.