Fabrication and characterization of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ—Gadolinia-doped ceria cathode for an anode-supported solid-oxide fuel cell

✍ Scribed by Wei-Xin Kao; Maw-Chwain Lee; Tai-Nan Lin; Chun-Hsiu Wang; Yang-Chuang Chang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 614 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2009.10.057

✦ Synopsis

Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-ı (BSCF) and gadolinia-doped ceria (GDC) were synthesized via a glycine-nitrate process (GNP). A cubic perovskite of BSCF was observed by X-ray diffraction (XRD) at a calcination temperature above 950 • C. An anode-supported solid-oxide fuel cell was constructed from the porous NiO + YSZ as the anode substrate, the yittria-stabilized zirconia (YSZ) as the electrolyte, and the porous BSCF-GDC layer as the cathode with a GDC barrier layer. For the performance test, the maximum power density was 191.3 mW cm -2 at a temperature of 750 • C with H 2 fuel and air at flow rates of 335 and 670 sccm, respectively. According to the AC-impedance data, the charge-transfer resistances of the electrodes were 0.10 and 1.59 cm 2 , and the oxygen-reduction and oxygen-ion diffusion resistances were 0.69 and 0.98 cm 2 at 750 and 600 • C, respectively. SEM microstructural characterization indicated that the fuel cell as fabricated exhibited good compatibility between cathode and electrolyte layers.