Dan Cao,Mingyang Zhou,Xiaomin Yan,Zhijun Liu,Jiang Liu
An anode-supported tubular protonic ceramic fuel cell with BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ electrolyte is fabricated using dip-coating technique. Electrochemical performances of the cell are tested at temperatures from 600 to 200 °C, utilizing humidified H 2 (3 vol% H 2 O) as fuel and ambient air as oxidant. With an effective area of 2.3 cm 2 , the cell yields a peak power density of 465 mW cm −2 at 600 °C and 118 mW cm −2 at 450 °C. Even when the temperature is as low as 200 °C, there is still an output power of 3 mW. Stability of the cell under 600 °C is tested by operating the cell at a constant voltage of 0.7 V. The test lasts for 30 h during which the operating power density decreases rapidly in the first 10 h, then tend to be stable at 300 mW cm −2 .
Zidai Fan,Dan Cao,Mingyang Zhou,Ziyi Zhu,Meilong Chen,Jiang Liu
Proton-conducting perovskite oxide BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ (BZCY) is prepared by carbonate coprecipitation method using Tween-80 as the surfactant . A powder with well dispersed particles of an average size of 200 nm is obtained. The powder is applied as the original material of the electrolyte in an Ni-based anode-supported protonic ceramic fuel cell (PCFC). The electrolyte can be densified to high density after co-sintering with the anode substrate, without any sintering aids, at 1400 °C in open air. The PCFC with an electrolyte thickness of 20 μm, using humid hydrogen (3% H 2 O) as the fuel and ambient air as the oxidant, gives a peak power density of 1050 mW cm −2 at 700 °C. The conducting activation energy of the electrolyte is 0.36 eV. The superiority of the BZCY powder prepared by the coprecipitation method is investigated by comparing with a BZCY powder made by conventional solid-state reaction method.
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