阳极支撑质子导体电解质固体氧化物燃料电池的制备及其性能研究

本研究采用高温固相反应法合成了BaCe_0.7Zr_0.1Y_0.2O_3-d (BCZY7)质子导体氧化物, 对材料的物相结构和微观形貌进行表征和分析, 并将BCZY7作为固体氧化物燃料电池(SOFC)的电解质, 通过浸渍法和共烧结法成功制备了阳极支撑的NiO-BCZY7/BCZY7/La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF)-BCZY7钮扣式电池。以氢气(含3vol% H₂O)为燃料, 空气为氧化剂, 对电池的电化学性能进行测试。结果表明, 在600、550、500 ℃时, 电池的最高功率密度分别为203, 123, 92 mW×cm^-2, 而传统(ZrO₂)_0.92(Y₂O₃)_0.08基SOFC在600 ℃时通常只有几十毫瓦的单位面积输出, 质子导体电解质可以极大改善SOFC的中低温性能, 缓解SOFC工作温度高的问题。

Fabrication and Characterization of Anode-supported Solid Oxide Fuel Cell Based on Proton Conductor Electrolyte

Proton conducting oxide BaCe_0.7Zr_0.1Y_0.2O_3-d (BCZY7) was synthesized by high temperature solid-state reaction method, which crystal structure and microstructure morphology were characterized. The anode-supported button solid oxide fuel cell (SOFC), NiO-BCZY7/BCZY7/La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF)-BCZY7, was fabricated by combining the dip-coating and co-sintering processes. It operated by using H₂ (containing 3vol% H₂O) as fuel and ambient air as oxidant. The maximum power density of the cell reaches 203, 123 and 92 mW×cm^-2 at 600, 550 and 500 ℃, respectively. However, traditional SOFCs based on (ZrO₂)_0.92(Y₂O₃)_0.08 electrolyte usually display only tens of milliwatts output per unit area at 600 ℃. Proton conducting electrolyte greatly improves the low and medium temperature performance of SOFCs and provides a promising solution to reduce SOFCs’ operating temperature.