A high performance intermediate temperature fuel cell based on a thick oxide–carbonate electrolyte

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• 作者：Lei Zhang ; Rong Lan ; Xiaoxiang Xu ; Shanwen Tao ; Yinzhu Jiang ; Arno Kraft
• 关键词：Intermediate temperature ; Fuel cell ; Co-doped ceria ; Composite electrolyte
• 刊名：Journal of Power Sources
• 出版年：2009
• 出版时间：1 December 2009
• 年：2009
• 卷：194
• 期：2
• 页码：967-971
• 全文大小：970 K

文摘

A high performance intermediate temperature fuel cell (ITFC) with composite electrolyte composed of co-doped ceria Ce_0.8Gd_0.05Y_0.15O_1.9 (GYDC) and a binary carbonate-based (52 mol % Li₂CO₃/48 mol % Na₂CO₃), 1.2 mm thick electrolyte layer has been developed. Co-doped Ce_0.8Gd_0.05Y_0.15O_1.9 was synthesized by a glycine–nitrate process and used as solid support matrix for the composite electrolyte. The conductivity of both composite electrolyte and GYDC supporting substrate were measured by AC impedance spectroscopy. It showed a sharp conductivity jump at about 500 °C when the carbonates melted. Single cells with thick electrolyte layer were fabricated by a dry-pressing technique using NiO as anode and Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ or lithiated NiO as cathode. The cell was tested at 450–550 °C using hydrogen as the fuel and air as the oxidant. Excellent performance with high power density of 670 mW cm⁻² at 550 °C was achieved for a 1.2 mm thick composite electrolyte containing 40 wt % carbonates which is much higher than that of a cell based on pure GYDC with a 70 μm thick electrolyte layer.