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Samaria-doped Ceria Modified Ni/YSZ Anode for Direct Methane Fuel in Tubular Solid Oxide Fuel Cells by Impregnation Method
Jian-feng Gao*, Rui-fen Tian, Chang-rong Xia, Qiong Chen
Department of Materials Science and Engineering, University of Science and Technology of China,Hefei 230026, China
Abstract:
A porous NiO/yttria-stabilized zirconia anode substrate for tubular solid oxide fuel cells was prepared by gel casting technique. Nano-scale samaria-doped ceria (SDC) particles were formed onto the anode substrate to modify the anode microstructure by the impregnation of solution of Sm(NO3)3 and Ce(NO3)3. Electrochemical impedance spectroscopy, current-voltage and current-powder curves of the cells were measured using an electrochemical workstation. Scanning electron microcopy was used to observe the microstructure. The results indicate that the stability of the performance of the cell operated on humidified methane can be significantly improved by incorporating the nano-structured SDC particles, compared with the unmodified cell. This verifies that the coated SDC electrodes are very effective in suppressing catalytic carbon formation by blocking methane from approaching the Ni, which is catalytically active towards methane pyrolysis. In addition, it was found that a small amount of deposited carbon is beneficial to the performance of the anode. The cell showed a peak power density of 225 mW/cm2 when it was fed with H2 fuel at 700 °C, but the power density increased to 400 mW/cm2 when the fuel was switched from hydrogen to methane at the same flow rate. Methane conversion achieved about 90%, measured by gas chromatogram with a 10.0 mL/min flow rate of fuel at 700°C. Although the carbon deposition was not suppressed absolutely, some deposited carbon was beneficial for performance improvement.
Key words:  Tubular solid oxide fuel cell, Gel casting, Impregnation, Methane
FundProject:
Samaria-doped Ceria Modified Ni/YSZ Anode for Direct Methane Fuel in Tubular Solid Oxide Fuel Cells by Impregnation Method
张龙山, 高建峰*, 田瑞芬, 夏长荣
中国科学技术大学材料科学与工程系,合肥230026
摘要:
以NiO和8%(摩尔分数)氧化钇稳定的氧化锆为原料,采用注凝成型工艺制备了管状固体氧化物燃料电池阳极支撑体.用离子浸渍法对阳极支撑体进行表面修饰.用电化学工作站测单电池交流阻抗和输出性能并且用化学气相色谱仪对电池尾气进行分析.测试结果表明修饰后的阳极在通甲烷的情况下出现了一定程度的积炭,但是积炭现象在一定的测试时间内达到平衡,没有对电池造成破坏,并且显著地提高了电池阳极的电化学性能.单电池在通入氢气和甲烷的情况下最大输出功率密度分别达到了225和400 mW/cm2
关键词:  管状固体氧化物燃料电池,凝胶浇注,离子浸渍,甲烷
DOI:10.1088/1674-0068/22/04/429-434
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