集流体对平板型固体氧化物燃料电池性能的影响机制  

Effect of Current Collector on the Performance of Planar Solid Oxide Fuel Cells

作　　者：张纪豪 权蒙豪 孙凯华 韩敏芳[1,2,3] ZHANG Jihao;QUAN Menghao;SUN Kaihua;HAN Minfang(School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Xuzhou Huatsing Jingkun Energy Co.,Ltd.,Xuzhou 221005,Jiangsu,China;Department of Energy and PowerEngineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国矿业大学低碳能源与动力工程学院,江苏徐州221116 [2]徐州华清京昆能源有限公司,江苏徐州221005 [3]清华大学能源与动力工程系,北京100084

出　　处：《硅酸盐学报》2024年第1期19-29,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52206289);江苏省碳达峰碳中和创新专项(BE2022029)。

摘　　要：工业尺寸固体氧化物燃料电池面积大、且存在翘曲,可靠集电是SOFC高效输出的重要保障。以长条形阳极支撑半电池为基体,分割阴极制备成4个面积2.0 cm×2.1 cm的绝缘阴极区域,每个区域覆盖不同面积银网构成差异性集电。在各绝缘区域分别开展电化学阻抗谱测试和电流-电压特性曲线扫描,结果表明:开路下25%银网覆盖区域阻抗实部显著高于其他区域,拉载时同等输出电压下电池电流密度随银网面积的减少而单调递减。测量同类电池阴阳极电导率,并表征微观构造。相关参数代入模型,得出沿流道方向电流与电压分布:无银网覆盖阴极存在累积的水平电流,造成总输出电流减小及电流密度分布不均,影响电极极化过程,恶化电池输出性能。Introduction There exists a poor contact between the current collector and the electrode due to the warping of planar solid oxide fuel cells and the uneven compressive forces of the stack.In the operation of solid oxide fuel cells(SOFCs),the poor contact between the current collector and the electrode can result in a contact resistance,thereby severely deteriorating the electrical performance of SOFCs.To optimize the current collection performance of SOFCs,it is necessary to conduct the experimental research and numerical simulation on the impact of current collector on the performance of planar SOFCs.Methods The fuel cell samples were provided by Xuzhou Huatsing Jingkun Energy Co.,Ltd.,China.The long anode-supported SOFC samples were prepared with cathode segmented to four insulted areas of 2.0 cm×2.1 cm.Each region was covered with different areas of silver mesh to constitute differential contact resistances.This ensured the consistency in the sample cell preparation and cell installation process,aside from the variations in the current collection.To enhance fuel sealing,the anode-side test fixture was made from a single metal plate,while the cathode-side fixture consisted of four metal blocks and three insulating mica sheets.Amodel RD2-12-10 electric heating furnace(Zhongyang Co.,China)was used to heat at a rate of 1℃/min to 720℃,and then the temperature was maintained.The current-voltage characteristics of the SOFC were measured by a model Kikusui PLZ664WA DCelectronic load.The voltage signals from various regions were measured by a model JC-9600B/8 multi-channel voltmeter(Jiangsu Jiechuang Technology Co.,Ltd.,China).The electrochemical impedance spectroscopic tests were conducted by a model Zennium electrochemical workstation(Zahner Co.,Germany)with a frequency range from 0.1 Hz to 100 kHz.The microstructure of the samples was measured using a model FESEM SU-8220 field emission scanning electron microscope(Hitachi Co.,Ltd.,Japan).An one-dimensional numerical model was constructed via the FORTRAN languag

关 键 词：固体氧化物燃料电池 集流体 接触电阻 分割电池 水平电流 

分 类 号：TM911.4[电气工程—电力电子与电力传动]