相转化法制备锥管状阳极支撑固体氧化物燃料电池及其性能研究
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摘要
论文利用相转化法制备了锥管状阳极支撑体,预烧结后组装出了固体氧化物燃料电池(SOFC)单电池和电池组并进行了电化学测试。实验结果为:单电池在700 oC时开路电压为1.0 V,在800 oC时时最大功率密度达到410 m W / cm2;两个单电池串联电池组在650 oC时开路电压为1.85 V,800 oC时最大功率为1.45 W;三个单电池串联电池组的开路电压在600 oC时为2.65 V,在800 oC时的最大功率为1.52 W。
阻抗谱图分析显示:在单电池中,界面电阻占总电阻的大部分,优化电解质和电极的接触是下一步的工作目标;在电池组中,优化电池间的连接和提高单个电池的性能同一性是下步工作目标。
扫描电镜(SEM)分析显示:阳极和阴极均呈现出疏松多孔结构,满足作为电极的要求,与电解质层接触良好且有明显的接触界面。
论文研究了阳极支撑体的烧结过程并得出了合适的阳极烧结程序。比较了不同造孔剂对阳极支撑体微观结构的影响,认为在阳极支撑体中添加10 %的石墨造孔剂较佳。
作为一种阳极支撑型锥管状SOFC制备工艺,相转化工艺流程简单,制备出生坯强度高,是一种净尺寸成型工艺,非常利用串接;制备出来的阳极结构疏松多孔、有利于燃料气在其上的催化氧化,且组装出的单电池及电池组的欧姆电阻非常小,有十分广阔的发展前途。但要实现商业化应用,还有很长的路要走,需要解决阳极层的厚度控制以及阳极支撑体烧结时的变形问题。
In this paper, cone-shaped anode substrates were prepared by phase-inversion method and single cell and cell stack were prepared after sintering. The electrochemical analysis shows that: Single cell open circuit voltage (OCV) reach 1.0 V at 700 oC and its maximum power density was 410 m W / cm2 at 800 oC; two cells in series OCV reach 1.85 V at 650 oC and its maximum power was 1.45 W at 800 oC; three cells in series OCV reach 2.65 V at 600 oC and its maximum power was 1.52 W at 800 oC.
Impedance spectra analysis showed that: in single cell, most of the total resistance is interface resistance and optimization of electrolyte and electrode contact is the next target; in the power reactor, the next targets are optimization of connection between the batteries and to improve the performance of single-cell identity.
SEM analysis showed that both anode and cathode owned porous structure which met the requirements as electrode and they contacted well with electrolyte and a clear interface was found between them.
In the paper, anode substrates sintering process was researched and a suitable sintering process was given. Affect of different pore former on the anode microstructure was compared and to add 10 % graphite in the anode was a good choice.
As a technology to prepare cone-shaped anode-supported SOFC, the phase-inversion method has a bright future. The process is simple and greens have high strength. Stack was assembled easily because it is a nearly size molding process. Anode has a porous structure, which helps oxidation of the fuel gas. And ohmic resistances of single cell and stack are small. But to achieve commercial application, there is still a long way to go. The thickness of anode and sintering deformation control are two problems to be resolved at present.
阻抗谱图分析显示:在单电池中,界面电阻占总电阻的大部分,优化电解质和电极的接触是下一步的工作目标;在电池组中,优化电池间的连接和提高单个电池的性能同一性是下步工作目标。
扫描电镜(SEM)分析显示:阳极和阴极均呈现出疏松多孔结构,满足作为电极的要求,与电解质层接触良好且有明显的接触界面。
论文研究了阳极支撑体的烧结过程并得出了合适的阳极烧结程序。比较了不同造孔剂对阳极支撑体微观结构的影响,认为在阳极支撑体中添加10 %的石墨造孔剂较佳。
作为一种阳极支撑型锥管状SOFC制备工艺,相转化工艺流程简单,制备出生坯强度高,是一种净尺寸成型工艺,非常利用串接;制备出来的阳极结构疏松多孔、有利于燃料气在其上的催化氧化,且组装出的单电池及电池组的欧姆电阻非常小,有十分广阔的发展前途。但要实现商业化应用,还有很长的路要走,需要解决阳极层的厚度控制以及阳极支撑体烧结时的变形问题。
In this paper, cone-shaped anode substrates were prepared by phase-inversion method and single cell and cell stack were prepared after sintering. The electrochemical analysis shows that: Single cell open circuit voltage (OCV) reach 1.0 V at 700 oC and its maximum power density was 410 m W / cm2 at 800 oC; two cells in series OCV reach 1.85 V at 650 oC and its maximum power was 1.45 W at 800 oC; three cells in series OCV reach 2.65 V at 600 oC and its maximum power was 1.52 W at 800 oC.
Impedance spectra analysis showed that: in single cell, most of the total resistance is interface resistance and optimization of electrolyte and electrode contact is the next target; in the power reactor, the next targets are optimization of connection between the batteries and to improve the performance of single-cell identity.
SEM analysis showed that both anode and cathode owned porous structure which met the requirements as electrode and they contacted well with electrolyte and a clear interface was found between them.
In the paper, anode substrates sintering process was researched and a suitable sintering process was given. Affect of different pore former on the anode microstructure was compared and to add 10 % graphite in the anode was a good choice.
As a technology to prepare cone-shaped anode-supported SOFC, the phase-inversion method has a bright future. The process is simple and greens have high strength. Stack was assembled easily because it is a nearly size molding process. Anode has a porous structure, which helps oxidation of the fuel gas. And ohmic resistances of single cell and stack are small. But to achieve commercial application, there is still a long way to go. The thickness of anode and sintering deformation control are two problems to be resolved at present.
引文
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