金属支撑型固体氧化物燃料电池制备及性能研究

发布时间：2018-05-24 01:08

本文选题：固体氧化物燃料电池 + 金属支撑　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：固体氧化物燃料电池(SOFC)技术是非常有竞争力的绿色发电技术,然而传统SOFC材料相对高昂的制造成本及电池封装工艺的不可靠,仍然阻碍着SOFC的商业化进程。将SOFC运行温度降至中低温是解决目前问题的重要途径,当电池操作温度降低至中低温时,SOFC的支撑体及连接体便可以采用低成本的不锈钢金属材料。金属支撑型SOFC具有价格低廉、抗热冲击性能优越、抗氧化还原性能好、便于加工、封装容易等优点。微管式SOFC具有体积功率密度高、易封装等优点。我们首次提出金属支撑型微管式固体氧化物燃料电池这一全新的电池结构,兼具金属支撑和微管式SOFC的优点。本论文采用湿法流延工艺及干压浸渍涂敷工艺制备具有均匀燃料气通道的平板式金属支撑体。湿法共流延工艺制备的金属支撑体,通过调控流延浆料中造孔剂和有机物的配比,改进烧结程序,优化了金属支撑体的孔道结构,提高了金属支撑体的机械强度。干压法工艺流程简单,通过对金属支撑体进行预烧结改善了其烧结特性,其抗弯折强度达到144.72 N。本论文采用相转化法制备了具有双孔道结构的微管式金属支撑体,研究了纺丝压力、固含量对金属微管形貌的影响,得到了优化的工艺参数,相较于传统阳极支撑微管,其机械强度提高了40%。本论文采用溶胶凝胶法制备了Sr_(2-x)Ca_xFe1.5Mo_(0.5)O6-δ(SCFM)系列阴极材料,研究表明Ca掺杂量为0.1~_(0.5)时,SCFM在高温还原气氛下具有良好的稳定性。Sr1.5Ca_(0.5)Fe1.5Mo_(0.5)O6-δ阴极材料具有最高的电导率,500 oC下空气中达到11.69S·cm-1。该阴极材料与传统的电解质材料均具有良好的化学相容性,通过A位Ca2+掺杂,降低了该电极材料的热膨胀系数,与SFM相比,Ca掺杂后材料具有更好的电化学性能,750 oC时极化阻抗降低至0.18Ω·cm2,阴极材料在氧化气氛和还原气氛下还具有优异的热稳定性。为了进一步优化阴极性能,采用机械混合法制备SCFM-SDC阴极,复合40 wt%氧离子导体GDC后,750 oC时极化阻抗进一步降低至0.17Ω·cm2。
[Abstract]:Solid oxide fuel cell (SOFC) technology is a very competitive green power generation technology. However, the relatively high manufacturing cost of traditional SOFC materials and the unreliability of battery packaging technology still hinder the commercialization of SOFC. Lowering the operating temperature of SOFC to medium and low temperature is an important way to solve the current problem. When the operating temperature of SOFC is reduced to medium and low temperature, the support and connectors of SOFC can be made of low cost stainless steel metal materials. Metal-supported SOFC has the advantages of low price, excellent thermal shock resistance, good oxidation resistance and reduction performance, easy processing and easy package. Microtube SOFC has the advantages of high bulk power density and easy encapsulation. For the first time, we present a novel structure of metal-supported microtube-type solid oxide fuel cell (SOFC), which has the advantages of both metal-supported and microtube-type SOFC. In this paper, a plate metal support with uniform fuel gas channel was prepared by wet casting and dry pressure impregnation coating. By adjusting the ratio of pore-forming agent and organic matter in the casting slurry, the sintering procedure was improved, the pore structure of metal support was optimized and the mechanical strength of metal support was improved. The dry pressing process is simple and the sintering characteristics of the metal support are improved by pre-sintering. The flexural strength is up to 144.72 N. In this paper, microtube metal supports with double pore structure were prepared by phase inversion method. The effects of spinning pressure and solid content on the morphology of metal microtubules were studied. The optimized technological parameters were obtained, compared with the traditional anode supported microtubules. Its mechanical strength has increased by 40%. In this paper, a series of cathode materials of SrStue 2-xCaX Cax Fe 1.5MoO 0.5O 6- 未 SCFM have been prepared by sol-gel method. The results show that SCFM has good stability in the atmosphere of high temperature reduction. The cathode material has the highest conductivity of 500oC and the highest conductivity of 11.69s cm-1in the air. The cathode material has good chemical compatibility with the traditional electrolyte material, and the thermal expansion coefficient of the electrode material is reduced by doping with A-site Ca2. Compared with SFM, Ca-doped materials have better electrochemical performance and lower polarization impedance to 0.18 惟 cm ~ 2 at 750oC. The cathode materials also have excellent thermal stability in oxidation and reduction atmospheres. In order to further optimize the cathode performance, the SCFM-SDC cathode was prepared by mechanical mixing method. The polarization impedance of 40 wt% oxygen ion conductor GDC was further reduced to 0.17 惟 cm 2 at 750oC.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM911.4

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