对称型固体氧化物燃料电池电极材料的制备及性能研究

发布时间：2018-04-23 09:37

  本文选题：对称型固体氧化物燃料电池 + 钙钛矿结构　； 参考：《南京理工大学》2017年硕士论文

【摘要】：固体氧化物燃料电池(SOFCs)是一种高效,清洁的能量转换装置,传统的SOFCs工作温度高,成本高都制约其商业化发展,所以发展中低温,低成本的新型电极材料迫在眉睫。而对称型SOFCs可有效的降低成本,且在阳极通过采用钙钛矿和类钙钛矿结构的电极材料,在还原气氛中有较高的抗积碳和抗硫毒化性能,但催化性能,导电率和稳定性都比传统阳极差。因此,高导电率和高催化活性的对称SOFCs电极材料的研究非常关键。本文将围绕对称型SOFCs的电极材料作系统的研究。本文设计并合成了中温La0.66Ca0.4Fe1-xNixO3-δ(x=0.4,0.6,0.8)(LCFN)的电极材料有着优异的氧化还原结构稳定性,较高的电导率和优秀的氧还原催化活性,且与Ceo.8Sm0.201.9(SDC)有良好的结构稳定性和化学兼容性。LCFN0.2的电导率在200S cm-1以上,LCFN0.2|SDC|LCFN0.2对称电池的极化阻抗在800℃为0.22Ω cm2。以LCFN0.2-30SDC为电极的对称电池的极化电阻在800℃为0.145Ωcm2,说明SDC的加入提高了对称电池的性能。LCFN0.2-30SDC单电池在800℃下的功率密度为141mWcm2,表明其确实是一种具有发展潜力的SOFCs电极候选材料。通过浸溃的方法制备电极来改善电极性能。LCFN中的铁镍元素在800℃下的还原气氛中从晶格中析出,主要以(γFe,Ni)的形式存在,将有效的提高阳极的氢气氧化催化性能。通过30SDC-infiltratedLCFN为电极制备对成型固体氧化物燃料电池,在800℃下的峰值功率密度为302 mW cm-2。在在800℃下,140h的长期测试后其PPD稳定在225 mWcm-2,且在随后的H2-air的循环气氛中保持这个数值。研究了类钙钛矿结构P2NiO4的电极材料在对称型SOFCs中的应用。该材料具有优异的氧化还原结构稳定性,较高的电导率和优越的电化学催化活性。其在还原气氛中还原后,通过XRD,SEM和EDS的分析,PNO中的部分Ni元素在还原气氛中会原位还原至PNO的骨架之上,这些纳米金属Ni颗粒均匀的依附在阳极骨架上,有效的提高了阳极对氢气氧化的催化性能。40SDC-infiltratedPNO对称电池的极化电阻在800℃为0.06Ωcm2,在800℃下的峰值功率密度为356mWcm-2。同时,在356mAcm-2的电流密度中,168h的氢气气氛中PPD保持稳定,并且该电池的热震性和氧化还原循环气氛实验中都保持着较好的稳定性,表明PNO也是是一种非常有发展潜力的对称型SOFCs电极候选材料。
[Abstract]:Solid-oxide fuel cell (SOFCs) is an efficient and clean energy conversion device. The high operating temperature and high cost of traditional SOFCs restrict its commercial development, so it is urgent to develop new electrode materials with low temperature and low cost. Symmetrical SOFCs can effectively reduce the cost, and by using perovskite and perovskite-like structure electrode materials, it has high resistance to carbon deposition and sulfur poisoning in reducing atmosphere, but has catalytic performance. The conductivity and stability of the anode are worse than those of the traditional anode. Therefore, the study of symmetric SOFCs electrode materials with high conductivity and high catalytic activity is very important. In this paper, the electrode materials of symmetric SOFCs are systematically studied. In this paper, the electrode materials of La0.66Ca0.4Fe1-xNixO3- 未 -0.4O0.40.6O0.8LCFN) have excellent redox structure stability, high conductivity and excellent catalytic activity for oxygen reduction, the electrode materials have been designed and synthesized at moderate temperature. The electrode materials of La0.66Ca0.4Fe1-xNixO3- 未 have excellent redox structure stability and excellent catalytic activity for oxygen reduction. It has good structural stability and chemical compatibility with Ceo.8Sm0.201.9SDC.The conductivity of LCFN0.2 is above 200s cm-1 and the polarization impedance of LCFN0.2 SDC LCFN0.2 symmetric cell is 0.22 惟 cm2 at 800 鈩，

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