Investgation Of Preparation And Performance On Anode Of IT-H₂S-SOFC

Solid oxide fuel cell is a highly efficient clean energy. The anode is an important part of SOFC. Ni-YSZ is commonly used as anode material, the material has a serious problem of sulfur poisoning. Therefore, the development of new high performance sulfur-resistant anode materials to reduce costs and promote the commercialization of SOFC process is important.In this paper, the basic properties of Ni-SDC composite anode, La0.7Sr0.3Cr1-xYx03-δand La0.7Sr0.3Cr1-xMxO3-δ(M=Mn, Co, Mo, V, W) anode were studied, and whether they can be regarded as sulfur-resistant anode material.NiO-SDC powder was successfully prepared by sol-gel method, after calcinating at 800℃and reducting at 850℃, the composite Ni-SDC anode powder was gotten. XRD and SEM results shows that they have good crystals and particle size distribution. By comparing XRD, Raman spectroscopy before and after exposure to H2S and thermodynamic software analysis, study the chemical reactions that Ni and Ce may occur.Different doping ratio La0.7Sr0.3Cr1-xYxO3-δ(x=0.10,0.13,0.15,0.17,0.20) were prepared by urea combustion method, and their performance were ealuated. Study the effect of doping ratio on the results of XRD, SEM, TPR and conductivity. The results shown x=0.13 is the best. Anode materials La0.7Sr0.3Cr0.87Y0.13O3-δ(LSCY) for SOFC were synthesized by EDTA-citrate complexing method. The results of TG-DSC, XRD and SEM show that the sintering temperature decrease from 1350℃to 1000℃. Thermodynamic analysis shows that increasing the operating temperature and the partial pressures of oxygen (po2) could improve the resistance to sulfur. By comparing XRD, FT-IR spectroscopy before and after exposure to H2S, it was found that the anode was sulfur-tolerant.The H2-H2S-SOFC battery performance shows that when the total fuel gas flow was 100OmL·min-1, the maximum power density and the maximum current density were 12.2mW·cm-2and 45.1mA·cm-2.La0.7Sr0.3Cr1-xMxO3-δ(M=Mn, Co, Mo, V, W) were prepared by urea combustion method. The results of XRD and Raman show that La0.7Sr0.3Cr0.5Mn0.5O3-δand La0.7Sr0.3Cr0.5V0.5O3-δhave good perovskite crystal, and a certain resistance to sulfur tolerance. Both of them have good conductivity. At 800℃, the maximum power density were 2.1mW·cm-2 and 0.65 mW·cm-2 and the maximum current density were 10.0mA·cm-2 and 2.6mA·cm-2.