固体氧化物燃料电池阳极材料Ni-SDC的稳定性实验及热力学分析

Stability experiments and thermodynamic analysis of Ni-SDC anode for solid oxide fuel cells

以Ni-SDC作为固体氧化物燃料电池(SOFC)的阳极,研究了该阳极粉末在制备过程中以及5%H2S-N2硫化后的产物,并用热力学软件绘制相图对其在各种温度下的产物变化进行分析。结果表明:NiO-SDC在800℃煅烧和在850℃还原的产物与热力学分析结果是一致的。对比在5%的H2S-N2中硫化12 h前后的XRD表明Ni已经转化为NiS2,热力学分析验证了该结论。比较Ni-SDC和SDC硫化前后的Raman光谱和XRD结果得到:SDC硫化后主峰型没有发生明显变化,但强度变弱,说明粒径变大,可能因为有Ce—O—S键生成。

Ni-SDC as the anode materials for SOFC,the products in the preparation process and in 5% H2S-N2 was studied thermodynamically.The results show that the products of NiO-SDC sintered at 800 ℃ and reduction at 850 ℃ were consistent with the results of thermodynamic analysis.Compared with the XRD spectrums of Ni-SDC before and after exposure in 5% H2S-N2 at 800 ℃ for 12 h,Ni was converted to NiS2,which consented to the conclusion of thermodynamics.Compared with the Raman spectrums of Ni-SDC and SDC before and after exposure in 5% H2S-N2 at 800 ℃ for 12 h,a conclusion can be drawn that the main peaks is not changed but the intensity is diminished,the possible reason is the formation of Ce-O-S when the anode is exposed in a high concentration H2S.