Ni modified ceramic anodes for solid oxide fuel cells

作者：Xiao Guoliang; Jin Chao; Liu Qiang; Heyden Andreas; Chen Fanglin^*

来源：Journal of Power Sources, 2012, 201: 43-48.

DOI：10.1016/j.jpowsour.2011.10.103

• Solid oxide fuel cells
• Perovskite oxides
• Ni
• Impregnation

Ni modified Sr2Fe1.5Mo0.5O6 (SFM) and La0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) anodes have been studied as anode materials for solid oxide fuel cells (SOFCs). Temperature-programmed reduction (TPR) results show that Ni promotes the oxidation of H-2 on SFM. As a result, a cell with Ni-SFM as the anode, La0.8Sr0.2Ga0.83Mg0.17O3 (LSGM) as the electrolyte, and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) as the cathode shows a high peak power density of 1166 mW cm(-2) at 800 degrees C using H-2 as the fuel and ambient air as the oxidant. Ni modified SFM also shows enhanced performance in CH4 (with 3 vol% H2O). Compared with SFM, Ni-SFM anode demonstrates enhanced catalytic activity, resulting in higher open-circuit voltage and lower electrode polarization resistance in CH4. However, due to the presence of Ni, the sulfur tolerance of these Ni-modified anodes is still low. The cell performance drops by almost 18% after the cell with Ni-SFM anode has been operating for 20 h in a fuel of H-2 with 100 ppm H2S at 800 degrees C. However, the cell performance can be fully recoverable upon removal of H2S from the fuel stream. Similar cell performance improvements have also been observed on cells with Ni modified LSCM anodes. The cells with the Ni-LSCM anodes have shown relatively stable performance during the short-term durability test at 800 degrees C in CH4 at 800 degrees C.

• 出版日期2012-3-1
• 单位苏州大学