Effect of Pd-impregnation on performance, sulfur poisoning and tolerance of Ni/GDC anode of solid oxide fuel cells

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• 作者：Lu Lu Zheng^a ; Xin Wang^a ; ^{wangxin@ntu.edu.sg} ; Lan Zhang^b ; Jing-Yuan Wang^c ; San Ping Jiang^d ; ^{s.jiang@curtin.edu.au}
• 关键词：Solid oxide fuel cells ; Sulfur tolerance ; Sulfur poisoning ; Ni/GDC anode ; Pd-impregnation ; Polarization performance stability
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：July, 2012
• 卷：37
• 期：13
• 页码：10299-10310
• 文件大小：1537 K

摘要

Sulfur tolerance of Ni/Gd₂O₃-CeO₂ (Ni/GDC) anodes promoted by impregnated palladium nanoparticles is investigated using the electrochemical impedance spectroscopy (EIS) and galvanostatic polarization techniques in the H₂-H₂S fuels at 800聽掳C. The anodes are alternately polarized in pure H₂ and H₂S-containing H₂ fuels with H₂S concentration gradually increased from 5 to 700聽ppm at 200聽mA聽cm^鈭?. The degradation in performance for the hydrogen oxidation in H₂S-containing H₂ fuels especially at low H₂S concentration is substantially smaller on Pd-impregnated Ni/GDC cermet anodes, as compared to that on pure Ni/GDC anodes. The potential of Pd-impregnated Ni/GDC electrodes measured in pure H₂ decreases by 0.07聽V after exposure to H₂S-containing H₂ fuels, substantially smaller than 0.13聽V observed on pure Ni/GDC anodes under identical test conditions. The results show that Pd impregnation significantly enhances the sulfur tolerance of Ni/GDC cermet anodes particularly in the low H₂S concentration range (e.g., <100聽ppm). The results indicate that the enhanced sulfur tolerance of Pd impregnated Ni/GDC anodes is most likely due to the promotion effect of impregnated Pd nanoparticles on the hydrogen dissociation and diffusion processes. The reduced moderation of the morphology and microstructure of the anodes in the presence of Pd nanoparticles may be the result of weaker interaction or adsorption of sulfur on Ni and GDC phases.