Synergy between isolated-Fe₃O₄ nanoparticles and CN_x layers derived from lysine to improve the catalytic activity for oxygen reduction reaction

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• 作者：Huijuan Yang ; Hui Wang ; Shan Ji ; Vladimir Linkov ; Rongfang Wang
• 关键词：Iron oxide ; Nitrogen-doped carbon ; Lysine ; Oxygen reduction reaction
• 刊名：International Journal of Hydrogen Energy
• 出版年：6 March, 2014
• 年：2014
• 卷：39
• 期：8
• 页码：3739-3745
• 全文大小：1277 K

文摘

In order to seek heterogeneous electrocatalyst with efficient catalytic activity for oxygen reduction reaction (ORR), Fe₃O₄-CN_x composite reported in our previous work was studied as electrocatalyst for ORR and showed poor catalytic activity. To improve the catalytic activity, Fe₃O₄-CN_x composite is modified by the CN_x layers derived from lysine through pyrolysis. The physical characterization show that the coral-shaped morphology of the resultant composite (Fe₃O₄-CN_x-Lys) is still retained, while the degree of its graphitic crystalline increases. Besides, Fe₃O₄-CN_x-Lys has 364.7聽m²聽g^鈭? of surface area with hierarchical porous structure. Electrochemical tests show that the catalytic activity Fe₃O₄-CN_x-Lys for ORR is not only higher than those Fe₃O₄-CN_x, XC-72-Lys derived from lysine and XC-72 Vulcan carbon but also comparable to that of commercial Pt/C (20聽wt%).