Carbon-Nb_0.07Ti_0.93O₂ composite supported Pt-Pd electrocatalysts for PEM fuel cell oxygen reduction reaction

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• 作者：Anna Ignaszak^a ; ¹ ; Chaojie Song^a ; ^{chaojie.song@nrc.gc.ca} ; Weimin Zhu^a ; Yan-Jie Wang^a ; ¹ ; Jiujun Zhang^a ; Alex Bauer^a ; Ryan Baker^a ; Vladimir Neburchilov^a ; Siyu Ye^b ; Stephen Campbell^c
• 关键词：Pt&ndash ; Pd alloys ; NbTiO2&ndash ; carbon composite support ; Oxygen reduction reaction ; Fuel cell catalysts
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 July, 2012
• 卷：75
• 期：Complete
• 页码：220-228
• 文件大小：1458 K

摘要

Carbon-Nb_0.07Ti_0.93O₂ (C_67 wt%-(Nb_0.07Ti_0.93O₂)_33 wt%) composite support for Pt_0.55Pd_0.45 alloy catalysts was prepared by hydrolysis of metal alkoxides in the presence of carbon. Physical characterization by XRD, EDX, BET, TEM and TGA showed that the Nb_0.07Ti_0.93O₂ was well distributed on the carbon particle surface with an average particle size of 15 nm, and this support has a high surface area of 176 m²/g and a similar porosity to that of carbon used to prepare this composite support. Pt_0.55Pd_0.45 alloy nanoparticles were deposited on the composite support to form a Pt_0.55Pd_0.45/C_67 wt%-(Nb_0.07Ti_0.93O₂)_33 wt% catalyst, which shows a higher catalytic activity toward ORR than those of monometallic counterpart Pt/C_67 wt%-(Nb_0.07Ti_0.93O₂)_33 wt%, Pt_0.55Pd_0.45/C, and Pt_0.55Pd_0.45/Nb_0.07Ti_0.93O₂. Pt_0.55Pd_0.45/C_67 wt%-(Nb_0.07Ti_0.93O₂)_33 wt% showed higher stability than Pt_0.55Pd_0.45/C, and similar to the commercially available Pt/C catalyst.