A new fuel cell electrocatalyst based on carbonized polyacrylonitrile foam - The nature of platinum-support interactions

被引:57
作者
Ye, SY [1 ]
Vijh, AK [1 ]
Dao, LH [1 ]
机构
[1] INST RECH HYDRO QUEBEC,VARENNES,PQ J3X 1S1,CANADA
关键词
D O I
10.1149/1.1837369
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) have been conducted on a new fuel cell electrocatalytic material based on a highly porous carbonized polyacrylonitrile (PAN) microcellular foam with very low platinum loading (similar to 13 to 23 mu g cm(-2)). TEM images of this material clearly show the existence of nanometer size platinum particles which are homogeneously distributed in the highly porous carbonized PAN matrix. An XPS study of Pt-loaded PAN indicates that C 1s, O 1s, and N 1s peaks shift to lower binding energies, compared to virgin PAN. It was concluded that special metal-support interaction exists, through the formation of a charge-transfer complex between platinum and pyridine-type nitrogen atoms of PAN support. This interaction leads to the enhancement of the catalytic activity, and the improvement of the long-time stability of this electrocatalyst.
引用
收藏
页码:90 / 95
页数:6
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