Pt/CS复合纳米颗粒的结构表征

采用化学气相沉积(CVD)法制备得到纳米碳微球(CS),采用浸渍还原法合成了Pt/CS纳米颗粒。电镜观察表明颗粒具有光滑的表面,其平均粒径在300nm左右,同时在产物中没有观察到纳米管和其它杂质。从HRTEM表征结果得出CS上的Pt颗粒分散均匀,直径分布在3～4nm之间。表明在溶液中使用Pt/CS催化剂时Pt颗粒可以均匀的分散于CS表面。在催化剂中Pt的含量为18%。这种较为理想的Pt/CS颗粒分布结果有利于其在燃料电池电极中的电催化作用。

Structure Characterization of Pt/CS Composite Nanoparticies

Carbon spheres(CS) were synthesized by traditional method-chemical vapor deposition (CVD), with a novel precursor-asphaltene. Pt/CS composite nanopaticles were prepared by the method of impregnation reduction. The structure images show the CS particles with quite smooth surface were dispersed with an average diameter of ca.300 nm, without nanotubes and others. SEM image of Pt particles were on the CS from 3~4 nm. This implies that the Pt particles tended to disperse homogeneously on the surface of CS when the Pt/ CS catalyst had been prepared in the solution. Pt content in the catalysts was 18% for Pt/CS. So the size distribution of Pt/CS was in the ideal range to get a good performance of the catalyst in fuel cells electrodes.