采用大气压介质阻挡放电辅助氢气热还原方法和氢气热还原方法制备Pt/C催化剂,考察了制备方法及Pt负载量对Pt/C催化性能的影响。采用X-射线衍射( XRD)、循环伏安法、CO催化氧化反应研究Pt/C催化剂的晶相结构、电催化性能和CO催化氧化活性。结果表明:大气压介质阻挡放电辅助氢气热还原所制备的样品具有更高的电化学活性和CO催化氧化活性。当Pt负载量在2%到10%之间变化时,Pt/C-PC催化活性随负载量增加而增加。 XRD测试结果显示当Pt负载量为2%,5%和10%时,Pt粒径分别为:10.6 nm,9.1 nm和6.4 nm,说明采用等离子体辅助氢气热还原方法制备的Pt/C-PC催化剂,Pt负载量越大,Pt粒径越小,CO催化氧化活性更高。
In this study, Pt/C catalysts were prepared by plasma assisted thermal reduction method and thermal reduction method, and the influences of preparation method and Pt loading amount on the performance of Pt/C catalysts were exam-ined. X-ray diffraction ( XRD) , cyclic voltammetry, CO catalytic oxidation was adopted to investigate the crystal structure, electro-catalytic performance and CO catalytic oxidation activity of Pt/C catalyst. The results showed that the Pt/C catalysts prepared by plasma assisted thermal reduction method exhibited higher electrochemical activity and CO catalytic oxidation activity. When the Pt loading amount was in the range of 2% and 10%, the catalytic activity of Pt/C-PC increased with the increase of Pt loading amount. XRD results showed that particle size the Pt in 2%, 5% and 10% Pt/C catalysts were 10. 6 nm, 9. 1 nm and 6. 4 nm. This indicated that Pt/C catalysts prepared by plasma assisted thermal reduction method exhib-ited smaller size of Pt when Pt loading amount was larger, and therefore exhibited higher CO catalytic oxidation activity.