直接甲醇燃料电池阳极催化剂PtRu/SWCNTs的制备表征及其活性评价

Preparation,Characterization and Activity Estimation of Anode Catalyst PtRu/SWCNTs for Direct Methanol Fuel Cells

以单壁碳钠米管(SWCNTs)为载体,采用液相化学还原法制备了不同反应温度下的PtRu/SWCNTs(Pt和Ru的质量分数分别为20%和10%)甲醇阳极催化剂.通过X射线衍射(XRD)和数学模型考察和计算了PtRu/SWCNTs催化剂的粒径、晶格参数和表面积.利用循环伏安法对PtRu/SWCNTs(60℃)催化剂的电化学行为和活性进行了评价,并分别与商品PtRu/C(JM)和自制的PtRu/C(60℃)与PtRu/MWCNTs(60℃)催化剂进行了比较.结果表明,反应温度为60℃时,PtRu/SWCNTs催化剂具有较小的粒径和较大的表面积.在相同温度下,PtRu/SWC-NTs(60℃)催化剂比PtRu/C(JM)催化剂具有更低的峰值氧化电位,因而具有较好的甲醇氧化活性.

Methanol anode catalyst PtRu/SWCNTs （Pt20%和Ru10% in mass fraction） were prepared at different temperatures with single wall carbon nanometer tube （SWCNTs） as support by liquid - phase chemical reduction method. The diameters, lattice parameters and specific areas of the catalyst of PtRu/SWCNTs were investigated and calculated by XRD and mathematical models respectively. The electrochemical behaviors and activities of the catalyst PtRu/SWCNTs（60℃） were estimated by cyclic voltammetry method, which were compared with the commodity catalyst PtRu/C （JM） and self - prepared catalyst PtRu/C （60℃） and PtRu / MWCNTs （60℃） respectively. The results showed that the catalyst PtRu/SWCNTs prepared at 60℃ had smaller metal diameter and larger specific area. The peak value oxidation potential of the catalyst PtRu/SWCNTs（60℃）was lower than that of the catalyst PtRu/C （JM） at same temperature and so could make methanol oxidated more easily.