具有优异甲醇催化氧化性能的Pt/MoO3-WO3/CNTs催化剂

以聚二烯丙基二甲基胺盐酸盐(PDDA)为连接剂,采用原位自组装方式将MoO3和WO3负载到碳纳米管(CNTs)上,然后通过乙二醇还原法负载Pt纳米颗粒,得到Pt纳米颗粒均匀分布的Pt/MoO3-WO3/CNTs催化剂.当氧化物总量控制在10 wt%,MoO3与WO3摩尔比为1:0.5时,Pt/MoO3-WO3/CNTs催化剂催化甲醇氧化活性最高,甲醇氧化峰电流If高达835 A/gPt.WO3和MoO3的加入提高了催化剂的甲醇氧化活性、抗CO中毒能力和稳定性,使得Pt/MoO3-WO3/CNTs催化剂表现出优异的甲醇电催化氧化性能.

Pt/MoO3-WO3/CNTs catalyst with excellent performance for methanol electrooxidation

A composite Pt-based catalyst was prepared by loading MoO₃ and WO₃ nanoparticles onto carbon nanotubes (Pt/MoO₃-WO₃/CNTs). There was a uniform nanoparticle distribution with small particle sizes. This was achieved through an in situ self-assembly method using poly(diallyldimethylammo- nium chloride) as a linker and through subsequent immobilization of the Pt using ethylene glycol as a reducing agent. The total amount of oxide in the CNTs was 10 wt%, and when the molar ratio of MoO₃ to WO₃ was 1:0.5, Pt/MoO₃-WO₃/CNTs showed the highest activity for the electrocatalytic oxidation of methanol with forward peak current of 835 A/gPt. Because MoO₃ and WO₃ improve the electrocatalytic activity for methanol, CO oxidation ability, and the durability of the catalyst, the Pt/MoO₃-WO₃/CNTs catalyst exhibited excellent performance for the electrocatalytic oxidation of methanol.