Development of highly active and durable Pt based anode materials with higher utilization of Pt is quite crucial towards the commercial viability of direct methanol fuel cells (DMFCs). Herein, multi-walled carbon nanotube supported Pt_xIr nanostructures (Pt_xIr/MWCNT) are successfully prepared by one-pot wet chemical reduction without any surfactants. The role of Ir content and its bi-functional mechanism on kinetics of methanol oxidation reaction (MOR) was studied. The MOR on Pt_xIr/MWCNT follows Langmuir-Hinshelwood mechanism by successive oxidative removal of CO. The co-existence of IrO₂ plays a vital role as catalytic promotor. Amongst, Pt₂Ir/MWCNT shows enhanced electrocatalytic activity (mass activity (MA), 933.3 mA/mg_Pt) and durability (13.8% loss of MA after 5000 potential cycles) thru the well-balanced electronic and bi-functional effects. This study implies that the optimized composition of Pt₂Ir/MWCNT exhibits efficient methanol oxidation and could be a potential catalyst for direct methanol fuel cells.

具有较高Pt利用率的高活性耐用Pt基负极材料的开发对于直接甲醇燃料电池（DMFC）的商业可行性至关重要。本文中，通过一锅湿式化学还原法在没有任何表面活性剂的情况下成功地制备了多壁碳纳米管负载的Pt _x Ir纳米结构（Pt _x Ir / MWCNT）。研究了铱含量及其双功能机理对甲醇氧化反应动力学的影响。通过连续氧化去除CO ，Pt _x Ir / MWCNT上的MOR遵循Langmuir-Hinshelwood机理。IrO ₂的共存起着催化促进剂的作用。其中，Pt ₂Ir / MWCNT通过良好平衡的电子和双功能效应，显示出增强的电催化活性（质量活性（MA），933.3 mA / mg _Pt）和耐久性（MA在5000个潜在循环后损失13.8％）。这项研究表明，Pt ₂ Ir / MWCNT的最佳组成表现出有效的甲醇氧化作用，并且可能成为直接甲醇燃料电池的潜在催化剂。