中文摘要：

用铬作掺杂元素，通过液相均相沉淀——气／固高温还原两段反应方法制备了碳载Pt—Cr合金催化剂，采用热分析方法（TG—DSC）、扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）技术测试了合金催化剂的晶体结构和表面形貌。结果表明，用VulcanXC-72作载体，N（Pt）：N（Cr）为1：1，热处理温度为950℃，催化剂的电化学活性表面积最大，催化活性最好。在电解液为0．5mol／dm。硫酸溶液和2mol／dm。甲醇／硫酸溶液中用循环伏安法测试，自制的碳载Pt—Cr合金催化剂比商业Pt／C催化剂甲醇氧化活性低，因为Cr的存在，降低了Pt活性点旁三个相邻Pt存在的概率，从而降低了甲醇的氧化活性。

英文摘要：

Carbon-supported Pt-Cr alloy catalysts were prepared by two-step reaction containing liquid depositing and gas-solid reducing. The physical property of the alloy catalysts was tested by TG and DSC, SEM and XRD techniques. The results show that when Vulcan XC-72 is used as carrier, the Pt ： Cr atomic ratio is 1 ： 1, and heat-temperature is 950℃, it has preferable catalytic characteristic and the largest electrochemical surface. In 0.5 mol/dm^3 H2SO4 and 2 mol/dm^3 CH3OH/H2SO4 solutions , alloy electrocatalysts are less active than the commertial Pt/C for methanol oxidation, this is attributed to its low activity for methanol oxidation due to the smaller probability for presenting three Pt neighboring Pt active site.