应用柠檬酸钠络合还原法制备了粒径小、分布均匀的碳载Pd纳米粒子(Pd/C).由于柠檬酸钠的络合作用,有效地降低了Pd粒子在形成过程中的团聚.经过简单的热处理调控Pd粒子大小,发现随热处理温度的升高,Pd粒子直径由初始的2.7 nm增大到5.8 nm左右.电化学测试表明Pd/C的Pd粒子尺寸越小,电催化甲酸氧化的质量比活性越高,但如当Pd粒径较大,则催化剂呈现出更高的面积比活性.Pd粒径为3.6 nm的催化剂,其电催化甲酸氧化的稳定性最好. Pd nanoparticles with small size and uniform distribution were prepared by the sodium citrate complex reduction method, and Pd nanoparticles were effectively reduced due to the complexation of sodium citrate. After simple heat treatment to control the size of Pd particles, it was found that with the increase of heat treatment temperature, the diameter of Pd particles increased from initial 2.7 nm to 5.8 nm.The electrochemical measurements showed that the smaller the Pd particle size of Pd / C, the electrocatalytic formic acid oxidation The higher the specific activity of the catalyst, but the higher the specific activity of the catalyst when the Pd particle size is larger, the catalyst with Pd particle size of 3.6 nm has the best electrocatalytic formate oxidation stability.