PtMo合金催化剂氧还原反应催化性能研究

Study on the catalytic performance of PtMo alloy catalyst for oxygen reduction reaction

采用乙二醇还原法和后续的热处理工艺制备了Pt-Mo合金催化剂。使用透射电子显微镜、X射线衍射、电感耦合等离子体发射光谱、X射线光电子能谱等方法对样品进行了形貌、结构和组分的表征。通过电化学测试方法,探究了不同催化剂的电催化活性和稳定性。结果表明:合适的热处理温度不仅提高了Pt-Mo纳米颗粒的合金化程度,而且改变了催化剂颗粒表面的电子结构和成分。所以,经过400℃热处理的PtMo/C-400催化剂表现出较好的氧还原性能,其电催化活性和稳定性均与商业J01-Pt/C催化剂相当。

A PtMo alloy catalyst was prepared by ethylene glycol reduction and subsequent heat treatment.The morphology,structure and composition of the samples were characterized by transmission electron microscope,X-ray diffraction,inductively coupled plasma optical emission spectrometry and X-ray photoelectron spectroscopy.The electrocatalytic activity and stability of different catalysts were investigated by electrochemical testing.The experimental results showed that the appropriate heat treatment temperature not only improved the alloying degree of Pt-Mo nanoparticles,but also changed the electronic structure and composition of the catalyst particle surface.Therefore,after heat treatment at 400℃,the optimized catalyst PtMo/C-400exhibited good oxygen reduction performance,and its electrocatalytic activity and stability were comparable to those of commercial J01-Pt/C catalyst.