Pt/MO_(x)/N-CNTs(M=Ce、Ti、Sn)电催化剂的制备及其甲醇氧化性能研究

Preparation of Pt/MO_(x)/N-CNTs(M=Ce,Ti or Sn)electrocatalysts and study on their performances in methanol oxidation

以聚吡咯碳化得到的氮掺杂碳纳米管(N-CNTs)为载体,采用一步法原位生长Pt和金属氧化物(MO_(x),M为Ce、Ti、Sn)纳米颗粒,制备了Pt/MO_(x)/N-CNTs电催化剂。通过对其进行表征,考察了Pt/MO_(x)/N-CNTs中不同MO_(x)结构特性对其甲醇电催化氧化活性的影响。结果表明,Pt/CeO_(2)/N-CNTs具有优异的甲醇电催化氧化活性[722 A/g(Pt)],分别是Pt/TiO_(2)/N-CNTs和Pt/SnO_(2)/N-CNTs的1.36和1.59倍。此外,CO溶出伏安曲线分析结果表明,抗CO中毒性能由强到弱依次是Pt/CeO_(2)/N-CNTs、Pt/TiO_(2)/N-CNTs和Pt/SnO_(2)/N-CNTs。通过对比不同Pt/MO_(x)/N-CNTs的结构特性和甲醇电催化氧化性能,为直接甲醇燃料电池的工业化应用提供基础。

Nitrogen-doped carbon nanotubes(N-CNTs)prepared by carbonization of polypyrrole nanotubes(PPy-NTs)are used as carrier,Pt/MO_(x)/N-CNTs electrocatalysts are successfully prepared by one-step in-situ growth of both Pt and metal oxide(MO_(x),M=Ce,Ti or Sn)nanoparticles.Through a series of characterization,the effects of different structural characteristics of MO_(x) in Pt/MO_(x)/N-CNTs on the activity of catalyst in electrocatalytic oxidation of methanol are investigated systematically.The results show that Pt/CeO_(2)/N-CNTs has an excellent electrocatalytic activity for methanol oxidation[722 A/g(Pt)],which is 1.36 and 1.59 times that of Pt/TiO_(2)/N-CNTs and Pt/SnO_(2)/N-CNTs,respectively.In addition,the stripping voltammetry curve of CO shows that the order of anti-CO poisoning ability from strong to weak is Pt/CeO_(2)/N-CNTs,Pt/TiO_(2)/N-CNTs and Pt/SnO_(2)/N-CNTs.The structural characteristics and methanol electrocatalytic oxidation performance of different Pt/MO_(x)/N-CNTs are compared,which provides a basis for the industrial application of direct methanol fuel cells.