【摘要】 通过阴离子聚合物聚苯乙烯磺酸钠（PSS）对碳纳米管（CNTs）进行非共价功能化修饰得到PSS功能化的碳纳米管（PSS-CNTs）,利用带负电的PSS和Ce3+之间的静电作用将Ce3+组装到CNTs表面,再利用Ce3+与Pt Cl2-4之间存在的静电作用和氧化还原反应实现CeO₂和Pt纳米粒子在CNTs表面的原位沉积,得到复合催化剂Pt-CeO₂/PSS-CNTs.采用透射电子显微镜（TEM）、X射线衍射仪（XRD）、能谱仪（EDS）及拉曼光谱仪（Raman）等对催化剂进行了表征.电化学性能测试结果表明,由于PSS-CNTs表面原位沉积的Pt纳米粒子相对于在原始CNTs上沉积的Pt纳米粒子具有更小的粒径、更好的分散均匀性和稳定性,同时Pt与CeO₂之间存在良好的协同效应,Pt-CeO₂/PSS-CNTs催化剂对甲醇电催化氧化具有较好的催化活性和化学稳定性,当nPt/nCe=2/3时催化性能最优.更多还原

【Abstract】 Carbon nanotubes（ CNTs） were noncovalently modified by anionic polymer poly（ sodium-4-styrenesulfonate）（ PSS） to obtain PSS functionalized CNTs（ PSS-CNTs）,and then Ce3+was assembled to CNTs surface through the electrostatic interaction between electropositive Ce3+and electronegative PSS. Through the electrostatic interaction and oxidation-reduction reaction between Ce3+and Pt Cl2-4,CeO₂ and Pt nanoparticles were in-situ deposited on the surface of CNTs to obtain PSS-CNTs supported Pt-CeO₂ composite catalyst（ Pt-CeO₂/PSS-CNTs）. The structure, component and micromorphology of Pt-CeO₂/PSS-CNTs were characterized by transmission electron microscopy（ TEM）,X-ray diffraction（ XRD）,X ray photoelectron spectroscopy（ XPS）,energy dispersive X-ray spectroscopy（ EDS） and Raman spectroscopy,respectively. The electrochemical study shows that,due to the smaller particle size,the better dispersion uniformity and stability of Pt nanoparticles in-situ deposited on the surface of PSS-CNTs compared with those on the original CNTs,and the synergetic effect between Pt and CeO₂,Pt-CeO₂/PSS-CNTs,especially Pt-CeO₂/PSS-CNTs with nPt/nCeof 2/3,exhibits higher catalytic activity and stability for methanol electrooxidation compared with Pt-CeO₂/CNTs and PtRu/C.更多还原