摘要
采用静电纺丝技术结合还原浸渍法制备了Pt/TiO_2纳米纤维电催化剂,通过X射线衍射(XRD)分析、扫描电镜(SEM)、透射电镜(TEM)和X射线能谱(EDS)等测试手段对样品的晶相、形貌、微结构和化学组成进行了表征.测试结果表明,TiO_2纳米纤维为锐钛矿和金红石组成的混晶,Pt纳米颗粒均匀地分布于TiO_2纳米纤维的表面,且Pt颗粒大小较均一,平均粒径为4.0nm,Pt/TiO_2纳米纤维中Pt的质量分数约为20%.采用三电极体系的循环伏安和计时电流电化学分析方法研究了样品在酸性溶液中对甲醇的电催化氧化活性,结果表明,与负载相同质量分数Pt的Pt/P25和商业Pt/C催化剂相比较,Pt/TiO_2纳米纤维催化剂对甲醇呈现出较高的电催化氧化活性和更好的稳定性.
A Pt/TiO2 nanofiber catalyst has been prepared through the combination of an electrospinning technique with a reductive impregnation method. The compositions, morphologies and structures of the samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and energy dispersive spectroscopy （EDS）. The results showed that the crystal phase of the TiO2 nanofibers was composed of anatase and rutile TiO2. Pt nanoparticles were found to be uniformly distributed on the surface of the TiO2 nanofibers with an average size of 4.0 nm. The mass fraction of Pt in the Pt/TiO2 nanofiber catalyst was about 20%. The electrocatalytic activities of the samples towards the oxidation of methanol were measured by cyclic voltammetry and chronoamperometry using a three-electrode system in an acidic solution. Compared with Pt/P25 and commercial Pt/C catalysts containing the same quality percentage of Pt nanoparticles, the Pt/TiO2 nanofiber catalyst exhibited higher catalytic activity towards the oxidation of methanol and better stability.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2015年第2期302-308,共7页
Acta Physico-Chimica Sinica
基金
国家重点基础研究发展规划项目(973)(2013CB932902)
国家自然科学基金(21173042)
江苏省科技成果转化专项基金(BA2014069)
江苏省工业支撑项目(BE20130118)资助~~
