物理化学学报 >> 2015, Vol. 31 >> Issue (2): 302-308.doi: 10.3866/PKU.WHXB201412031

电化学和新能源 上一篇    下一篇

Pt/TiO2纳米纤维的制备及其对甲醇的电催化氧化活性

陈红, 王诗贤, 赵万隆, 章能能, 郑颖平, 孙岳明   

  1. 东南大学化学化工学院, 南京 211189
  • 收稿日期:2014-09-18 修回日期:2014-12-03 发布日期:2015-01-26
  • 通讯作者: 郑颖平, 孙岳明 E-mail:ypz_99@163.com;sun@seu.edu.cn
  • 基金资助:

    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)及江苏省工业支撑项目(BE20130118)资助

Preparation of Pt/TiO2 Nanofibers and Their Electrocatalytic Activity towards Methanol Oxidation

CHEN Hong, WANG Shi-Xian, ZHAO Wan-Long, ZHANG Neng-Neng, ZHENG Ying-Ping, SUN Yue-Ming   

  1. College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
  • Received:2014-09-18 Revised:2014-12-03 Published:2015-01-26
  • Contact: ZHENG Ying-Ping, SUN Yue-Ming E-mail:ypz_99@163.com;sun@seu.edu.cn
  • Supported by:

    The project was supported by the National Program on Key Basic Research Project, China (973) (2013CB932902), National Natural Science Foundation of China (21173042), Scientific and Technological Achievements Transformation Special Foundation of Jiangsu Province, China (BA2014069), and Industrial Supporting Project Foundation of Jiangsu Province, China (BE20130118).

摘要:

采用静电纺丝技术结合还原浸渍法制备了Pt/TiO2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, TiO2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TiO2纳米纤维的表面, 且Pt 颗粒大小较均一, 平均粒径为4.0 nm, Pt/TiO2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/TiO2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.

关键词: 静电纺丝, 二氧化钛纳米纤维, Pt纳米颗粒, 甲醇, 催化氧化

Abstract:

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.

Key words: Electrospinning, TiO2 nanofiber, Pt nanoparticle, Methanol, Catalytic oxidation

MSC2000: 

  • O646