高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (9): 1801.doi: 10.7503/cjcu20150009

• 物理化学 • 上一篇    下一篇

Pd-Ag/C@TiO2核壳结构纳米棒阵列的制备及对NaBH4电氧化的催化性能

闫鹏1,2, 张栋铭1, 程魁1, 徐阳1, 李莹莹1, 叶克1, 曹殿学1, 王贵领1()   

  1. 1. 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001
    2. 黑龙江工程学院材料与化学工程学院, 哈尔滨 150001
  • 收稿日期:2015-01-05 出版日期:2015-09-10 发布日期:2015-08-21
  • 作者简介:联系人简介: 王贵领, 男, 博士, 教授, 博士生导师, 主要从事化学电源研究. E-mail:wangguiling@hrbeu.edu.cn
  • 基金资助:
    中央高校基本科研业务费学生科技创新计划项目(批准号: HEUCFS2014)资助

Preparation of Pd-Ag/C@TiO2 Core/shell Nanorods as Catalysts for Electrooxidation of NaBH4

YAN Peng1,2, ZHANG Dongming1, CHENG Kui1, XU Yang1, LI Yingying1, YE Ke1, CAO Dianxue1, WANG Guiling1,*()   

  1. 1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
    2. College of Materials and Chemical Engineering, Heilongjiang Institute of Technology, Harbin 150001, China
  • Received:2015-01-05 Online:2015-09-10 Published:2015-08-21
  • Contact: WANG Guiling E-mail:wangguiling@hrbeu.edu.cn

摘要:

通过热蒸发结合恒电位沉积法制备了具有核壳结构的Pd-Ag/C@TiO2催化剂. 利用X射线衍射仪(XRD)、 扫描电子显微镜(SEM)和透射电子显微镜(TEM)等对所制备样品的形貌和结构进行了表征, 利用线性伏安扫描和计时电流技术研究了Pd-Ag/C@TiO2电极对NaBH4的电氧化性能. 结果表明, Pd-Ag/C@TiO2电极具有三维纳米核壳结构, 在电化学反应过程中有利于燃料与催化剂充分接触. 催化剂中Pd与Ag的原子比为0.37∶0.17的Pd-Ag(2∶1)/C@TiO2催化剂的效果最佳, 在3.0 mol/L NaOH+0.20 mol/L NaBH4溶液中电流密度达到672 mA/cm2, 在1200 s 测试时间内计时电流曲线衰减很小, 说明该Pd-Ag/C@TiO2电极对NaBH4电氧化具有很高的电化学活性和稳定性.

关键词: 直接硼氢化物燃料电池, Pd-Ag催化剂, 核壳结构纳米棒, NaBH4电氧化

Abstract:

Pd-Ag/C@TiO2 core/shell nanorods catalysts were prepared via a thermal evaporation method followed by constant potential electrodeposition. The catalysts were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM) and transmission electron microscope(TEM). The catalytic performance of the obtained electrodes for NaBH4 electrooxidation was evaluated by means of linear scan voltammetry and chronoamperometry. The results show that the as-prepared Pd-Ag/C@TiO2 electrode owns special three dimensional(3D) core/shell structure, which is of benefit to the diffusion of the fuel and the contact between catalyst and fuel during the electrochemical reaction. The performance of Pd-Ag(2∶1)/C@TiO2 core/shell nanorods with a Pd/Ag atomic ratio of around 0.37∶0.17 is the best, of which a current density of 672 mA/cm2 in the solution containing 3.0 mol/L NaOH+0.20 mol/L NaBH4 was obtained. The chronoamperometric current densities remain nearly constant within a 1200 s test. The results indicate that Pd-Ag(2∶1)/C@TiO2 core/shell nanorods has considerable electrochemical activity and stability for NaBH4 electrooxidation.

Key words: Direct borohydride fuel cell, Pd-Ag catalyst, Core/shell nanorods, NaBH4 electrooxidation

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