物理化学学报 >> 2013, Vol. 29 >> Issue (05): 959-965.doi: 10.3866/PKU.WHXB201303042

电化学和新能源 上一篇    下一篇

直接乙醇燃料电池阳极催化剂Pt-Ir-SnO2/C的制备与表征

孙洪岩, 赵莲花, 余凤春   

  1. 延边大学理学院 化学系, 吉林 延吉 133002
  • 收稿日期:2012-11-23 修回日期:2013-03-04 发布日期:2013-04-24
  • 通讯作者: 赵莲花 E-mail:zhaolianhua@ybu.edu.cn
  • 基金资助:

    吉林省科技发展计划(20120741)资助项目

Preparation and Characterization of Pt-Ir-SnO2/C Anode Catalyst for Direct Ethanol Fuel Cell

SUN Hong-Yan, ZHAO Lian-Hua, Yu Feng-Chun   

  1. Department of Chemistry, College of Science, Yanbian University, Yanji 133002, China
  • Received:2012-11-23 Revised:2013-03-04 Published:2013-04-24
  • Supported by:

    The project was supported by the Science and Technology Project of Jilin Province, China (20120741).

摘要:

采用改良的Bönnemann法合成了一系列Pt/C、Pt-Ir/C、Pt-SnO2/C 和Pt-Ir-SnO2/C 阳极电催化剂. 利用X射线衍射(XRD)、透射电子显微镜(TEM)以及X射线光电子能谱(XPS)对催化剂晶型结构、表面形貌、粒径尺寸和表面电子结构进行了表征. 运用线性扫描伏安(LSV)、循环伏安(CV)和电流密度-时间(j-t)曲线进行电化学测试, 研究了温度对乙醇电催化氧化活性的影响. XRD和TEM结果表明, Pt 纳米粒子均为面心立方结构且分散较均匀, 平均粒径为2-4 nm. 电化学结果表明, 上述催化剂随着温度的升高催化性能增强, 在相同条件下,Pt-Ir-SnO2/C 催化剂的催化活性最佳. 通过阿仑尼乌斯公式计算结果得知, Ir 和Sn 的协同作用可以降低Pt-Ir-SnO2/C 催化剂对乙醇氧化反应的活化能.

关键词: 铂, 铱, 二氧化锡, 乙醇电氧化, 活化能, 直接乙醇燃料电池

Abstract:

Pt/C, Pt-Ir/C, Pt-SnO2/C, and Pt-Ir-SnO2/C anode electrocatalysts were prepared by an improved Bo? nnemann method. The crystal structure, surface morphology, particle size, and surface electronic structure were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). XRD and TEM revealed that Pt nanoparticles had a face-centered cubic structure, and that dispersions were relatively homogeneous with particle sizes of 2-4 nm. Electrocatalytic activities were characterized using linear sweep voltammetry (LSV), cyclic voltammetry (CV), and amperometric (j-t) curve techniques. Catalytic performance improved with increasing temperature, and catalytic activity of Pt-Ir-SnO2/C was optimal under these conditions. Arrhenius formula calculations showed that the synergy between Ir and Sn reduced the activation energy of Pt-Ir-SnO2/C catalysts for the oxidation of ethanol.

Key words: Platinum, Iridium, Stannic oxide, Ethanol electrooxidation, Activation energy, Direct ethanol fuel cell

MSC2000: 

  • O646