物理化学学报 >> 2011, Vol. 27 >> Issue (10): 2379-2384.doi: 10.3866/PKU.WHXB20110922

电化学和新能源 上一篇    下一篇

高性能核壳结构催化剂PdRu@Pt/CNT的制备

党岱1, 高海丽1, 彭良进1, 苏允兰2, 廖世军1, 王晔1   

  1. 1. 华南理工大学化学与化工学院, 广州 510641;
    2. 中国科学院化学研究所, 北京 100190
  • 收稿日期:2011-04-25 修回日期:2011-06-29 发布日期:2011-09-27
  • 通讯作者: 廖世军 E-mail:chsjliao@scut.edu.cn
  • 基金资助:

    全国大学生创新项目(081056118)和国家自然科学基金(20673040, 20876062, 21076089)资助

Preparation of High Performance Core-Shell PdRu@Pt/CNT Electrocatalyst

DANG Dai1, GAO Hai-Li1, PENG Liang-Jin1, SU Yun-Lan2, LIAO Shi-Jun1, WANG Ye1   

  1. 1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, P. R. China;
    2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2011-04-25 Revised:2011-06-29 Published:2011-09-27
  • Contact: LIAO Shi-Jun E-mail:chsjliao@scut.edu.cn
  • Supported by:

    The project was supported by the National University Student Innovation Program, China (081056118) and National Natural Science Foundation of China (20673040, 20876062, 21076089).

摘要: 采用两步沉积还原法制备了一种以PdRu合金为核、以铂为壳, 以碳纳米管(CNT)为载体的核壳结构低铂催化剂PdRu@Pt/CNT. 该催化剂对于甲醇催化氧化的单位质量铂的活性可达自制20% Pt/CNT 催化剂的1.7 倍, 且其正扫和反扫峰的峰电流密度之比(If/Ib)高达2, 是Pt/CNT 催化剂If/Ib值的2 倍, 表明通过将活性组分铂分散在PdRu核上, 有效地提高了金属铂的分散度和铂的利用率, 且通过壳层铂原子与核中钌及钯的相互作用, 大大提高了催化剂对甲醇氧化中间体的去除能力. X射线衍射(XRD)和透射电子显微镜(TEM)的结果揭示了催化剂的核壳结构. 另外, 从TEM还可以看出: 活性组分均匀地分布在碳纳米管载体上, 活性组分粒径约为4.0 nm. 由于这种催化剂能够有效提高铂的利用效率, 并且有效消除甲醇氧化中间体, 在低温燃料电池领域具有良好的应用前景.

关键词: 燃料电池, 甲醇氧化, 核壳结构, 催化剂

Abstract: We prepared a low Pt loading core-shell structured catalyst PdRu@Pt/CNT (carbon nanotube) with a PdRu alloy as the core and platinum as the shell in addition to carbon nanotubes as supports in a two-stage precipitation-reduction approach. For the anodic oxidation of methanol the activity in terms of Pt loading increased by 70% compared with the lab-made Pt/CNT catalyst and the ratio of the forward current density (If) to the backward current density (Ib) was as high as 2, which is two times of that of Pt/ CNT, indicating that the dispersion and use of platinum effectively improves by covering the surface of the PdRu cores with platinum. Excellent tolerance towards the intermediates of the anodic oxidation of methanol may result from the interaction between the Pt shell and the PdRu core. The core-shell structure of the catalysts was revealed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The TEM image showed that the active components are highly dispersed on the CNT with a particle size of 4.0 nm. The high platinum utilization and high performance as well as good tolerance toward poisons make the PdRu@Pt/CNT catalyst a promising low-Pt catalyst for low temperature fuel cell applications.

Key words: Fuel cell, Methanol oxidation, Core-shell structure, Catalyst

MSC2000: 

  • O646