催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (3): 281-284.

• 研究论文 • 上一篇    下一篇

Pt/碳纳米管电极的电化学稳定性

邵玉艳,尹鸽平,王家钧,高云智   

  1. 哈尔滨工业大学应用化学系, 黑龙江哈尔滨 150001
  • 收稿日期:2006-03-25 出版日期:2006-03-25 发布日期:1984-10-26

Electrochemical Durability of Pt/Carbon Nanotube Electrode

SHAO Yuyan, YIN Geping*, WANG Jiajun, GAO Yunzhi   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
  • Received:2006-03-25 Online:2006-03-25 Published:1984-10-26

PDF

1029

被引次数

40

摘要： 研究了Pt/CNT(碳纳米管)电极在动电位和恒电位两种情况下的电化学稳定性. 在动电位条件(0.05～1.2 V vs RHE(可逆氢电极)循环伏安940次, 60 h)下, Pt/CNT电极的电化学表面积下降18.8%; 在恒电位条件(1.2 V vs RHE, 60 h)下, Pt/CNT电极的电化学表面积仅下降5.2%. 这表明Pt/CNT电极在动电位条件下性能衰减得更迅速. X射线光电子能谱分析表明,恒电位条件下载体碳纳米管被氧化的程度较大. X射线衍射分析计算表明,动电位和恒电位氧化后, Pt颗粒的平均粒径从3.8 nm分别增大到4.9和3.9 nm. Pt颗粒的长大可能是Pt/CNT电极性能衰减的主要原因之一,而载体的氧化不是Pt/CNT电极性能衰减的主要原因.

关键词: 铂, 碳纳米管, 燃料电池, 电化学表面积, 稳定性

Abstract: The electrochemical durability of Pt/carbon nanotube (CNT) electrode under potentiodynamic and potentiostatic conditions was investigated. The electrochemical surface area decreased by 18.8% after the electrode was cycled at 0.05～1.2 V for 940 cycles (60 h), while only 5.2% after potentiostatic oxidation at 1.2 V for 60 h. The performance of the Pt/CNT electrode therefore degraded more rapidly under the potentiodynamic condition than that under the potentiostatic condition. X-ray photoelectron spectroscopy analysis showed that the increase in the amount of surface oxygen on the support (multiwalled carbon nanotube) of 1.2 V-oxidized Pt/CNT was more than that on the cyclic voltammetry (CV)-treated one, which indicated that the oxidation degree of MWNT under the potentiostatic condition was higher. X-ray diffraction analysis showed that Pt particle size increased from 3.8 nm to 3.9 and 4.9 nm for 1.2 V-oxidized and CV-oxidized Pt/CNT, respectively. These imply that the increase in Pt particle size, instead of the oxidation of the support, is one of the main reasons for the degradation of Pt/CNT performance.

Key words: platinum, carbon nanotube, fuel cell, electrochemical surface area, durability