物理化学学报 >> 2006, Vol. 22 >> Issue (02): 141-145.doi: 10.3866/PKU.WHXB20060203

研究论文 上一篇    下一篇

NdOx作为助催化剂对PtRu/C电催化氧化甲醇活性的影响

陈玲; 王新东; 郭敏   

  1. 北京科技大学冶金与生态工程学院, 北京 100083
  • 收稿日期:2005-06-18 修回日期:2005-09-27 发布日期:2006-01-22
  • 通讯作者: 王新东 E-mail:echem@ustb.edu.cn

The Effect of NdOx as Co-catalyst for the Electro-oxidation of Methanol on PtRu/C

CHEN Ling; WANG Xin-dong; GUO Min   

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
  • Received:2005-06-18 Revised:2005-09-27 Published:2006-01-22
  • Contact: WANG Xin-dong E-mail:echem@ustb.edu.cn

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摘要： 采用沉积-还原法制备了PtRu-NdOx/C催化剂, 借助TEM、EDS和XRD等测试手段对其进行了微结构和组成的表征. 结果表明, 催化剂中Pt与Ru以合金形式存在, 而Nd的氧化物则以无定形形态存在. 催化剂粒子的平均粒径在2 nm左右, 晶胞参数为0.3896 nm, Nd氧化物的加入对PtRu合金的晶体结构影响不明显. 采用循环伏安法和计时电流法, 比较了PtRu-NdOx/C催化剂和PtRu /C催化剂对甲醇氧化的电催化活性, 结果表明, 加入Nd的氧化物作为助催化剂能明显提高PtRu /C催化剂对甲醇氧化的电催化性能.

关键词: 直接甲醇燃料电池, PtRu-NdOx/C催化剂, 沉积-还原法, 电化学催化

Abstract: The PtRu-NdOx /C catalysts have been prepared by deposition-reduction method. EDX、XRD, and TEM measurements have been used to characterize the composition, particle size, and crystallinity of the catalysts. The catalyst materials consist of Pt-Ru alloy particles and varying amounts of Nd oxide. The average particle size and the lattice parameter of the catalysts are about 2 nm and 0.3896 nm, respectively, which indicates that Nd oxide in PtRu-NdOx /C has no effects on the crystal structure of the Pt-Ru alloy particles. The electrocatalytic activities of the PtRu-NdOx /C catalysts and PtRu/C catalysts have been investigated by cyclic voltammetry and chronoamperometric measurements. Nd oxide can improve the degree of dispersion of the noble metals in the catalysts and as co-catalyst lead to an improvement of the catalytic activity towards methanol oxidation.

Key words: Direct methanol fuel cell, PtRu-NdOx /C catalyst, Deposition-reduction method, Electrochemical catalysis