Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (04): 871-876.doi: 10.3866/PKU.WHXB201202013

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Highly Active Pd-Co3O4/MWCNTs Catalysts for Methanol Electrocatalytic Oxidation

NIE Su-Lian, ZHAO Yan-Chun, FAN Jie-Wen, TIAN Jian-Niao, NING Zhen, LI Xiao-Xiao   

  1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Education of China, College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, Guangxi Province, P. R. China
  • Received:2011-10-19 Revised:2012-01-10 Published:2012-03-21
  • Contact: ZHAO Yan-Chun
  • Supported by:

    The project was supported by the Guangxi Natural Science Foundation, China (2010GXNSFF013001, 0728043) and National Natural Science Foundation of China (21163002).

Abstract: Nano-flocculent-Co3O4 modified multi-walled carbon nanotubes supported Pd nanoparticles (Pd-Co3O4/MWCNTs) with uniform dimensions were prepared by a facile hydrothermal method using Co(NO3)3·6H2O as the cobalt source, polyethylene glycol (PEG) 20000 as a surface active agent, and H2PdCl4 as the Pd precursor. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray powder diffraction. The Pd nanoparticles had a face-centered cubic crystal structure and were well dispersed on the external walls of the Co3O4/MWCNTs. The catalytic activity was studied by cyclic voltammetry and chronoamperometry toward methanol oxidation. The Pd-Co3O4/MWCNT catalysts had a large electrochemically active area, good electrocatalytic performance, and stability toward methanol oxidation in alkaline media. All the results suggest that Co3O4 will improve the electrocatalytic activity in direct methanol fuel cells.

Key words: Direct methanol fuel cell, Co3O4, Hydrothermal method, Pd, Multi-walled carbon nanotubes, Electrocatalytic oxidation