Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (12): 3199-3202.doi: 10.3866/PKU.WHXB20101206

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Effect of NH4+ on the Electrocatalytic Performance of Carbon Supported Pd Catalyst for Formic Acid Oxidation

LI Huan-Zhi, TANG Ya-Wen, LU Tian-Hong   

  1. College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210097, P. R. China
  • Received:2010-08-16 Revised:2010-10-10 Published:2010-12-01
  • Contact: LU Tian-Hong E-mail:tianhonglu@263.net
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873065, 21073094).

Abstract:

We investigated the effect of HClO4, NH4ClO4, and NaClO4 electrolytes on the electrocatalytic performance of a Pd/C catalyst electrode for formic acid oxidation. The Pd/C catalyst was characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The performance of the Pd/C catalyst electrode during formic acid oxidation in different electrolytes was measured using electrochemical methods. We found that the electrocatalytic activity and stability of the Pd/C catalyst electrode for formic acid oxidation decreased in the following order: NH4ClO4 > NaClO4 > HClO4. The difference in pH between the different electrolytes was small because of the presence of formic acid. Therefore, the electrolyte pH has a small effect and the cations have a large effect. The better performance of the NaClO4 electrolyte compared to the HClO4 electrolyte is due to a pH effect. The better performance of the NH4ClO4 electrolyte compared to the NaClO4 electrolyte is due to NH4+ decreasing the adsorption strength and amount of CO on the Pd/C catalyst. This finding has large significance for the increase in the performance of the direct formic acid fuel cell (DFAFC).

Key words: Formic acid, Electrolyte, Palladium, Direct formic acid fuel cell

MSC2000: 

  • O643