Effect of Fe on Electrocatalytic Activity of Pt-Fe/C Catalyst for Oxygen Reduction

Chem. J. Chinese Universities

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Effect of Fe on Electrocatalytic Activity of Pt-Fe/C Catalyst for Oxygen Reduction

WANG Yan-En¹, TANG Ya-Wen¹, ZHOU Yi-Ming¹, GAO Ying², LIU Chang-Peng³, LU Tian-Hong^1,3*

1. College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, China;
2. Department of Chemistry, College of Sciences, Harbin Normal University, Harbin 150080, China;
3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received:2006-05-13 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10
Contact: LU Tian-Hong

Abstract

Abstract: In this paper, the carbon supported Pt-Fe(Pt-Fe/C) cathodic catalyst in the direct methanol fuel cell was prepared. The results of the energy dispersive X-ray(EDX) analysis, X-ray reflection spectroscopy(XRD) and electrochemical measurements indicate that in the Pt-Fe/C catalyst, Fe exists as the three forms. About 20%(mass fraction) Fe enters the crystal lattice of Pt, forming the alloy with Pt. About 80%(mass fraction) Fe does not enter the crystal lattice of Pt and exists as Fe and Fe₂O₃. After the Pt-Fe/C catalyst being treated with acid , non-alloying Fe and Fe₂O₃ in the catalyst are dissolved. Therefore, the electrochemically active specific surface area of the Pt-Fe particles in the Pt-Fe/C catalyst after the acid treatment is 30% larger than that of the Pt-Fe/C catalyst before the acid treatment. Thus, the electrocatalytic activity of the Pt-Fe/C catalyst after the acid treatment for the oxygen reduction is higher than that of the Pt-Fe/C catalyst before the acid treatment. It illustrates that the electrochemically active specific surface area of the Pt-Fe particles in the Pt-Fe/C catalyst can significantly affects the electrocatalytic activity of the Pt-Fe/C catalyst for the oxygen reduction. In addition, it also demonstrates that only alloying Fe can increase the electrocatalytic activity of the Pt for the oxygen reduction and non-alloying Fe has no such effect.

Key words: Carbon supported Pt-Fe catalyst, Oxygen reduction, Electrochemically active specific surface area, Electrocatalytic activity

CLC Number:

O646

TrendMD:

WANG Yan-En¹, TANG Ya-Wen¹, ZHOU Yi-Ming¹, GAO Ying², LIU Chang-Peng³, LU Tian-Hong^1,3*. Effect of Fe on Electrocatalytic Activity of Pt-Fe/C Catalyst for Oxygen Reduction[J]. Chem. J. Chinese Universities, doi: .

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Effect of Fe on Electrocatalytic Activity of Pt-Fe/C Catalyst for Oxygen Reduction

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