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Citation: KE Xi, CUI Guo-Feng, SHEN Pei-Kang. Stability of Pd-Fe Alloy Catalysts[J]. Acta Physico-Chimica Sinica, ;2009, 25(02): 213-217. doi: 10.3866/PKU.WHXB20090203 shu

Stability of Pd-Fe Alloy Catalysts

1.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China; School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China

Received Date: 28 August 2008
Available Online: 4 December 2008

The stability of Pd-Fe alloy catalysts for the oxygen reduction reaction (ORR) was characterized in situ by using the rotating disk electrode and electrochemical quartz crystal microbalance (EQCM) techniques, both in acidic and alkaline solutions. The alloy catalyst was found to be unstable in the acidic solution because of the electrochemical and chemical dissolution of the catalyst. This dissolution resulted in a reduction of activity for the oxygen reduction reaction and also a reduction in the mass of the catalyst. In an alkaline solution, the mass of the Pd-Fe alloy catalyst deposited on the electrode surface and its electrochemically active surface area hardly changed. Consequently, the catalyst kept its activity for stable oxygen reduction.
- Pd-Fe alloy; Electrochemical quartz crystal microbalance; Catalyst; Fuel cell; Stability
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