Corrosion Resistance and Stability of the Pt-Ni and Pt-Co Nanoparticles Prepared by the Double Potential Step Electrolysis

Corrosion Resistance and Stability of the Pt-Ni and Pt-Co Nanoparticles Prepared by the Double Potential Step Electrolysis

Takashi Nishimura* Tsutomu Morikawa Masayuki Yokoi Hiroshi Inoue 

Technology Research Institute of Osaka Prefecture, 2-7-1 Ayumino, Izumi, Osaka 594-1157, Japan

Department of Applied Chemistry, Graduated School of Engineering, Osaka Prefecture University, 1-1gakuencho, Sakai, Osaka 599-8531, Japan

Corresponding Author Email:
September 08, 2010
November 10, 2010
December 20, 2010
| Citation

The Pt-Ni and Pt-Co nanoparticles covered with a Pt skin layer were prepared by the double potential step electrolysis (DPSE), which composed of potential steps for electrodeposition of the Pt-Ni and Pt-Co alloy and the following selective dissolution of the Ni and Co component, respectively. With this method, the Pt alloy nanoparticles covered with a Pt skin layer could be prepared just in one process, and the composition and size of the Pt alloy nanoparticles could be easily controlled by changing the electrode potential and plating bath composition. Both the nanoparticles by the DPSE exhibited higher corrosion resistance and oxygen reduction reaction (ORR) activity than the Pt nanoparticles even after deterioration test, and the surface contents of them were kept constant around 4 % Co and 8 % Ni measured by XPS over the wide range of Pt alloy compositions, respectively. Comparing the Pt-Ni with Pt-Co nanoparticles, the Pt-Co nanoparticles were found to be more stable than the Pt-Ni nanoparticles, and suggested that a Pt-skin layer on Pt alloy particles had an important role in their performances.


 potential step electrolysis, Pt alloy, nanoparticles, corrosion resistance, stability 

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusion

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