Synthesis and characterization of nanostructured PtCo-CeO sub(x/C for oxygen reduction reaction)

Highly dispersed PtCo-CeO sub(x couples of fine Pt) sub(3)Co alloy particles with adjacent CeO sub(x are synthesized on a carbon support using the modified colloid method. The average sizes of Pt) sub(3)Co and CeO sub(x particles are approximately 1.7 and 4 nm, respectively. According to XPS studies...

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Published inJournal of power sources Vol. 185; no. 2; pp. 871 - 875
Main Authors Lee, Kang Hee, Kwon, Kyungjung, Roev, Victor, Yoo, Duck Young, Chang, Hyuk, Seung, Doyoung
Format Journal Article
LanguageEnglish
Published 01.12.2008
Subjects
Carbon
Electrocatalysts
Electrodes
Nanostructure
Platinum
Reduction
Surface chemistry
X-ray photoelectron spectroscopy
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Summary:Highly dispersed PtCo-CeO sub(x couples of fine Pt) sub(3)Co alloy particles with adjacent CeO sub(x are synthesized on a carbon support using the modified colloid method. The average sizes of Pt) sub(3)Co and CeO sub(x particles are approximately 1.7 and 4 nm, respectively. According to XPS studies, the CeO) sub(x) particle consists of a CeO sub(2 phase crystal for the core and a Ce) sub(2)O sub(3 phase for the shell. The CeO) sub(x)-containing electrocatalysts of PtCo-CeO sub(x and Pt-CeO) sub(x) show improved electrochemical performances for the oxygen reduction reaction compared with PtCo and Pt electrocatalysts without CeO sub(x in both ring-disc electrode and cell tests. It seems that the unsaturated Ce) sub(2)O sub(3 phase of the CeO) sub(x) surface causes the facile adsorption and desorption of oxygen, leading to an enhanced oxygen supply to the PtCo alloy.
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ISSN:0378-7753
DOI:10.1016/j.jpowsour.2008.09.029