Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrocatalysis of Oxygen Reduction by Au Nanoparticles Electrodeposited on Polyoxometalate-Modified Electrode Surfaces

  • Choi, Kyung-Min (Department of Chemistry, Chung Buk National University) ;
  • Choi, Su-Hee (Department of Chemistry, Chung Buk National University) ;
  • Kim, Jong-Won (Department of Chemistry, Chung Buk National University)
  • Published : 2009.02.28
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Abstract

The effect of polyoxometalate monolayers on the electrodeposition of Au nanoparticles (AuNPs) on glassy carbon (GC) surfaces was examined by electrochemical and scanning electron microscope techniques. The presence of $SiMo_{12}O^{4-}_{40}$-layers resulted in average particle sizes of ca. 60 nm, which is larger than AuNPs deposited on bare GC surfaces. AuNPs electrodeposited on $SiMo_{12}O^{4-}_{40}$-modified GC surfaces for 20 s exhibited the best electrocatalytic activity for oxygen reduction. This system exhibited similar or slightly better efficiency for oxygen reduction than a bare Au electrode. Rotating disk electrode experiments were also performed and revealed that the catalytic reduction of oxygen on AuNPs deposited on $SiMo_{12}O^{4-}_{40}$-modified GC electrodes is a two-electron process.

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References

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