# Enhanced activity and stability of Pt catalysts on functionalized graphene sheets for electrocatalytic oxygen reduction

### Citation:

Kou, R. ; Shao, Y. Y. ; Wang, D. H. ; Engelhard, M. H. ; Kwak, J. H. ; Wang, J. ; Viswanathan, V. V. ; Wang, C. M. ; Lin, Y. H. ; Wang, Y. ; et al. Enhanced activity and stability of Pt catalysts on functionalized graphene sheets for electrocatalytic oxygen reduction. Electrochemistry Communications 2009, 11, 954-957.

May

Article

1388-2481

### Accession Number:

WOS:000266538200006

### Abstract:

Electrocatalysis of oxygen reduction using Pt nanoparticles supported on functionalized graphene sheets (FGSs) was studied. FGSs were prepared by thermal expansion of graphite oxide. Pt nanoparticles with average diameter of 2 nm were uniformly loaded on FGSs by impregnation methods. Pt-FGS showed a higher electrochemical surface area and oxygen reduction activity with improved stability as compared with the commercial catalyst. Transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical characterization suggest that the improved performance of Pt-FGS can be attributed to smaller particle size and less aggregation of Pt nanoparticles on the functionalized graphene sheets.