Catalytic activity of carbon supported Pt nano(electrocatalysts. Why reducing the size of Pt nanoparticles is not always beneficial

I.N. Leontyev (1, 2) , S.V. Belenov (1) , V.E. Guterman (1) , P. Haghi-Ashtiani (3) , A.P. Shaganov (4) , B. Dkhil (2)

1 SFEDU - Southern Federal University [Rostov-on-Don]
2 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides
3 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
4 Radiophysical Science and Engineering Fa

Carbon-supported Pt catalysts prepared by the impregnation method in water - dimethyl sulfoxide (DMSO) solutions were investigated. Using X-ray diffraction (XRD) technique for estimation of the particle size and shapes, we show that morphology of the Pt/C catalysts depends strongly on the DMSO content in the solutions. The average particles size reduces and a shape of the Pt nanocrystals changes from a truncated octahedron to a cuboctahedron, and eventually to a truncated cube with increasing DMSO concentration in the reaction mixture. Antibate effects of the size and shape cause non-monotonic dependence of the catalytic activity for the oxygen reduction reaction (ORR) with electric current maximum at an average particle size of 2.7nm.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

I.N. Leontyev, S.V. Belenov, V.E. Guterman, P. Haghi-Ashtiani, A.P. Shaganov, et al.. Catalytic activity of carbon supported Pt nano(electrocatalysts. Why reducing the size of Pt nanoparticles is not always beneficial. Journal of Physical Chemistry C, 2011, 115 (13), pp.5429-5434. ⟨10.1021/jp1109477⟩. ⟨hal-00601363⟩