The Functionalizing Effect of Increasingly Graphitic Carbon Supports on Carbon-Supported and TiO2-Carbon Composite-Supported Pt Nanoparticles.

J. Ma (1) , A. Habrioux (1) , A. Guignard (1) , N. Alonso-Vante (1)

1 IC2MP [Poitiers] - Institut de chimie des milieux et matériaux de Poitiers [UMR 7285]

Strong interaction between Pt nanoparticles and graphitic carbon in carbon-based and oxide–carbon composite substrates is demonstrated using electrochemical CO stripping experiments. A correlation between the in-plane crystallite size of the carbon supports and the oxidation charge of CO stripping wave was made. It appears that π-system of graphitized carbon anchors platinum particles in a way that strongly modifies the electronic properties of the Pt valence band. The effects of graphitized carbon on platinum are even observable on TiO2–carbon composite-supported Pt, where a well-known strong metal–support interaction between Pt and TiO2 is already present, demonstrating the significant extent of the interaction between Pt and graphite. Finally, a preliminary proof of the role played by the interfacial Pt–Ti nanoalloy on oxide–carbon composite is given.

Domaines: Catalyse; Chimie organique; Autre

J. Ma, A. Habrioux, A. Guignard, N. Alonso-Vante. The Functionalizing Effect of Increasingly Graphitic Carbon Supports on Carbon-Supported and TiO2-Carbon Composite-Supported Pt Nanoparticles.. The Journal of physical chemistry, 2012, 116, pp.21788-21794. ⟨10.1021/jp304947y⟩. ⟨hal-00904904⟩