Preparation, structure and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts

Wells, P. P.; Crabb, E. M.; King, C. R.; Wiltshire, R.; Bilsborrow, B.; Thompsett, D. and Russell, A. E. (2009). Preparation, structure and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts. Physical Chemistry Chemical Physics, 11(27) pp. 5773–5781.

DOI: https://doi.org/10.1039/b823504j

Abstract

A controlled surface reaction technique has been successfully employed to prepare a series of Pt modified Pd/C (Pt/Pd/C) and Pd modified Pt/C (Pd/Pt/C) catalysts. The resulting catalyst materials were characterised by TEM, XRD, electrochemistry, and EXAFS techniques. In the case of the Pd/Pt/C carbon catalysts, core-shell structural arrangements were found, with a 0.04 angstrom contraction of the Pd-Pd bond distance for the 1 Pd/Pt/C being observed. A greater degree of alloying was found for the Pt/Pd/C catalysts where the surface had a mixed composition with a large proportion of the Pt in the interior of the nanoparticle. However, strong Pt characteristics were exhibited in the voltammetry of Pt/Pd/C catalysts, most notably a large increase in the stability with respect to the electrochemical environment compared to Pd alone.

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