Electrocatalytic oxygen reduction reaction (ORR) on nanoparticles has attracted much attention in recent years for its significance in fuel cell applications.Here by combining density functional theory (DFT) calculations with the periodic continuum solvation model based on modified-Poisson-Boltzmann (CM-MPB) electrostatics, we analyzed the ORR activity on a set of differently-sized Pt nanoparticles in order to identify the optimum particles for better designed catalyst. We show that Pt nanoparticles of ~2nm size the highest ORR mass activity, which is attributed to the variation of the effective reaction sites on the exposed {111} facet at the electrochemical conditions. We propose a type of new nanocatalyst for electrocatalytic oxygen reduction based on the knowledge from large-scale first principles simulations on Pt nanoparticles. The new catalyst has the inert metal Au as the frame for the Pt nanoparticle and the exposed Pt{111} sites are the active site for oxygen reduction. Such an architecture can not only prevent the initial O corrosion at the edge sites but also significantly improve the activity. The theoretical work provides a promising new direction for the rational design of stable and active ORR catalyst via nano-structure engineering.    Fig.1 The calculated ORR mass activity(MA) of Pt nanoparticles(left) and the free energy barrier ?Ga of pure Pt and Au-framed Pt nanoparticles at 0.9V. The surface composition of typical Pt and Au-framed Pt nanoparticles under electrochemical conditions are also shown here.

Structure optimization and new design of nanoparticles for electrocatalytic oxygen reduction

248th National Meeting (2014)

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