Adsorption and Activation of Water on Cuboctahedral Rhodium and Platinum Nanoparticles
Bazhenov, Andrey; Lefferts, Leon; Honkala, Karoliina (2017). Adsorption and Activation of Water on Cuboctahedral Rhodium and Platinum Nanoparticles. Journal of Physical Chemistry C, 121 (8), 4324-4331. DOI: 10.1021/acs.jpcc.6b11953
Published inJournal of Physical Chemistry C
© 2017 American Chemical Society. This is a final draft version of an article whose final and definitive form has been published by American Chemical Society. Published in this repository with the kind permission of the publisher.
Rh and Pt are widely used as the components in heterogeneous catalysts for multiple industrial applications. Because the metals are typically in the form of nanoparticles in real catalysts, it is important to carefully select models for the computational prediction of the catalytic properties. Here we report a first-principles study on the water activation, an important step in numerous catalytic reactions, using the finite-size Rh and Pt nanoparticle models and compare them to the extended surface models. We show that regardless of the model, adsorption and activation of water is practically identical for both metals, whereas the dissociation is energetically more favorable on Rh. The experimentally observed difference thus must be attributed to stronger interaction of dissociated water with the metal surfaces or to the presence of the oxide support. Through a selection of descriptors, we demonstrate that the extended surface models cannot fully represent the atomic and electronic structures of the small nanoparticles of <2 nm in size. ...