The adsorption of isolated H(2)O on Pd {100} has been investigated by density functional theory calculations. We have presented a detailed picture for the adsorption of water monomer on various high-symmetry sites of the surface. We have demonstrated that other d orbitals are responsible for the water adsorptions, in addition to the well-recognized role of d(z)(2) orbital. Furthermore, Pd 5 s state was found to play an essential role in water adsorptions including the favored on-top case. Our findings augment existing knowledge of the electronic nature of water-metal interactions.
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