Surface structures and electronic properties of hypophosphite
H2PO-2
molecularly adsorbed on Ni(111) and Ag(111) surfaces were investigated using B3LYP density functional theory.The most stable structure is that H2PO-2 is adsorbed with its two P—O bonds in faced to the substrate surface and with O atoms in bridge sites.The results of the Mulliken population analysis show that because of subtle difference of electron configuration
the adsorption energy is larger on the Ni surface than on the Ag surface
and that the role of both electron donation and back donation is larger on the Ni surface than on the Ag surface.There are more negative Mulliken charges transfers from H2PO-2 to substrate clusters on Ni substrate clusters than on Ag substrate clusters and more positive Mulliken charges on P atom in Ni4H2PO-2 than in Ag4H2PO-2
which means that P atom in Ni4H2PO-2 is easily attacked by nucleophile such as OH-
and farther H2PO-2 is more easily oxidated on Ni substrate than on Ag substrate.These results indicate that the silver surface is inactive
and the nickel surface is active for the oxidation reaction of hypophosphite ion.
关键词
密度泛函理论次磷酸盐镍银吸附
Keywords
density functional theoryhypophosphiteNickelsilveradsorption