Selective growth and dissolution of Ni on a PdAu bimetallic surface by in situ STM: determining the relative adsorbate-substrate interaction energy.
By studying the electrochemical growth and dissolution of a Ni monolayer on a PdAu bimetallic surface with in situ STM, we demonstrate that Ni grows preferentially on Au(111) in a wide potential range. In contrast, a Ni monolayer covering the entire bimetallic surface can be selectively dissolved from Pd islands. We show that the Ni-substrate interactions play a key role in this selectivity, and we estimate the binding energy of Ni to Pd to be 80 meV smaller than that of Ni to Au.
Damian
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Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
Maroun
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Allongue
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