To a Theory of Electrocatalysis for the Hydrogen Evolution Reaction: The Hydrogen Chemisorption Energy on the Transition Metal Alloys within the Anderson–Newns Model |
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Authors: | Medvedev I G |
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Institution: | (1) Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia |
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Abstract: | Estimates of the energy of chemisorption of hydrogen (ECH) on a number of alloys of transition metals that are of interest from the viewpoint of a theory of electrocatalysis are made within the Anderson–Newns model. As a simplest example, the behavior of ECH as a function of the position of the Fermi level of a system for nickel containing admixtures of simple metals is studied in a fixed-band approximation. As alternative examples, where this approximation is not fulfilled, a calculation of ECH on tungsten carbide and a Pd1 – x
Ag
x
alloy is performed. It is shown that agreement between calculated ECH and observed ECH is reached in the case of an Ni1 – x
Cu
x
alloy after taking into account mutual influence of processes of adsorption and segregation on the alloy surface. Dependence of rates of a number of electrochemical reactions on the composition and electronic structure of alloys is discussed for all the alloys considered and a comparison with experiment is performed. |
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Keywords: | electrocatalysis hydrogen evolution reaction chemisorption energy Anderson– Newns model electronic structure |
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