Abstract
The author calculated approximately the value of the bond energy of the ε-phase, an electron compound with close-packed hexagonal lattices, attributing the extremely small value of the hydrogen overvoltage of the ε-phase to the adsorption energy of atomic hydrogen and therefore the bond energy of metals at the lattice constant a=2.7 Å. Then deriving the relation among the first term of Tafel’s equation connected with the electrode metal, the bond energy of metal and the lattice constant a, the author showed the possibility of deciding the general tendency of the variation of the hydrogen overvoltage against changes in the composition of many alloys.
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