Study of the hydrogen reaction on bismuth modified platinum electrodes based on the equilibrium polarisation resistance

QUAINO, PAOLA MONICA; GENNERO DE CHIALVO, MARIA ROSA; CHIALVO, ABEL CESAR

Anales de la Asociación Química Argentina

Asociacion Quimica Argentina

Lugar: Buenos Aires, Argentina; Año: 2003 vol. 91 p. 43 - 54

0365-0375

The hydrogen electrode reaction (HER) was studied on platinum electrodes with different surface coverage of adsorbed bismuth. It was demostrated that, independently of the degree of inhibition of the sites occupied by the adsorbed hydrogen H(ad) (UPD) on the part of the Bi(ad) atoms, the reversible hydrogen potential is established and the equilibrium polarisation resistance is invariant. The experimental results were interpreted on terms of a kinetic model based on the dependences of the standard Gibbs free energy of H(ad) on OPD sites.