KINETIC STUDIES OF THE HYDROGEN ELECTRODE WITH THE ROTATING DISK TECHNIQUE.
Technical rept. no. 19,
WESTERN RESERVE UNIV CLEVELAND OHIO ELECTROCHEMISTRY RESEARCH LAB
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The work was undertaken to elucidate some aspects of the anodic oxidation of hydrogen on a rotating platinum disk electrode under conditions which allowed polarization studies at atmospheric and elevated pressures up to 60 atm. Solutions of 1 N HBr, H2SO4, and HC104 were used. All anodic polarization curves showed characteristic current density maxima or flat portions. The position of the maxima with respect to the overpotential coordinate was found to depend on the pre-treatment of the electrode, on the potentiostatic scan rate, and to some extent on the angular velocity of the disk. The data in all experiments with 1 N HBr and in most tests with 1 N H2SO4 showed upon treatment by the rotating disk-reaction order method that the anodic hydrogen reaction on platinum in these media is first order with respect to concentration of hydrogen. A mathematical treatment based on simultaneous control by the dissociative-adsorptive charge transfer H yields H e- steps was developed.