STUDIES ON THE SELECTIVE CATALYSIS OF THE ELECTRODE-REACTIONS IN THE H2/BR2 STORAGE-SYSTEM

Considerable rates are obtained for the hydrogen electrode reactions using WC-gas-diffusion electrodes which are not impaired by active Br2 in the solution. Tafel-lines with b-values of appr. 30 mV for both, anodic and cathodic current density potential curves, can be attributed to the Tafel-reaction as the rate controlling step. High reversibility (very low polarization) of the Br2/2 Br- redox couple is observed at activated carbon plastic composite material. The presence of H-2 does not influence the electrode behavior. The use of both substrates in the H-2/Br2 storage system provides definite advantages of the conceptual design and operation due to their electrocatalytic selectivity.