Abstract
Studies on the electrolytic decomposition of concentrated HBr, i.c. the electrochemical reaction step of the Mark-13 cycle, were performed in the presence of well defined amounts of platinum-metal and other metal catalysts. The cathodic deposition of Pt, Pd, Ru, Ir, Rh, Os, Re and Au on graphite reduced the hydrogen overvoltage to a remarkable extent; the lowest values being found for Pt and Pd. The Pt layer deposited at 353 and 373 K proved to be stable against corrosion in concentrated HBr at these temperatures and showed a lower hydrogen overvoltage than smooth platinum. Electrolysis was carried out in an undivided cell with structured platinized graphite electrodes. The deposition of the metals onto the cathode was examined by scanning electron microscopy.
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