Abstract
Ruthenium dioxide was investigated as a cathode material for hydrogen evolution in acid media. In 1 N H2SO4 a Tafel slope of 40m V was obtained and an exchange current density of 6×10−5 A cm−2, which is about one order of magnitude lower than that for platinum. XPS analysis showed that only partial reduction of the oxide occurred during hydrogen evolution. RuO2 cathodes are almost insensitive to poisoning by metal ions in solution. This observation is in contrast to the behaviour of platinum and can be correlated to the underpotential deposition phenomenon which does not occur on RuO2. The performance of RuO2 cathodes in lab-scale Membrel water electrolysis cells is demonstrated and compared to that of platinum cathodes.
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