Rotating ring–disc electrode study of the enhanced oxygen evolution on an activated ruthenium electrode

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  • MVMarijan Vuković
    Marijan Vuković
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Abstract
The relationship between stability and electrocatalytic efficiency for the oxygen evolution reaction and ruthenium dissolution in 0.5 mol dm–3 H2SO4 was determined using a rotating ring–disc electrode. Two different types of ruthenium electrode were used: one with ruthenium freshly electrodeposited on platinum and the other electrochemically activated by square-wave pulses from –0.2 V to +0.85 V vs. SCE. Both exhibited different electrocatalytic properties and current efficiencies for ruthenium dissolution. It was shown that the enhanced electrocatalytic efficiency of the activated electrode was 86% electrocatalytic. Both types of electrode were stable during potentiodynamic oxide formation and oxide reduction; the significant dissolution of ruthenium took place only at high positive potentials accompanied by oxygen evolution.

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