Auto-inhibition of hydrogen gas evolution on gold in aqueous acid solution |
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Authors: | Declan L Burke Anthony P O'Mullane Vincent E Lodge Marcus B Mooney |
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Institution: | (1) Chemistry Department, National University of Ireland, Cork, Ireland,;(2) National Microelectronics Research Centre, Prospect Row, National University of Ireland, Cork, Ireland, |
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Abstract: | It was demonstrated recently that dramatic changes in the redox behaviour of gold/aqueous solution interfaces may be observed
following either cathodic or thermal electrode pretreatment. Further work on the cathodic pretreatment of gold in acid solution
revealed that as the activity of the gold surface was increased, its performance as a substrate for hydrogen gas evolution
under constant potential conditions deteriorated. The change in activity of the gold atoms at the interface, which was attributed
to a hydrogen embrittlement process (the occurrence of the latter was subsequently checked by surface microscopy), was confirmed,
as in earlier work, by the appearance of a substantial anodic peak at ca. 0.5 V (RHE) in a post-activation positive sweep.
Changes in the catalytic activity of a metal surface reflect the fact that the structure (or topography), thermodynamic activity
and electronic properties of a surface are dependent not only on pretreatment but also, in the case of the hydrogen evolution
reaction, vary with time during the course of reaction. As will be reported shortly, similar (and often more dramatic) time-dependent
behaviour was observed for hydrogen gas evolution on other metal electrodes.
Electronic Publication |
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Keywords: | Gold Active states Hydrogen evolution Inhibition Cathodization |
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