Auto-inhibition of hydrogen gas evolution on gold in aqueous acid solution
Burke, Declan L., O'Mullane, Anthony P., Lodge, Vincent E., & Mooney, Marcus B. (2001) Auto-inhibition of hydrogen gas evolution on gold in aqueous acid solution. Journal of Solid State Electrochemistry, 5(5), pp. 319-327.
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.
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|Item Type:||Journal Article|
|Additional Information:||Prior to commencement at QUT|
|Keywords:||Gold, Active states, Hydrogen evolution, Inhibition, Cathodization|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Deposited On:||22 Nov 2013 01:41|
|Last Modified:||22 Nov 2013 01:41|
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