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- Title
Redox reactivity at silver microparticle-glassy carbon contacts under a coating of polymer of intrinsic microporosity (PIM).
- Authors
He, Daping; Rauwel, Erwan; Malpass-Evans, Richard; Carta, Mariolino; McKeown, Neil; Gorle, Demudu; Anbu Kulandainathan, M.; Marken, Frank
- Abstract
Silver microparticles (ca. 1 μm average size clustered into cage-like aggregates of 10-20 μm diameter) are shown to adhere to a glassy carbon electrode surface to give voltammetric current responses, which are considerably enhanced/stabilised when applying a coating with a molecularly rigid polymer of intrinsic microporosity (PIM-EA-TB). In preliminary voltammetric experiments characteristic Ag(0/I) surface oxidation and back-reduction processes are observed in aqueous phosphate buffer (associated with silver phosphate layer formation on the silver surface). In contrast to the oxidation, which is dominated by a nucleation process causing a sharp well-defined current signal, for the back-reduction stochastic current responses are observed possibly associated with density fluctuations in the surrounding liquid phase ('Brownian activation') as an essential part of the mechanism of conversion of surface-oxidised silver back to silver metal.
- Subjects
SILVER nanoparticles; OXIDATION-reduction reaction; REACTIVITY (Chemistry); CARBON electrodes; OXIDATION
- Publication
Journal of Solid State Electrochemistry, 2017, Vol 21, Issue 7, p2141
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-017-3534-2