TY - JOUR
T1 - Ultrafast chronoamperometry of acoustically agitated solid particulate suspensions
T2 - Nonfaradaic and faradaic processes at a polycrystalline gold electrode
AU - Rees, N.V.
AU - Banks, C.E.
AU - Compton, R.G.
N1 - Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/12/2
Y1 - 2004/12/2
N2 - "Nanosecond" electrochemistry is used to investigate the impacts of various solid particles (alumina and graphite suspended in aqueous perchloric acid and copper suspended in aqueous sodium perchlorate) at a polycrystalline gold electrode under insonation. Current spikes of microsecond duration, attributed to individual impacts, are observed under potentiostatic conditions, with a polarity that inverts at the potential of zero charge of the electrode/electrolyte system. It is found that there is no significant change in the magnitude of these transients as the sizes of alumina particles range from 0.3 to 25 μm. However, appreciable changes are observed in the transients when using electroactive particles, specifically graphite powder surface modified with adsorbed N,Ń-diphenyl-1,4-phenylenediamine, and evidence is presented for the occurrence of electron transfer during the impact event which occurs on the sub-microsecond time scale.
AB - "Nanosecond" electrochemistry is used to investigate the impacts of various solid particles (alumina and graphite suspended in aqueous perchloric acid and copper suspended in aqueous sodium perchlorate) at a polycrystalline gold electrode under insonation. Current spikes of microsecond duration, attributed to individual impacts, are observed under potentiostatic conditions, with a polarity that inverts at the potential of zero charge of the electrode/electrolyte system. It is found that there is no significant change in the magnitude of these transients as the sizes of alumina particles range from 0.3 to 25 μm. However, appreciable changes are observed in the transients when using electroactive particles, specifically graphite powder surface modified with adsorbed N,Ń-diphenyl-1,4-phenylenediamine, and evidence is presented for the occurrence of electron transfer during the impact event which occurs on the sub-microsecond time scale.
UR - http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-10644259666&md5=34c252752024a91f3802a0a74a98333c
U2 - 10.1021/jp040602v
DO - 10.1021/jp040602v
M3 - Article
AN - SCOPUS:10644259666
SN - 1520-6106
VL - 108
SP - 18391
EP - 18394
JO - The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
JF - The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
IS - 48
ER -