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Coupled Electrokinetic Transport and Electron Transfer at Annular Nanoband Electrodes Embedded in Cylindrical Nanopores
Author(s) -
Zaino Lawrence P.,
Contento Nicholas M.,
Branagan Sean P.,
Bohn Paul W.
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402111
Subject(s) - electrode , electrokinetic phenomena , nanopore , materials science , analytical chemistry (journal) , drop (telecommunication) , chemical physics , electron transfer , chemistry , optoelectronics , nanotechnology , chromatography , electrical engineering , organic chemistry , engineering
Convective mass transport is achieved in nanopore arrays containing embedded annular nanoband electrodes (EANEs) by using both two‐ and three‐electrode systems. In the two‐electrode configuration, the potential drop between the EANE and a counter/quasi‐reference electrode (CE/QRE) controls the electro‐osmotic flow (EOF). EOF enhances the rate of electron‐transfer reactions at an EANE array. Three‐electrode configurations, in which the EANE is placed between the CE/QRE and a second working electrode (WE 2 ), are also studied. In the three‐electrode configuration, the position and magnitude of the current peaks are dependent on the WE 2 potential. These shifts, which are characteristic of strong coupling between the EOF caused by WE 2 and the faradaic processes monitored at the EANE, are explained by a combination of EOF and the concentration of analyte in the nanochannel. EOF is dictated collectively by the EANE and the WE 2 , because the potential at both electrodes is modified by substantial iR drops in the high‐resistance nanopores.