Journal
ELECTROCHIMICA ACTA
Volume 122, Issue -, Pages 316-321Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.10.134
Keywords
Solid-contact ion-selective electrode; Conducting polymer; Standard potential; Chronoamperometry; Chronopotentiometry
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Funding
- Graduate School of Chemical Sensors and Microanalytical Systems (CHEMSEM)
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This work addresses the well-known problem of variations in the standard potential (E degrees) of solid-contact ion-selective electrodes (SC-ISEs) that have a conducting polymer (CP) as ion-to-electron transducer covered by a polymeric ion-selective membrane. Poly(3,4-ethylene dioxythiophene) doped with poly(sodium 4-styrenesulfonate), i.e. PEDOT(PSS), was electrodeposited on glassy carbon (GC) disk electrodes and used as the solid contact for three different types of PVC-based membranes in order to elucidate the possibility to electrochemically control E degrees for this type of SC-ISE. The GC/PEDOT(PSS) electrode was thus coated with potassium-selective membranes with and without the lipophilic salt tetradocedylammonium tetrakis(4-clorophenyl)borate (ETH-500) and by a cation-sensitive membrane without ionophore. The results show that the standard potential of the studied types of SC-ISEs can be shifted by applying a potential that deviates from the open-circuit potential of the electrode in the chosen electrolyte solution or by applying current pulses in the nA range. (C) 2013 Elsevier Ltd. All rights reserved.
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