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Square Wave Electroanalysis at Generator–Collector Gold–Gold Double Hemisphere Junctions
Author(s) -
Lewis Grace E. M.,
Dale Sara E. C.,
KasprzykHordern Barbara,
Barnes Edward O.,
Compton Richard G.,
Marken Frank
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200242
Subject(s) - electrode , square wave , generator (circuit theory) , diffusion , materials science , square (algebra) , cyclic voltammetry , electrochemistry , analytical chemistry (journal) , chemistry , electrical engineering , physics , mathematics , thermodynamics , power (physics) , voltage , geometry , chromatography , engineering
Gold–gold double‐hemisphere junction electrodes with an inter‐electrode gap of typically 1 µm are employed for generator–collector square wave voltammetry. Electrochemical data are recorded as a function of both generator and collector potential to give three‐dimensional response “maps”. At sufficiently low frequencies, close‐to‐steady‐state conditions for the collector response are achieved and peak responses complementary to those for the generator electrode are recorded. Due to localised interelectrode gap diffusion (fast) as opposed to peripheral diffusion (slow), information about reaction products and intermediates can be obtained. Local pH gradient effects provide additional “fingerprint” information beneficial for future application in analytical detection.