Journal
ELECTROANALYSIS
Volume 27, Issue 3, Pages 602-608Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201400274
Keywords
Ionic liquid; Redox buffer; Reference electrode; Solid contact
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Funding
- National Science Foundation [SBIR 1256626 II-P]
- OISE [CHE-0809328]
- Graduate School, University of Minnesota
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Solid-contact reference electrodes that comprise a polymeric reference membrane doped with an ionic liquid are an alternative to conventional reference electrodes with a salt bridge. To enhance the electrode-to-electrode reproducibility of solid-contact reference electrodes, a hydrophobic redox buffer consisting of the Co(III) and Co(II) complexes of 1,10-phenanthroline ([Co(phen)(3)](3+/2+)) was incorporated into these reference membranes, providing redox buffer capacity at the interface of the reference membrane and the underlying solid electron conductor. As required for proper functioning, the E degrees of these reference electrodes is not sample dependent and exhibits a good electrode-to-electrode reproducibility, with a standard deviation as low as 2.1mV.
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