Ionic Liquid Reference Electrodes With a Well‐Controlled Co(II)/Co(III) Redox Buffer as Solid Contact | Zendy

Zou Xu U. | Zendy; Chen Li D. | Zendy; Lai ChunZe | Zendy; Bühlmann Philippe | Zendy

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Ionic Liquid Reference Electrodes With a Well‐Controlled Co(II)/Co(III) Redox Buffer as Solid Contact

Author(s) -

Zou Xu U.,

Chen Li D.,

Lai ChunZe,

Bühlmann Philippe

Publication year - 2015

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.201400274

Subject(s) - reference electrode , electrode , redox , buffer (optical fiber) , standard hydrogen electrode , quinhydrone electrode , reproducibility , chemistry , analytical chemistry (journal) , materials science , membrane , absolute electrode potential , electrochemistry , ionic bonding , working electrode , inorganic chemistry , buffer solution , ionic liquid , chromatography , ion , organic chemistry , telecommunications , biochemistry , computer science , catalysis

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 ° of these reference electrodes is not sample dependent and exhibits a good electrode‐to‐electrode reproducibility, with a standard deviation as low as 2.1 mV.

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