Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 16, Issue 10, Pages 3299-3305Publisher
SPRINGER
DOI: 10.1007/s10008-012-1772-x
Keywords
Low melting point solid ionic liquid; Carbon ionic liquid electrode; Glucose oxidase; Enzymatic activity
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Funding
- State Key Laboratory of Microbial Technology of China
- Provincial Natural Science Foundation of Shandong [Y2008B13]
- National Natural Science Foundation of China [20973103, 21173133]
- National Basic Research Program of China [2011CB707400]
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A new carbon ionic liquid electrode (CILE) has been constructed using a low melting point (39 A degrees C) hydrophobic ionic liquid (IL) 1-propyl-3-methylimidazolium hexafluorophosphate ([Pmim][PF6]) as the binder. Both cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that, in addition to the composition optimization of the IL/graphite composite, heating the composite at a temperature a little higher than the melting point of [Pmim][PF6] can also lower the background current and enhance the mechanical strength of the CILE. The heated CILE is more sensitive than the traditional carbon paste electrode for the detection of H2O2. Glucose oxidase (GOx) can be easily entrapped in the bulk IL/graphite composite. Heating the GOx-modified CILE (GOx-CILE) at the melting point of [Pmim][PF6] does not lower the catalytic activity of GOx. As compared with n-octylpyridinium hexafluorophosphate (melting point 65 A degrees C) as the binder, [Pmim][PF6]-based CILE is much better in signal-to-noise ratio. Under the optimum conditions, the [Pmim][PF6]-based GOx-CILE has a linear amperometric response to glucose over a concentration range of 2.0-26 mM with the detection limit as low as 0.39 mM. It follows that choosing an IL with a melting point of ca. 40 A degrees C as a binder to fabricate enzyme-entrapped CILEs is a good strategy for the enhancement of the performance of the electrode.
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