Development of a carbon composite electrode made from polyethylene and graphite powder modified with copper(I) oxide
✍ Scribed by Tommaso R.I. Cataldi; Diego Centonze
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 804 KB
- Volume
- 326
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Solid carbon composite electrodes (CCEs) prepared by copper(I) oxide (Cu,O) dispersed in polyethylene and graphite powder have been investigated for use as working electrode in amperometric flow-through detection in alkaline solutions. The effects of matrix composition, electrocatalyst loading, short-and long-term electrode stability, noise current, and sensitivity were assessed using o-mannitol as a model compound. Excellent sensitivity accompanied by a low residual current was observed with a 50% (w/w) Cu20 loading level in the carbon paste matrix. An estimate value of the double layer capacitance. evaluated by cyclic voltametry in 0.48 M NaOH, was about 1360 uF/mm2. Upon optimizing the sensing electrode in terms of composite electrode formulation, hydroxide ion concentration, and operating potential. the detection limit for u-mannitol in flow injection mode, using a wall-jet flow cell, was 5 uM for 50 ~1 injections. The bulk Cu20-CCEs exhibit good mechanical stability under forced flow hydrodynamic conditions, and overall offers the advantage of a very low background current. An additional inherent feature of these catalyst-modified electrodes is their renewal capability; the surface can rapidly be renewed by a simple polishing procedure making the amperometric sensor very attractive for routine quantitative measurements.