Abstract
A polypyrrole-mercury/mercury chloride reference electrode was initially constructed by in situ electropolymerization of pyrrole on a mercury pool anode in a 0.5 M sodium para-toluene sulfonate and 1.0 M sodium chloride mixture solution. However, in this procedure, insufficient amount of mercury was incorporated in the polypyrrole film for reaction with chloride ions to yield a mercury/mercury chloride half cell. Alternatively, a polypyrrole film was galvanostatically deposited on a glassy carbon electrode in the presence of sodium para-toluene sulfonate. Mercury was electrochemically deposited from mercury(I) nitrate at the polypyrrole-coated electrode. The resulting film was deprotonated in 5 M NaOH. Cyclic voltammetry was then carried out in 10 M HCl in order to exchange the para-toluene sulfonate ions with chloride ions and to oxidize mercury for the formation of mercury chloride within the film. A reproducible null potential difference was obtained when the polypyrrole-mercury/mercury chloride electrode was employed as an indicator electrode against a saturated calomel reference electrode in saturated potassium chloride solution.
Original language | English |
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Pages (from-to) | 2561-2565 |
Number of pages | 5 |
Journal | Polymer |
Volume | 38 |
Issue number | 10 |
DOIs | |
Publication status | Published - May 1997 |
Keywords
- acid-basetreatments of polypyrrole
- polypyrrole
- polypyrrole-mercury/mercury chloride reference electrodes
- potentiometric measurements
- saturated calomel electrodes