Abstract
Electrosynthesis of polypyrrole (PPy) was studied in aqueous lithium iodide solution. The electrochemical polymerization showed features of two-dimensional growth and the reaction was catalyzed by the I-2/I- couple. The potentiometric response of PPy doped with iodide (PPy(I)) was studied both in iodide solutions and solutions containing the redox couple I-2/I- with a fixed concentration ratio 0.4 but varying the initial concentration of iodide in the range 10(-5)-1.0 M. Linear, anionic response was observed in the concentration range 10(-1)-10(-3) M when only iodide species was present. However, contribution of the redox response to the overall potentiometric response increased with increasing concentration of I-2 although the concentration ration between iodine/iodide was kept constant. The influence of phosphate buffer on the electroactivity of PPy doped with iodide was also studied.
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 217–225 |
| Number of pages | 9 |
| Journal | Analytica Chimica Acta |
| Volume | 355 |
| Issue number | 2-3 |
| DOIs | |
| Publication status | Published - 1997 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- iodide
- iodine
- phosphate buffer
- polypyrrole
- potentiometry
- two-dimensional growth