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Polypyrrole (PPy) was prepared with the aid of FeCl3 as the oxidant. In a typical synthesis, 3 g of pyrrole (recently distilled under nitrogen) was added to a solution of FeCl3 (0.5 M, 200 mL) and the mixture was magnetically stirred for 2 h. The formed polypyrrole was separated by filtration and abundantly washed with distilled water and dried. The polypyrrole yield was close to 100%. The chemical activation of polypyrrole was per- formed by heating (at a ramp rate of 3 C min1 ) a KOH/PPy mixture (at a KOH/PPy weight ratio of 2 or 4) under nitrogen to a final temperature of between 600 and 850 C for 1 h. The activated samples were then thoroughly washed with 10 wt%HCl to remove any inorganic salts, and then with distilled water until neutral pHand then dried in an oven at 120 C. The carbons were denoted as CP-x-y, where x is the KOH/PPy weight ratio and y the activation temperature (in C) |
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