Abstract
Polypyrrole (pPy) electrodes containing polysulfonated aromatic anions are investigated by cyclic voltammetry as electrodes for use in electrochemical supercapacitors. These ‘ladder-doped’ materials are deposited as thick films (ca. 10 μm) having open structures that permit the rapid insertion/ejection (up to 300 mV s−1) of cations and anions from aqueous solution, and give an effective or ‘geometric’ capacitance of up to 0.40 F cm−2. The ‘dual mode’ doping behaviour seems essential for good capacitive response. These electrodes show a remarkable tendency to perform better at high cycling rates, an effect attributed to the way the structure ‘self-organises’ during the self-doping process. Good electrode response depends on protecting the open structure containing hydrophilic ion-conducting channels.
Original language | English |
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Pages (from-to) | 107-112 |
Number of pages | 6 |
Journal | Journal of Power Sources |
Volume | 129 |
Issue number | 1 |
Early online date | 23 Dec 2003 |
DOIs | |
Publication status | Published - 15 Apr 2004 |
Bibliographical note
We thank EPSRC and DERA (UK) for financial support, Amanda Pappin (Aberdeen University), Roger Latham (De Montfort University), and Kevin Greene (DERA) for helpful discussions and practical support.Keywords
- Supercapacitors
- Polypyrrole
- Dual mode behaviour
- Hydrophilic channels