Influence of counterion charge on the electrochemistry and impedance of polypyrrole
| Autor: | Peter G. Pickup, Abdul-Rahman Al-Betar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Supercapacitor
chemistry.chemical_classification Materials science Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Polypyrrole Electrochemistry 01 natural sciences 0104 chemical sciences Ion chemistry.chemical_compound chemistry Chemical engineering Ionic conductivity General Materials Science Electrical and Electronic Engineering Counterion 0210 nano-technology Anion binding |
| Zdroj: | Journal of Solid State Electrochemistry. 24:2741-2749 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-020-04575-5 |
| Popis: | Polypyrroles doped with multiply charged anions are becoming increasingly important in a wide range of energy, environmental and biomedical applications. The increased counterion charge promotes anion binding and retention and can significantly increase stability and performance. The electrochemical properties of polypyrrole films prepared galvanostatically in Na2SO4 (PPySO4) where found to be similar those of PPyClO4 prepared in NaClO4, although there was significantly more anion retention during potential cycling. In contrast, PPyPO4 films prepared in Na3PO4 under the same conditions were over-oxidised and more dense, which is beneficial for corrosion protection and electroanalysis. Paradoxically, the low mobility of SO42− counterions results in more facile charging and discharging of the film, as observed with large and polymeric counterions. This can create significant benefits in applications that require fast cycling, such as supercapacitors and high-rate batteries. These conclusions are corroborated by electrochemical impedance measurements in various aqueous electrolytes. Ionic conductivity was dominated by anion transport for both PPyClO4 and PPySO4, whilst PPyPO4 was predominantly a cation conductor. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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