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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Dong, Miaomiao Sun, Kanjun Zhao, Guohu Lei, Ziqiang Ma, Guofu Feng, Enke Peng, Hui |
| Copyright Year | 2015 |
| Abstract | A novel gel polymer, polyvinyl alcohol-orthophosphoric acid-2-mercaptopyridine (PVA-H3PO4-PySH), is prepared through introducing redox-mediated 2-mercaptopyridine into a polyvinyl alcohol-orthophosphoric acid host, and a solid state supercapacitor is fabricated using the gel polymer as an electrolyte and a separator and using activated carbons as electrodes. The PVA-H3PO4-PySH gel polymer was shown to have excellent stretching and bending properties. The electrochemical properties of the supercapacitor are investigated by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. Surprisingly, electrode specific capacitance (1128 F g−1) and energy density (39.17 W h kg−1) are increased by 447% by introducing PySH as the redox mediator in the PVA-H3PO4 gel polymer. The supercapacitor with the PVA-H3PO4-PySH gel polymer shows an excellent capacitance retention of 80% for over 1000 cycles. Simultaneously, the ionic conductivity of the gel polymer electrolyte increased by 92% up to 22.57 mS cm−1 compared to that of the PVA-H3PO4 system. These improved performances are owed to the redox reaction between 2-mercaptopyridine (PySH) and 2,2′-bipyridine (PySSPy) redox couples in the PVA-H3PO4-PySH gel electrolyte, indicating the supercapacitor combines the double-layer characteristic of carbon-based supercapacitors and the faradaic reactions characteristic of batteries' energy-storage processes. |
| Starting Page | 22419 |
| Ending Page | 22425 |
| Page Count | 7 |
| File Format | HTM / HTML PDF |
| ISSN | 20462069 |
| Volume Number | 5 |
| Issue Number | 29 |
| Journal | RSC Advances |
| DOI | 10.1039/c4ra15484c |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Spectroscopy Electrode Redox Polymer Energy density Cyclic voltammetry Electrolyte Bipyridine Supercapacitor Electrochemistry Faradaic current Capacitor Electrical impedance |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
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