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Negative potential activating polypyrrole for expanding capacitance
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DOI：10.1016/j.est.2024.114409.png)
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Abstract
En 中文
Polypyrrole (PPy) due to satisfactory conductivity and energy storage capability is one of the potential electrode candidates for supercapacitors. In this study, rolling mill is combined with in-situ polymerization of pyrrole for depositing PPy on a PVA-co-PE nanofibers coated non-woven fabric (NcF, 45 cm x 30 cm). The obtained PPy-NcF presents a good conductivity distribution (3.35 +/- 0.50 S & sdot;cm- 1). In addition, unlike conventional composition methods, a negative potential (NP) activation approach is recommended, which enhances the capacitance of PPy because the amount of electrolyte ions embedding into/escaping from PPy chains rises significantly after the activation process. The capacitances of the NP activated PPy-NcF increases to about 1.81-6.39 times when compared with that of the one without activation. By virtue of the NP activation, PPy-NcF (with mass loading of 0.74 mg cm- 2) possesses gravimetric capacitances of 147.37-124.30 F g- 1 at 0.1-0.4 mA, which is similar to the control sample (with mass loading of 2.06 mg cm- 2, without the NP activation). Besides, the NP activation can also reanimate the capacitances of PPy-NcF electrode that is left unused for 75 days from below 17.54 F g- 1 to 150.90-138.41 F g- 1. The recommended NP activation is expected to upgrade other PPy-based electrodes, which is universally applicable.
Keywords:
Supercapacitors
Polymers
Activation
Doping
Potential
Journal
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9.8
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2.2W
Citations:
10.1W