دانلود رایگان مقاله الکترود بر اساس پلی پیرول / گرافن / کاغذ سلولز باکتریایی برای ابرخازن

Abstract

A simple and low-cost approach toward flexible and freestanding electrode is developed. The method involves coating the polypyrrole (PPY) encapsulated graphene (RGO) composites on bacterial cellulose, from which large mass loading of 8.93 mg cm−2 is obtained. Benefiting from the well structural features, the flexible PPY/RGO/BC paper can be directly acted as supercapacitor electrode without metallic current collectors, binder and additives, and achieves a high areal capacitance (2100 mF cm−2 at 2 mA cm−2), good rate performance (1570 mF cm−2 retention at 50 mA cm−2) and high flexibility (suitable for arbitrary angles, even 180°). Moreover, the assembled symmetric supercapacitor delivers as high as 790 mF cm−2 of areal capacitance and 0.11 mWh cm−2 of energy density. Therefore, this strategy provides a facile method for design of flexible supercapacitor electrodes with high areal capacitance.

4. Conclusions

In summary, a flexible and freestanding PPY/RGO/BC electrode is designed and fabricated in a simple, low-cost and effective approach. Comparing with conventional strategy of direct electropolymerization or chemical polymerization onto film, the proposed method achieves several advantages in terms of large areal mass of 8.93 mg cm
2 , high areal capacitance (2100 mF cm
2 ) and high flexibility. Moreover, the assembled symmetric supercapacitor delivers as high as 790 mF cm
2 of areal capacitance and 0.11 mWh cm
2 of energy density. These advantages make this hybrid paper a promising electrode for application in flexible energy storage devices.