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From upcycled waste polyethylene plastic to graphene/mesoporous carbon for high-voltage supercapacitors.

08:00 EDT 3rd September 2019 | BioPortfolio

Summary of "From upcycled waste polyethylene plastic to graphene/mesoporous carbon for high-voltage supercapacitors."

We report a successful design and synthesis method for developing a graphene/mesoporous carbon (G@PE40-MC700) electrode materials from upcycled waste polyethylene (PE) plastic combined with graphene oxide (GO) and flame retardant by low-temperature carbonization at 700 °C. The G@PE40-MC700 exhibits a high surface area (1175 m g) and a considerable amount of mesopores (2.30 cm g), thus improved electrochemical performance in both symmetric and hybrid supercapacitors with wide voltage windows. The hybrid supercapacitor assembled from G@PE40-MC700 as anode and LiMnO as cathode operating at 2.0 V in 0.5 M LiSO was investigated. The hybrid supercapacitor delivers an energy density of 47.8 Wh kg at a power density of 250 W kg, as well as high cycling stability of 83.8 % after 5000 cycles. Furthermore, the much higher energy density of 63.3 Wh kg by using G@PE40-MC700 as electrode material was achieved in high-voltage (4.0 V) symmetric supercapacitors using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF) as the electrolyte with enhanced cycling stability of 89.3% after 5000 cycles. The high capacitance and rate capability of G@PE40-MC700 can be attributed to the synergistic effect of graphene and the mesoporous carbon composites. Our work not only offers a sustainable approach to turn waste plastic into valuable carbon materials but also an opportunity for its applications in "gold capacitors."

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Journal Details

This article was published in the following journal.

Name: Journal of colloid and interface science
ISSN: 1095-7103
Pages: 55-64

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A vinyl polymer made from ethylene. It can be branched or linear. Branched or low-density polyethylene is tough and pliable but not to the same degree as linear polyethylene. Linear or high-density polyethylene has a greater hardness and tensile strength. Polyethylene is used in a variety of products, including implants and prostheses.

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