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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."
This article was published in the following journal.
Name: Journal of colloid and interface science
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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.
Polymers of organic acids and alcohols, with ester linkages--usually polyethylene terephthalate; can be cured into hard plastic, films or tapes, or fibers which can be woven into fabrics, meshes or velours.
Waste products which, upon release into the atmosphere, water or soil, cause health risks to humans or animals through skin contact, inhalation or ingestion. Hazardous waste sites which contain hazardous waste substances go here.
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A process of waste disposal involving the conversion of green waste (i.e. leaves, organic matter, food waste, manure) into soil-enhancing matter.