Abstract
Electrode materials for electrochemical capacitors or supercapacitors (SCs) are widely studied, as they are needed for the development of energy storage devices in electrical vehicles and flexible electronics. In the current work, a self-supported paper of reduced graphene oxide (rGO) with polycarbonate (PC) (as rGO-PC composite) was prepared by simple vacuum filtration and low-temperature annealing. rGO-PC as a freestanding single electrode was studied in a three-electrode system and presented a capacitive energy storage mechanism. To fabricate SCs based on rGO-PC, flexible polyethylene terephthalate (PET) with layers of both Cu tape (Cu tape) and carbon tape (C tape) (PET/Cu/C), as well as PET covered by graphene ink (PET/GrI), were used as supports. Fabricated flexible symmetric SCs have shown similar behavior with a higher areal capacitance value than that on PET/Cu/C substrate.
Highlights
Graphitic carbon monolayers were observed and studied more than several decades ago
Strong peak at ~10.4°, which is characteristic for graphene oxide (GO), is and bare polycarbonate filmThe obtained from the corresponding solution on glass substrate shown in Figure 3a,b to disappear annealing at 180 a broad for comparison
Which is characteristic for°C, GO,while is shown in reduced graphene oxide (rGO)
Summary
Graphitic carbon monolayers were observed and studied more than several decades ago. Ruess and Vogt first showed just arrived electron microscopy images of few-layer graphite, accompanied by further observation of single graphene layers [4]. In 1986, Boehm et al referred to a single layer of graphite or a thin layer of sp hybridized carbon atoms arranged in a honeycomb lattice as graphene [5]. It was only in 2004 that isolated graphene was reported to be obtained using the simple scotch tape method [6]. The subsequent discoveries of its unusual properties have led to an extraordinary interest amongst researchers across almost all scientific disciplines [7,8]
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