Solid-state supercapacitors were fabricated by sandwiching poly(vinyl alcohol) (PVA)/H 3 PO 4 solid-state electrolyte between two symmetric electrode films. …
Wang et al. 51 successfully prepared zinc-guided 3D porous graphene through a zinc-assisted solid-phase pyrolysis route. The graphene exhibited a high specific surface area and abundant microporous and mesoporous structures, demonstrating good specific capacitance and cycling stability as an electrode material for supercapacitors.
Figures 1a–c illustrate the procedure for crumpling graphene papers bonded on elastomer films. A square-shaped elastomer film, VHB acrylic 4910 with thickness of 1 mm (0.104 g mm −2, 3M Inc ...
DOI: 10.1016/j.jechem.2023.01.031 Corpus ID: 256565492; Mechanically flexible reduced graphene oxide/carbon composite films for high-performance quasi-solid-state lithium-ion capacitors
Thus, power performance of this capacitor increases with operating temperature, which is opposite to the behavior exhibited by many conventional electrolytic and film capacitors. A primary need is a solid-state ionic liquid electrolyte suitable for the planar VOGN electric double layer capacitor with stable operation up to 125°C.
At 120 Hz, the impedance phase angle of the graphene nanosheet capacitor was approximately –82° as compared with ~0° for the activated carbon capacitor and approximately –83° for the aluminum electrolytic capacitor. The phase angle for a blank (bare Ni electrode prototype) was –85°. ... Solid-State Lett. 10, A106 (2007). Crossref ...
Carbon nanotube@manganese oxide nanosheet core-shell structure encapsulated within reduced graphene oxide film for flexible all-solid-state asymmetric supercapacitors ... A highly flexible all-solid-state asymmetrical supercapacitor is assembled with GCM as the positive electrode and holey graphene film spaced with …
A flexible solid-state asymmetric supercapacitor based on bendable film electrodes with 3D expressway-like architecture of graphenes and "hard nano-spacer" is fabricated via an extended filtration ...
Graphene has been extensively utilized as an electrode material for nonaqueous electrochemical capacitors. However, a comprehensive understanding of the charging mechanism and ion arrangement at ...
1. Introduction. Supercapacitors, also known as the electrochemical capacitors or ultra-capacitors, have attained huge attention and recognition due to their outstanding characteristics such as the high specific power (500-10,000 W/kg), exceptional charge/ discharge performance and the tendency for a longer lifetime (>500,000 cycles) …
Mechanically flexible reduced graphene oxide/carbon composite films for high-performance quasi-solid-state lithium-ion capacitors. Author links open overlay …
Substantial differences in charge storage mechanisms exist between dielectric capacitors (DCs) and electrochemical capacitors (ECs), resulting in orders of magnitude difference of stored charge density in …
Graphene-based solid-state supercapacitors have the physical flexibility, which is an essential requirement in modern electronic devices [13]. ... The calculated capacitance was 397 F/g for the capacitor structure with N-rGO film electrodes at a scan rate of 10 mV s −1 and the capacitance decreased upon increasing the scan rate. The …
Jiang et al. reported a solid state flexible hybrid SC utilizing screen printable films of graphene/CoS 2 /Ni 3 S 4. They achieved an energy density of 44.9 Wh …
Graphene/CPs film can be assembled with solid electrolyte to form a flexible supercapacitor device which can be subject to high degrees of bending or twisting without losing the device integrity. ... Han C-H, Kim W (2012) All-solid-state flexible supercapacitors based on papers coated with carbon nanotubes and ionic-liquid-based …
For example, graphene core–sheath microfibres were used to demonstrate spring-like supercapacitors that are flexible, …
Solid-state batteries (SSBs) have emerged as a potential alternative to conventional Li-ion batteries (LIBs) since they are safer and offer higher energy density. Despite the hype, SSBs are yet to surpass their liquid counterparts in terms of electrochemical performance. This is mainly due to challenges at both the materials and …
To address these challenges, a free-standing reduced graphene oxide (rGO)/carbon film with a unique sandwich structure has been designed via the …
A flexible solid-state asymmetric supercapacitor based on bendable film electrodes with 3D expressway-like architecture of graphenes and "hard nano-spacer" is fabricated via an extended filtration assisted method. ...
The devices fabricated using the graphene/g-C 3 N 4 composite electrode exhibit a specific area capacitance of 1500 mF cm −2, and 95% of initial capacitance …
Supercapacitors, with the merits of both capacitors for safe and fast charge and batteries for high energy storage have drawn tremendous attention. Recently, laser scribed graphene has been increasingly studied for supercapacitor applications due to its unique properties, such as flexible fabrication, large surface area and high electrical …
The electrolyte can be a liquid solvent or a solid-state or quasi-solid-state material 18,19. When the electrochemical performance of a material as a potential electrode is of interest, rather than the performance of the whole supercapacitor, the measurements are taken in a three-electrode configuration, as depicted in Fig. 1d. Here, the ...
Also, the volumetric capacitance (49.9 F cm −3) is higher than reported values for solid state graphene (9.6 F cm −3) 44, graphene hydrogel (31 F cm −3) 43 …
Graphene films are particularly promising in electrochemical energy-storage devices that already use film electrodes. …
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