High-performance symmetric electrochemical capacitor based on graphene foam and nanostructured manganese oxide

J Solid State Electrochem

Fabiane

Momodu

et al. 2014

We report on a non-covalent functionalization of graphene foam (GF) synthesised via chemical vapor deposition (CVD). The GF was treated with pyrene carboxylic acid (PCA) which acted as a source of oxygen and/ or hydroxyl groups attached to the surface of the graphene foam for its electrochemical performance improvement.The modified graphene surface enabled a high pseudocapacitive effect on the GF. A specific capacitance of 133.3 F g -1 , power density ∼145.3 kW kg -1 , and energy density ∼4.7 W h kg -1 was achieved based on the functionalized foam in 6 M KOH aqueous electrolyte. The results suggest that non-covalent functionalization might be an effective approach to overcome the restacking problem associated with graphene electrodes and also signifies the importance of surface functionalities in graphene based electrode materials.

“…In comparison with device made from the GF, the specific capacitance and energy density were found to be orders of magnitude smaller in values as shown in our previous work [48].…”

Section: Figure 3 Raman Spectra Of As Grown Gf and Functionalized Gf supporting

confidence: 63%

Functionalized graphene foam as electrode for improved electrochemical storage

J Solid State Electrochem

Fabiane

Momodu

et al. 2014

“…Graphene foam (GF) was synthesized on nickel foam template with 420 g/m 2 in area density and 1.6 mm in thickness, using CVD technique as previously reported [24,25].. performed at 400 °C in argon. After annealing, the sample was again rinsed with deionized water and dried at 50 °C in an electric oven.…”

Section: Materials Preparationmentioning

confidence: 99%

Preparation and characterization of poly(vinyl alcohol)/graphene nanofibers synthesized by electrospinning

Barzegar

Journal of Physics and Chemistry of Solids

Fabiane

et al. 2015

Self Cite

We report on the synthesis and characterization of electrospun polyvinyl alcohol (PVA)/graphene nanofibers. The samples produced were characterized by Raman spectroscopy for structural and defect density analysis, scanning electron microscopy (SEM) for morphological analysis, and thermogravimetric (TGA) for thermal analysis.SEM measurements show uniform hollow PVA fibers formation and excellent graphene dispersion within the fibers, while TGA measurements show the improved thermal stability of PVA in the presence of graphene. The synthesized polymer reinforced nanofibers have potential to serve in many different applications such as thermal management, supercapacitor electrodes and biomedical materials for drug delivery.

“…Scheme 1 presents the preparation process of carbons. Graphene foam (GF) with a three dimensional network and relatively low defect density ( Figure S1 (a)) was first prepared by chemical vapor deposition (CVD) following the procedure used in our previous work [17]. The hydrogel was synthesised via the hydrothermal process.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Barzegar

Fashedemi

et al. 2015

Electrochimica Acta

Self Cite

A scalable production of high surface area nanoporous carbon material (~ 2994 m 2 g -1 ) with good distribution of micro-, meso-and macro-pores was hydrothermally synthesized using both cheap polymers and graphene foam as carbon sources. The as synthesised material shows a unique interconnected porous graphitic structure. The electrochemical double-layer capacitor fabricated from this nanoporous carbon material exhibited a superior supercapacitive performance of 188 F g -1 at current density 0.5 A g -1 . This corresponded to areal capacitance of 6.3 µF cm -2 coupled with a high energy of 0.56 µWh cm -2 (16.71 Wh kg -1 ) and a power density of 13.39 µW cm -2 (401 W kg -1 ) due to extended potential window of 1.6 V in KOH aqueous electrolyte. Moreover, no capacitance loss after 10,000 cycles was observed, owing to the 2 unique structure and large surface area of the active material. The outstanding performance of this material as supercapacitor electrode shows that it has great potential for high performance energy-related applications.