Transparent and Self-Supporting Graphene Films with Wrinkled- Graphene-Wall-Assembled Opening Polyhedron Building Blocks for High Performance Flexible/Transparent Supercapacitors

Abstract

Improving mass loading while maintaining high transparency and large surface area in one self-supporting graphene film is still a challenge. Unfortunately, all of these factors are absolutely essential for enhancing the energy storage performance of transparent supercapacitors for practical applications. To solve the above bottleneck problem, we produce a novel self-supporting flexible and transparent graphene film (STF-GF) with wrinkled-wall-assembled opened-hollow polyhedron building units. Taking advantage of the microscopic morphology, the STF-GF exhibits improved mass loading with high transmittance (70.2% at 550 nm), a large surface area (1105.6 m/g), and good electrochemical performance: high energy (552.3 μWh/cm), power densities (561.9 mW/cm), a superlong cycle life, and good cycling stability (the capacitance retention is ∼94.8% after 20,000 cycles).

Piezoresistive Pressure Sensor Based on Synergistical Innerconnect Polyvinyl Alcohol Nanowires/Wrinkled Graphene Film

“…The D-band is usually caused by phonon scattering at the defect sites, representing some disordered structure, whereas the G-band is commonly employed to express the integrity of SP 2 hybrid bond structures in graphite materials. [25] In our work, the D-band appears at 1346.2 cm −1 , implying a great deal of defects in the graphene layers, and the G-band generates at near 1585.5 cm −1 , suggesting the formation of a hexagonal lattice in graphene. Figure 2a-c and d-f reveals the thermal field scanning electron microscopy (SEM) (Nova Nano SEM 450, 10 kV) images of wrinkled GO film and rGO film, respectively.…”

“…In general, two main characteristic peaks “D” and “G” of graphene could be found. The D‐band is usually caused by phonon scattering at the defect sites, representing some disordered structure, whereas the G‐band is commonly employed to express the integrity of SP 2 hybrid bond structures in graphite materials . In our work, the D‐band appears at 1346.2 cm −1 , implying a great deal of defects in the graphene layers, and the G‐band generates at near 1585.5 cm −1 , suggesting the formation of a hexagonal lattice in graphene.…”

Carbon-Based Nanomaterials/Allotropes: A Glimpse of Their Synthesis, Properties and Some Applications

“…The uniqueness of carbon nanostructures (especially graphene) that attracted attention of the scientific communities is directly linked to its intrinsic strength, confirmed to exceed that of any other material [ 153 ], which is about 200 times that of steel but yet is malleable. Additionally, it is about 97% transparent when pure [ 154 ], very stable, and chemically inert materials with an abundant surface area that can be stretched by about 20% [ 155 ]. This and many other qualitative properties made graphene a ‘very good candidate’ more especially as energy storage material.…”

A single step strategy to fabricate graphene fibres via electrochemical exfoliation for micro-supercapacitor applications

“…The urgent need to improve energy conversion and storage efficiency continues to attract tremendous attention. [1][2][3][4][5][6][7][8][9][10][11][12][13] One consensus identified in this field is the need to develop lightweight, wearable, low-cost and high performance supercapacitors. [14][15][16][17] A variety of materials have been explored to fabricate supercapacitor electrodes and have achieved promising performance.…”