What is graphene fiber/fabric based supercapacitors?

Graphene fiber/fabric is a very competitive substrate for flexible electrodes with exceptional electrochemical and mechanical properties. Herein, the recent progress on graphene fiber/fabric-based supercapacitors is reviewed, focusing on the fabrication of graphene fiber elements, the control of fiber structure, and the preparation of fabrics.

What are three-ply core-sheath graphene fiber supercapacitors?

Three-ply core-sheath graphene fiber supercapacitors with thin and continuous wrinkling gel electrolyte interlayer, which are fabricated by a facile and direct spinning through an elaborately designed spinneret with a coaxial three-channel structure, show high specific capacitance, cycling stability and energy density. 1. Introduction

What is the phase angle of a graphene nanosheet capacitor?

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°.

Why is CNT a good conductor of graphene?

The uniform distribution of CNT within the fiber prevents the stacking of graphene sheets, allowing the composite fiber to exhibit a SSA of 396 m 2 /g and a conductivity of 10,200 S/m. The large SSA and conductivity results in a large electrochemical active area (ion-accessible surface) and a capacitance of up to 305 F/cm 3.

What is the capacitance of a graphene-Pani composite?

The hybrid type film presents a gravimetric capacitance of 233 F g −1 and a volumetric capacitance of 135 F cm −3. Similarly, Wei et al. synthesized a graphene-PANI composite by a polymerization method, where graphene (∼15 wt %) was homogeneously coated on to PANI sheets .

How strong are graphene fibers?

The results of small-angle X-ray scattering demonstrated that graphene fibers had an OD of 81% and ultrahigh strength of 1.45 GPa. Alternatively, it appears that the structure of spinning microchannels will similarly affect the OD of graphene fibers.