Homogeneous Elongation of N‐Doped CNTs over Nano‐Fibrillated Hollow‐Carbon‐Nanofiber: Mass and Charge Balance in Asymmetric Supercapacitors Is No Longer Problematic

Abstract

The hurdle of fabricating asymmetric supercapacitor (ASC) devices using a faradic cathode and a double layer anode is challenging due to the required large amount of active mass of anodic material compared to that of the cathodic material during mass balancing due to the large difference in capacitance values of the two electrodes. Here, the problem is addressed by engineering a negative electrode that furnishes an ultrahigh capacitance. An in situ developed metal-organic framework (MOF)-based thermal treatment is adopted to grow highly porous N-doped carbon nanotubes (CNTs) containing submerged Co nanoparticles over nano-fibrillated electrospun hollow carbon nanofibers (HCNFs).

Ti3C2Tx MXene embedded metal–organic framework-based porous electrospun carbon nanofibers as a freestanding electrode for supercapacitors

“…When the value of b is equal to 0.5, the reaction is predominantly diffusioncontrolled due to the faradaic intercalation process, while when the b value approaches 1, the process is capacitive nonfaradaic due to the surface phenomenon. 65,66 For the present work, the value of b was found to be 0.929, which indicates that the charge storage mechanism of the material is predominantly Journal of Materials Chemistry A Paper capacitive nonfaradaic. Furthermore, the percentage contribution from the capacitive process (k 1 n) and diffusion controlled process (k 2 n 1/2 ) at different scan rates was calculated using eqn (3):…”

“…61 Furthermore, oxygen present in the graphitic carbons also contributes to some pseudocapacitance. 65 This shows that MXene-integrated nanoporous carbon has a synergistic advantages of a high surface area, sufficient active sites, hydrophilicity, and conductivity for charge storage.…”

Planar micro-supercapacitors toward high performance energy storage devices: design, application and prospects

“…Besides, the potential window can be expanded by assembling an asymmetric device to match the operating voltage of pseudocapacitive materials and EDLC materials for an enhanced energy density. 29–31…”

Bimetallic CoMoO4 Nanosheets on Freestanding Nanofiber as Wearable Supercapacitors with Long-Term Stability

“…Therefore, the fabrication of electrodes without a metallic substrate is of great interest to the energy storage community. Electrospinning is a facile technique for meeting this demand [9][10][11]. Electrospun carbon nanofibers (CNFs) with superior electrical properties can be used as freestanding and lightweight supercapacitors without the use of metallic substrates [12].…”