Hierarchical carbon nanotube hybrid films for high-performance all-solid-state supercapacitors

Abstract

A hierarchical hybrid film of carbon nanotubes varying largely in diameter were prepared for high-performance supercapacitors.

Hierarchical Carbon Nanotube Hybrid Films Modified Gas Diffusion Layer for High-Performance Proton-Exchange Membrane Fuel Cells

“…The number of larger pores increases as the content of MWCNTs increases. The relatively larger-diameter rigid MWCNTs pack loosely, 39 thus forming abundant macropores as gas-transfer paths to accelerate the diffusion of reactants from GDL to CL. In addition, to more visually observe the change of the pores on the surface of SMFs, the pore distribution obtained via image processing with ImageJ software is shown in Figure S3.…”

“…36−38 However, due to the weaker van der Waals force between MWCNTs compared with SWCNTs, it is difficult to fabricate a continuous and robust MWCNT film. 39,40 multifunctional GDL with CNT films capable of retaining water in dry conditions and efficiently transferring gas under high current density. Herein, we report a strategy based on the SWCNT/ MWCNT hybrid films as a functional layer between GDS and hydrophobic MPL by a facile vacuum filtration method.…”

“…Carbon nanotubes (CNTs) can potentially outperform the traditional hydrophilic substance due to their high electrical conductivity. − It has been demonstrated that the porous CNT films significantly ameliorate water storage and contact resistance. − The assembling structure ,, of CNT films is associated closely with the performance of GDLs. Generally, the huge aspect ratio of single-walled CNTs (SWCNTs) is prone to assemble a porous film with good water absorption, but the dense pores can result in low gas permeability. ,− While the multiwalled CNT (MWCNT) films with larger pores can accelerate gas diffusion. − However, due to the weaker van der Waals force between MWCNTs compared with SWCNTs, it is difficult to fabricate a continuous and robust MWCNT film. , Hence, it is necessary to design multifunctional GDL with CNT films capable of retaining water in dry conditions and efficiently transferring gas under high current density.…”

Pyrene-based covalent organic polymers with nano carbonaceous composites for efficient supercapacitive energy storage

“…The Py-DSDA-COP/SWCNTs showed higher specic capacitance than Py-DSDA-COP/MWCNTs, possibly due to the higher EDLC behavior, higher conductivity, and lower diameter of SWCNTs than those of MWCNTs and C60. 61,62 In addition, based on TEM images, the successful dispersion of Py-DSDA-COP within SWCNTs results in enhanced ion mobility within the nanotubes, leading to improved ion migration efficiency and an increased capacitance. Moreover, the specic capacitance of Py-DSDA-CO' didn't enhance much by incorporating C60, due to their poor interaction as discussed above in the TEM analysis.…”

Synthesis of advanced carbon nanomaterials from renewable and waste carbon sources

“…Among synthesized composites, the highest N content could be obtained for 1EVA/1PU-C/ZIF-p. The reason behind could be that few-walled and multi-walled CNT hybrids network enhance active materials (ZIF-p) loading as MWCNTs with larger diameter favored the formation of a loose and rigid network which helps separate agglomerated SWCNTs and maximize the accessible surface area of CNT network to provide sufficient active sites for ZIF nucleation [304,334]. In this respect, by adjusting plastic feedstock composition, pyrolysis gas quantity and composition as well as desirable CNT properties can be controlled.…”