Carbon Nanotube@N‐Doped Mesoporous Carbon Composite Material for Supercapacitor Electrodes

Abstract

Here, carbon nanotube@N-doped mesoporous carbon (CNT@N-PC) composites were synthesized by using resorcinol-formaldehyde resin as carbons ource,i onic liquids (ILs) as template, and nitrogens ourcesa nd tetraethyl orthosilicate (TEOS) as assistant agent.T he use of ILs-modified CNT with nitrogen and TEOS facilitated the generation of a richer mesoporous structure. Theo btained CNT@N-PC was composed of aC NT core and mesoporous carbon particles around it.C NT@N-PC showed a3 Dn etwork structure like "dewy cobwebs" and had ah igh surface area of 857 m 2 g À1 , uniform pore size distribution (3.0 nm), ands uitable Nc ontent (4.9 at.%). When used as supercapacitor electrode, the CNT@N-PC exhibited ah igh specific capacitance (244 Fg À1 at 1Ag À1 ), good rate capability and favorable capacitance retention (92.5 %c apacitive retention after 5000 cycles), demonstrating the potentialf or application in high-performance supercapacitors.[a] X.

Post‐synthetic Modification of Covalent Organic Frameworks through in situ Polymerization of Aniline for Enhanced Capacitive Energy Storage

“…The electronic charge density on heteroatoms in the frameworks having a high specific surface area facilitates the ionadsorption, enhancing the double-layer capacitance. [20,21] Besides, the electroactive building units, like N-rich triazine cores, improve the relative permittivity of the electrode materials and contribute to the pseudocapacitance. [22,23] Herein, we synthesized two triazine-based covalent organic frameworks via a solvothermal Schiff-base polycondensation-TCOF-1, by combin-ing C 2 and C -symmetric (triazine) building units, and TCOF-2, connecting two C 3 -symmetric triazine units ( Figure 1a).…”

Highly Stable Dispersion of Carbon Nanotubes in Deep Eutectic Solvent for the Preparation of CNT‐Embedded Carbon Xerogels for Supercapacitors

“…In general, the boosted electrochemical performance of O‐D‐CNT@RFC might be attributed to the following reasons:(1) The well dispersed MWCNT in the carbon matrix in O‐D‐CNT@RFC basically endows the materials with improved conductive network, while the etching effect of the acid treatment further provides a smaller resistance and shorter diffusion pathways for the hybrid carbons . (2) In contrast with the carbon xerogel prepared in aqueous condition, materials prepared in DES using ambient drying possess more developed porous structure, which is essential for transporting and storing the ions of the dissociated electrolyte …”

Progress in supercapacitors: roles of two dimensional nanotubular materials

“…412 Some of the recent developments in high-performance supercapacitors using nanotubular networks have opened a new avenue for exploring techniques, specically electrode characterization and modulations, to achieve high power density, capacity retention, and good cyclability. 215,216,[223][224][225][226][227]264,386, Although the advancements and implementations of nanotubular networks in supercapacitors have signicantly achieved better storage capabilities and performance, tailoring and optimization of materials are still in a developmental phase where cost-effectiveness and good performance are some of the key concerns in practical applicability. In an attempt to develop a combination of high power and energy densities, hybrid technology is one of the challenging aspects.…”

“…The 1 st category [191][192][193][194][195][196][197] consists of supercapacitors with low energy density (0-10 W h kg À1 ) and specic capacitance below 100 F g À1 , the 2 nd category 54,56,196,[198][199][200][201][202][203][204][205][206][207][208] consists of supercapacitors with energy density in the range of 10-40 W h kg À1 , the 3 rd category [209][210][211] consists of supercapacitors with an energy density range of 70-100 W h kg À1 , and the 4 th category [212][213][214] consists of supercapacitors with energy density from 140-160 W h kg À1 and the description of the materials is tabulated in Table 3. Recent progress in CNT based high-performance supercapacitors has been immensely investigated using various techniques [215][216][217][218][219][220][221][222][223][224][225][226][227][228][229][230] and more systematic investigations ar...…”