Synthesis of morphology-tunable electroactive biomass/graphene composites using metal ions for supercapacitors

Abstract

Morphology-tunable 3D TA/graphene composites are prepared using metal ions as the morphology tuning agent, and they have promising applications in renewable energy storage devices.

1D/2D Nanomaterials Synergistic, Compressible, and Response Rapidly 3D Graphene Aerogel for Piezoresistive Sensor

“…[ 1,2 ] In general, aerogels can be prepared by chemical vapor deposition (CVD), [ 3 ] hydrothermal methods, [ 4 ] and 3D printing, [ 5 ] while they can be prepared form silica, [ 6 ] carbon nanotubes, [ 7 ] graphene, [ 8,9 ] polyimide, [ 10,11 ] Kevlar, [ 12,13 ] and natural materials [ 14–16 ] to name a few. Due to the unique structure and properties of aerogels, they can be utilized for energy storage and conversion, [ 17–19 ] sensors, [ 20,21 ] catalyst support, [ 22,23 ] environmental remediation, [ 24,25 ] and many other diverse applications.…”

Ultrasensitive Mg2+-Modulated Carbon Nanotube/Tannic Acid Aerogels for High-Performance Wearable Pressure Sensors

“…Nevertheless, Mg 2+ ions that have been introduced into the SWCNT/TA hydrogel are beneficial to construct a metal–phenolic network. The O content of Mg 2+ /SWCNT/TA 1:1 is lower than that of SWCNT/TA 3:3 , possibly due to the deoxygenation effect of Mg 2+ ions. , TA molecules that are loosely attached to the outer surface of CNTs or dissociated as clusters within the CNT network could be easily removed from gel and chelate to Mg 2+ in solution during the immersion process. The amount of TA removed from gel exceeds that involved in the metal–phenolic network due to the significantly larger content of Mg 2+ existing in the immersion solution.…”

“…Figure a shows FTIR spectra of TA, SWCNT, SWCNT/TA 3:3 , and Mg 2+ /SWCNT/TA 1:1 . Multiple absorption bands can be observed in the spectrum of TA, with the band located at 767 cm –1 correlated to multisubstituted aromatic ring vibration, the band at 1003 cm –1 corresponding to the C–O stretching vibration, the band at 1193 cm –1 ascribed to the C–O–C asymmetric stretching vibration, the band at 1479 cm –1 assigned to the C–OH in-plane bending of hydroxyl groups, the band at 1621 cm –1 attributed to the CC stretching of benzene rings, and the band at 1700 cm –1 assigned to the CO stretching vibration. , Characteristic peaks of SWCNT positioned at 1384, 1633, and 3442 cm –1 are ascribed to C–OH, CC, and O–H vibrations, respectively, verifying the presence of oxygen-containing groups introduced by acid treatment. , Characteristic peaks of CNT can also be observed in spectra of SWCNT/TA 3:3 and Mg 2+ /SWCNT/TA 1:1 , demonstrating the presence and dominancy of CNT as the skeleton of aerogels. Peaks corresponding to the C–OH vibration for SWCNT/TA 3:3 and Mg 2+ /SWCNT/TA 1:1 are located in a band in-between that of TA and CNT, which may be attributed to the hydrogen bonding between TA and CNT.…”

“…Tannic acid (TA) is a biocompatible natural polyphenolic biomolecule that contains abundant pyrogallol and catechol groups . The unique polyphenol structure of TA with multiple bonding sites can provide diverse interactions .…”

Adsorption of Cr(VI) ion on tannic acid/graphene oxide composite aerogel: kinetics, equilibrium, and thermodynamics studies

“…4a). The O content (20.56%) is dramatically reduced in TAG, due to the deoxygenation accompanied by translation of GO into graphene and the interactions between G and TA during hydrothermal assembly [43]. The C 1s peaks of G, TA, and TAG can be deconvoluted into four components, denoted as C=C/C-C (284.5 eV), C-O (286.6 eV), and C=O (289 eV).…”