Facile synthesis of bacterial cellulose fibres covalently intercalated with graphene oxide by one-step cross-linking for robust supercapacitors

Abstract

Electrode materials with a three-dimensional (3D) network structure and high-conductivity are crucial for the development of robust high-performance supercapacitors. Herein, a facile method has developed for the covalent intercalation of graphene oxide (GO) with bacterial cellulose (BC) fibers via one-step esterification to construct a 3D cross-linked structural scalffords. The as-prepared composite exhibits a tensile strength of 18.48 MPa and an elongation at break of 24%. With an outstanding electrical 10 conductivity of 171 S m -1 , the composite electrode demonstrates a good mass-specific capacitance of 160 F g -1 at 0.4 A g -1 current density. Robust supercapacitor is demonstrated with an outstanding capacitance retention of 90.3% over 2000 recycles. The impressive mechanical and electrochemical properties of covalently intercalated BC/GO composite may open new avenue in developing cross-linked GO nanocomposites for stretchable electronics. This is the first report on the preparation of covalent 15 intercalating BC/GO composite for robust supercapacitor application. Experimental 70Chemicals and materials. All starting materials and reagents were obtained from commercial sources and used without further purification unless otherwise noted. N, N'-dimethyl formamide (DMF) was distilled under vacuum prior to use. Distilled water was used for the preparation of the standard solutions for the 75 adsorption tests.Novel 3D cross-linked BC/GO composite has been prepared with a tensile strength of 18.48MPa and elongation at break of 24%. With an outstanding electrical conductivity of 171 S m -1 , the composite electrode exhibits a mass-specific capacitance of 160 F g -1 and a capacitance retention of 90.3% after 2000 cycling.

Three-Dimensional, Chemically Bonded Polypyrrole/Bacterial Cellulose/Graphene Composites for High-Performance Supercapacitors

“…Two typical bands (indexed at 1598, 1349 cm -1 ) are observed for PBG composites, which correspond to the welldocumented G and D bands of the hydrothermally reduced GO. 25 And the characteristics peaks of PPy (1051 and 963 cm -1 ) observed for PBG composites indicate the wrapping of PPy onto GO sheets and BC fibers. 32 High-resolution XPS spectra revealing the chemical bonding in PBG 10:1 composite is further shown in Figure 3.…”

Layer-by-Layer Assembled Bacterial Cellulose/Graphene Oxide Hydrogels with Extremely Enhanced Mechanical Properties

“…3 b). In the spectrum of BC, characteristic peaks (3348, 2892, 1429, and 1061 cm −1 due to –OH bonds, asymmetric stretching vibration of C–H, asymmetric angular deformation of C–H bonds, and antisymmetric bridge stretching of C–O–C, respectively [ 18 , 32 – 34 ]) are observed. In the spectrum of GO, three peaks, centered at 3361, 1730, and 1621 cm −1 , corresponding to the stretching vibrations of O–H, C=O, and C=C bonds [ 17 , 35 ], respectively, are observed.…”

“…The obtained nanocomposites show a tensile strength of 242 MPa in the dry state (5 wt% GO), which is an improvement of 22% compared to that of bare BC (198 MPa). Liu et al [ 18 ] prepared a BC/GO nanocomposite (in the dry state) with a tensile strength of 18.48 MPa by a one-step cross-linking method. In both cases, however, the obtained nanocomposites broke the intrinsically three-dimensional (3D) structure of the BC, which is the most precious feature distinguishing it from other natural polymers.…”

In vivo and in vitro efficient textile wastewater remediation by Aspergillus niger biosorbent

“…We can see that the intensity of oxygen-containing groups in the composite fungus/GO aerogels decreased, especially the peak at 1740 cm À1 , indicating that the hydroxyl groups in the polysaccharides of fungus reacted with epoxy groups and formed rGO. 37,38 During the cross-linking process between them, the functional groups changed and electron transfer occurred, which is benecial for the biosorption of the dyes. Moreover, the GO sheet of the composite aerogel provided more surface area compared with the fungus aerogel.…”