Effect of Graphene Oxide on the Properties of Its Composite with Polyaniline

Abstract

Graphene oxide, a single layer of graphite oxide (GO), has been used to prepare graphene oxide/polyaniline (PANI) composite with improved electrochemical performance as supercapacitor electrode by in situ polymerization using a mild oxidant. The composites are synthesized under different mass ratios, using graphite as start material with two sizes: 12 500 and 500 mesh. The result shows that the morphology of the prepared composites is influenced dramatically by the different mass ratios. The composites are proposed to be combined through electrostatic interaction (doping process), hydrogen bonding, and pi-pi stacking interaction. The highest initial specific capacitances of 746 F g(-1) (12 500 mesh) and 627 F g(-1) (500 mesh) corresponding to the mass ratios 1:200 and 1:50 (graphene oxide/aniline) are obtained, compared to PANI of 216 F g(-1) at 200 mA g(-1) by charge-discharge analysis between 0.0 and 0.4 V. The improved capacitance retention of 73% (12 500 mesh) and 64% (500 mesh) after 500 cycles is obtained for the mass ratios 1:23 and 1:19 compared to PANI of 20%. The enhanced specific capacitance and cycling life implies a synergistic effect between two components. This study is of significance for developing new doped PANI materials for supercapacitors.

Poly(vinyl alcohol)/graphene oxide nanocomposites prepared by a simple eco-process

“…The peak at 528.5 eV can be related to carboxyl/carbonyl/ether groups (peak 2), and the peak at 536.0 eV can be related to a nepoxy group (peak 3). 41 Judging from the results of XPS and those of the Fouriertransferred infrared (Figure 1a), the surface of GO was oxidized adequately, which resulted in the nanodispersion of GO in an aqueous medium. Figure 2 shows the X-ray diffraction profiles of the PVA film, PVA/ GO nanocomposites and GO powder dried from aqueous medium.…”

“…The peaks at 289.1 eV (peak 1) and 289.9 eV (peak 2) can be assigned as carbonyl groups and carboxyl groups, respectively. 40,41 The peak for the C-O-C bond in epoxies/ethers as well as that for C-OH bonding were found at the binding energy of 287.5 eV (peak 3). 42 The peaks related to the graphene components appeared at 284.5 eV (sp 3 carbons and alkyl groups) (peak 4) and 283.7 eV (graphitic sp 2 carbon species) (peak 5).…”

Electrosynthesis and Electrochemical Properties of Metal Oxide Nano Wire/ P-type Conductive Polymer Composite Film

“…As shown in Fig. 3(b), a redox peak in potentials between 0.5 -0.6 V were appeared that is attributed to PANI transition from emeraldine to pernigraniline form [30]. Specific capacitance (SC) of electrodes calculated from cyclic voltammogram curves according to following equation:…”

In-situ Polymerization of Carboxyl-functionalized Graphene Oxide and Polyaniline Composites for Supercapacitor

“…In the functionalization of GO, carboxyl groups can be used to further introduce the active groups of biomolecules, macromolecules and small molecules into graphene. It is found that, carboxyl is mainly in GO layer flat edge position [4], and the epoxy groups and hydroxyl mainly exist in the graphene oxide layer plane, most of the preparation of graphene/ polyaniline (PANI) composites [5][6][7] ignore the -OH and -O-in the plane, and just use the carboxyl in the edge of the lamella, this may cause PANI to move around the graphene sheet and result in incomplete and unstable composition. Adoption of a certain functional approach to the epoxy and hydroxyl groups in the plane of GO into carboxyl, then compositing with PANI, can make the PANI conductive polymers order and stable in the graphene surface.…”