Facile Synthesis and Characterization of Reduced Graphene Oxide Produced with Green and Conventional Reductants

Abstract

In this work, we report a facile and green reduction method to synthesize reduced graphene oxide (rGO) sheet by using epigallocatechin gallate (EGCG) and hydroiodic acid (HI) simultaneously as a reduction agents and investigate its efficiency as an electrode. Two steps reduction and modification of graphene oxide GO with epigallocatechin gallate (EGCG) as a green reductant and hydroiodic acid (HI) as strong chemical reducing agent are investigated in this work. The indication of the reduction efficiency of rGO surface was determined by scanning electron microscopy (SEM). The results showed that using both of the reductants simultaneously was effective for removing oxygen-containing functional groups in GO to obtain rGO. The rGO obtained from these two-step processes had C/O ratio of about ∼10.26 and conductivity of 2385 S/m. The results also show that the presence of EGCG in the final rGo sheet provides active sites for furthered modification of rGO such as decorating it with metal nanoparticles in a single-step chemical deposition. These features will facilitate its further use as a flexible electrode in composite materials of conductors and many other applications.

A New Graphitic Nitride and Reduced Graphene Oxide-Based Sulfur Cathode for High-Capacity Lithium-Sulfur Cells

“…Moreover, urea is believed to promote the exfoliation of graphene oxide (GO) sheets through hydrogen bonding between the polar groups present in the central area of the graphene sheet and urea. Based on our previous study involving GN [65], we tried to limit the loading of GN between 10 and 15 wt. %, a condition to achieve both good conductivity and superior polysulfide absorbing characteristics of the composite cathode.…”

“…This peak represents the formation of both higher-order polysulfides (viz. Li 2 S 8 ) and then elemental sulfur through the oxidation of lower-order LiPSs [65,70,71]. Electrochemical impedance spectroscopy was utilized to assess the diffusion rate of Li + and the electronic conductivity of the cathode material (Figure 4b).…”

“…Energies 2022, 15, x FOR PEER REVIEW 7 of 12 lower-order LiPSs [65,70,71]. Electrochemical impedance spectroscopy was utilized to assess the diffusion rate of Li + and the electronic conductivity of the cathode material (Figure 4b).…”

“…Comparison between the performance of S@RGO/GN and other cathode nanocomposites that utilized g-C 3 N 4 in their structure[56][57][58][59]65].…”

Observation of critical magnetic behavior in 2D carbon based composites

“…In the chemical reduction process, reducing agents like sodium hydroxide (NaOH), sodium borohydride (NaBH 4 ), hydrazine monohydrate (NH 2 NH 2 $H 2 O), hydroxylamine (NH 2 OH), hydroquinone (C 6 H 6 O 2 ), phenylenediamine (C 6 H 8 N 2 ) and hydrohalic acid (HX where X ¼ uorine, chlorine, bromine) are used to expel the oxygen functionalities. 28,29 Table 2 shows the magnetic behavior of some RGO materials.…”