Green reduction of graphene oxide as a substitute of acidic reducing agents for supercapacitor applications

Joshi, Rita; Adhikari, Amrita De; Dey, Arjun; Lahiri, Indranil

doi:10.1016/j.mseb.2022.116128

Cited by 33 publications

(6 citation statements)

References 62 publications

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“…As GO is neither exfoliated nor reduced, the BET surface area obtained is low. It is to be noted, the process parameters also affect the BET surface area significantly 30 . The similar results are also reported in the literature 31–34 .…”

Section: Resultssupporting

confidence: 86%

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Functionalization of graphene oxide with an ionic liquid (1‐butyl‐3‐methylimidazolium acetate): Preparation of epoxy‐based coating on carbon steel for anticorrosive applications

Dhongde

Baranwal

Rajaraman

2023

J of Applied Polymer Sci

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An anticorrosive organic coating of epoxy on carbon steel (CS) was modified with uniformly dispersed graphene oxide (GO) after functionalization with ionic liquid (FGO). The ionic liquid (IL) used was 1‐butyl‐3‐methylimidazolium acetate which possess higher solubility and the graphene oxide was prepared by improved Hummer's method. The successful grafting of IL on the GO was confirmed by various techniques including Fourier‐transform infrared spectroscopy, Raman, XPS, x‐ray diffraction, thermogravimetric analysis, BET, field emission scanning electron microscope, and fidle emission transmission electron microscope. The surface characterization studies revealed that uniform dispersion of FGO is achieved in the epoxy matrix. Further, electrochemical studies such as potentiodynamic polarization, and electrochemical impedance spectroscopy showed higher corrosion protection efficiency (~99%) against corrosive fluid (3.5 wt% NaCl solution). This approach may offer an easy, ecologically benign way to create a new candidate coating for the protection of CS.

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Section: Resultssupporting

confidence: 86%

“…It is to be noted, the process parameters also affect the BET surface area significantly. 30 The similar results are also reported in the literature. [31][32][33][34] In addition, a 25.66% increment in BET surface area was observed after the functionalization of GO, indicating IL was successfully loaded on the GO nanosheet.…”

Section: Go Fgosupporting

confidence: 86%

Functionalization of graphene oxide with an ionic liquid (1‐butyl‐3‐methylimidazolium acetate): Preparation of epoxy‐based coating on carbon steel for anticorrosive applications

Dhongde

Baranwal

Rajaraman

2023

J of Applied Polymer Sci

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“…Some variation in capacitance is expected due to differing degrees of oxidation/reduction of the GO/RGO structures (Figure 1a,b) that result in disproportional conductive, nonconductive, and oxygenated or other heteroatom functionalized graphene sp 2 /sp 3 carbon components, and accessible porosity of the graphenic framework for facilitating charge storage and its dynamics. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][44][45][46][47][48][49][50][51][52][53] Other factors (Figure 1c; Table S1, Supporting Information) that can affect the overall capacitance performance include electrode preparation routes resulting in different mass-loadings and thicknesses (ultra-low mass loadings or ultrathin layers of active materials often show high capacities over thicker counterparts due to enhanced charge and mass transfer). [53,…”

Section: Introductionmentioning

confidence: 99%

Understanding and Optimizing Capacitance Performance in Reduced Graphene‐Oxide Based Supercapacitors

Gadipelli

Guo

et al. 2023

Small Methods

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Reduced graphene-oxide (RGO)-based electrodes in supercapacitors deliver high energy/power capacities compared to typical nanoporous carbon materials. However, extensive critical analysis of literature reveals enormous discrepancies (up to 250 F g −1 ) in the reported capacitance (variation of 100-350 F g −1 ) of RGO materials synthesized under seemingly similar methods, inhibiting an understanding of capacitance variation. Here, the key factors that control the capacitance performance of RGO electrodes are demonstrated by analyzing and optimizing various types of commonly applied electrode fabrication methods. Beyond usual data acquisition parameters and oxidation/reduction properties of RGO, a substantial difference of more than 100% in capacitance values (with change from 190 ± 20 to 340 ± 10 F g −1 ) is found depending on the electrode preparation method. For this demonstration, ≈40 RGO-based electrodes are fabricated from numerous distinctly different RGO materials via typically applied methods of solution (aqueous and organic) casting and compressed powders. The influence of data acquisition conditions and capacitance estimation practices are also discussed. Furthermore, by optimizing electrode processing method, a direct surface area governed capacitance relationship for RGO structures is revealed.

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“…Green-synthesized graphene can be used in supercapacitors by directly using it as an electrode material [ 41 , 42 , 43 ] or by incorporating it into composites with other materials [ 44 , 45 ] to enhance electrode performance. The high electrical conductivity and large surface area of GNSs enable efficient charge storage and fast charge/discharge rates, leading to improved supercapacitor performance.…”

Section: Introductionmentioning

confidence: 99%

Use of Few-Layer Graphene Synthesized under Conditions of Self-Propagating High-Temperature Synthesis for Supercapacitors Applications

Vozniakovskii,

Smirnova,

Apraksin

et al. 2023

Nanomaterials

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Graphene nanostructures (GNSs) are among the most promising materials for producing supercapacitors. However, GNSs are still not used in creating supercapacitors due to the impossibility of obtaining large volumes of high-quality material at an acceptable cost. In our previous works, we have shown the possibility of synthesizing large volumes of few-layer graphene (FLG, the number of layers is not more than five) from cyclic biopolymers under conditions of self-propagating high-temperature synthesis (SHS). Using the SHS process makes it possible to synthesize large volumes of FLG without Stone–Wales defects. This work is devoted to the study of the possibility of using FLG synthesized under the conditions of the SHS process in the creation of supercapacitors. It was found that the synthesized FLG makes it possible to obtain better results than using classical materials, namely activated carbon (AC). It was found that the sample based on FLG had a higher specific capacitance of 65 F × g−1 compared to the sample from AC, the specific capacitance of which was 35 F × g−1; for a speed of 5 mV × s−1, these values were170 and 64 F × g−1, respectively. The drop in capacitance over 1000 cycles was 4%, indicating a sufficiently high FLG stability, allowing us to consider FLG as a prospective material for use in supercapacitors.

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Green reduction of graphene oxide as a substitute of acidic reducing agents for supercapacitor applications

Cited by 33 publications

References 62 publications

Functionalization of graphene oxide with an ionic liquid (1‐butyl‐3‐methylimidazolium acetate): Preparation of epoxy‐based coating on carbon steel for anticorrosive applications

Functionalization of graphene oxide with an ionic liquid (1‐butyl‐3‐methylimidazolium acetate): Preparation of epoxy‐based coating on carbon steel for anticorrosive applications

Understanding and Optimizing Capacitance Performance in Reduced Graphene‐Oxide Based Supercapacitors

Use of Few-Layer Graphene Synthesized under Conditions of Self-Propagating High-Temperature Synthesis for Supercapacitors Applications

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