Role and effect of electrolytes selection on supercapacitance behaviour of aminated graphenes

Saha, Uttam Kumar; Jaiswal, Rimpa; Goswami, Thako Hari; Maji, Pardip K

doi:10.1016/j.electacta.2022.141400

Cited by 8 publications

(38 citation statements)

References 43 publications

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“…In the specified potential window range (from 0 to 1.2 V) with sweep of scan rates, the peak current gradually shifted toward higher positive and negative potential areas of the present electrode materials as represented in electrolytes. 18,19,[21][22][23][24][25]29,32,34 Importantly, the quasi-rectangular shape of each CV curve is still well maintained even at a higher scan rate, indicating that the material possesses excellent rate capability and reversibility. 18,19,[21][22][23][24][25]29,32,34 Further, a flat round shape redox peak signal is also associated with all of the present composite materials from their respective cyclic voltammogram plots in both electrolytes, confirming the major EDLC combined with pseudocapacitance behaviors present in the current composite compounds (Figure 5).…”

Section: ■ Experimental Sectionsmentioning

confidence: 99%

“…18,19,[21][22][23][24][25]29,32,34 Importantly, the quasi-rectangular shape of each CV curve is still well maintained even at a higher scan rate, indicating that the material possesses excellent rate capability and reversibility. 18,19,[21][22][23][24][25]29,32,34 Further, a flat round shape redox peak signal is also associated with all of the present composite materials from their respective cyclic voltammogram plots in both electrolytes, confirming the major EDLC combined with pseudocapacitance behaviors present in the current composite compounds (Figure 5). 18,19,[21][22][23][24][25]29,32,34,62 Furthermore, the specific capacitance values of all three compounds were calculated from the CV curves using eq 1, 18,19,29,32,34 and the values are given in Table S4 (Supporting Information).…”

Section: ■ Experimental Sectionsmentioning

confidence: 99%

“…Such wellknown decreasing tendency of the specific capacitance values may lead to insufficient accessibility of electroactive sites during the charge−discharge process at higher current densities. 18,19,21−25,29,32,34,62−64 Furthermore, the Coulombic efficiency (CE) can be obtained from the charge−discharge curve using the following eq 3 29,32,34 :…”

Section: ■ Experimental Sectionsmentioning

confidence: 99%

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Investigation of the Role of 3d-4d Elements in a Disordered Double Perovskite toward Efficient Photocatalytic Energy Conversion and Electrochemical Energy-Storage Behaviors

Saha,

Rom,

Sakla

et al. 2024

ACS Appl. Energy Mater.

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Toward the goal of achieving green and sustainable energy conversion and storage behaviors, double perovskite oxide materials are always pronounced not only due to their exciting properties but also for their advanced catalytic and electroactive nature. In order to understand the factual role of either 3d or 4d metal ions in double perovskites toward energy conversion and storage applications, herein we have demonstrated three ruthenium-based disordered double perovskites, namely, Ca 2 MnRuO 6 (CMRO), Ca 2 Mn 1.25 Ru 0.75 O 6 (CMRO-1), and Ca 2 Mn 0.75 Ru 1.25 O 6 (CMRO-2), by varying the Mn/Ru stoichiometry. The well-characterized phase-pure polycrystalline oxides are employed as efficient photocatalysts for visible light-driven water oxidation in a neutral pH medium. Even a small quantity of the present catalyst can evolve larger amounts of oxygen compared to reported photocatalysts. Furthermore, electrochemical supercapacitor performance has been accomplished by the CMRO compounds and reduced graphene oxide (rGO) composite electrodes. The electrochemical measurement reveals that the as-fabricated CMRO-2 oxide-rGO composite electrode possesses much higher capacitance of 598.8 F/g at a scan rate of 2 mV/s in 0.5 M H 3 PO 4 electrolyte solution compared to 0.5 M H 2 SO 4 common electrolyte medium. Remarkably, the CMRO-2 and rGO composite electrode exhibited a maximum energy density of 431.1 Wh/kg at a power density of 14.4 W/kg in 0.5 M H 3 PO 4 electrolyte. Notably, the slight variation of Mn/Ru concentration in title perovskite structures commendably affects the photocatalytic water oxidation and electrochemical supercapacitor performances. Such exciting structure−activity phenomena of 3d-4d transition metal-based oxide materials are also validated through density functional theory calculations.

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Section: ■ Experimental Sectionsmentioning

confidence: 99%

Section: ■ Experimental Sectionsmentioning

confidence: 99%

Section: ■ Experimental Sectionsmentioning

confidence: 99%

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Investigation of the Role of 3d-4d Elements in a Disordered Double Perovskite toward Efficient Photocatalytic Energy Conversion and Electrochemical Energy-Storage Behaviors

Saha,

Rom,

Sakla

et al. 2024

ACS Appl. Energy Mater.

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“…The selection of the electrolyte is of crucial importance in this process. Therefore, there have been numerous reports in the literature on both experiments with the use of aqueous and nonaqueous electrolytes [ 30 ]. The advantage of nonaqueous solutions is their wide electrochemical windows, which allow for a more stable process.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Electrochemical Method of Obtaining Graphene Nanoplatelets (GNPs)

et al. 2023

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Graphene nanoplatelets (GNPs) were prepared using the electrolytic exfoliation method on graphite foil in an ammonium sulfate solution. A series of experiments were conducted in order to optimize the production of the flakes by varying the pH of the solution, applied voltage and current, duration of electrolysis, temperature in the electrolytic system, and type and duration of the ultrasound interaction. The quality of the produced graphene nanoplatelets was analyzed using X-ray diffraction, Raman and IR spectroscopy, and TEM.

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“…Secondary agglomeration during curing must be avoided which arises during the mixing. [ 26 ] These problems can be amicably solved through chemical functionalization of graphene and thus, improved electrochemical property [ 27 ] can be achieved. Most importantly, easy dispersion of chemically modified graphene (CMG) can be achieved in large variety of solvents depending on the types of functional groups attached on the graphene surface (S1 in Data S1).…”

Section: Introductionmentioning

confidence: 99%

Effect of partially reduced fullerenol‐graphene hybrid nanofiller on photophysical and super capacitance properties of fluorescence conducting polymer nanocomposites

et al. 2023

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The effect of partially reduced fullerenol-graphene oxide (rFGO) nanofiller on photophysical and super capacitance properties of binary nanocomposites containing phenylene-alt-thiophene fluorescence conducting polymer (FCP) were investigated. Nanocomposites were prepared by solution mixing, which allows uniform nanofiller distribution into the polymer matrix. Microscopic analyses of nanocomposites display homogeneous dispersion of nanofiller into the polymer matrix. Quenching of photoluminescence reveals the photosensitized electron transfer from light-absorbing FCP (acting as an electron donor) to fullerenol-graphene nanofiller (acting as an electron acceptor). The presence of partially reduced graphene sheets in rFGO nanofiller facilitates the photosensitized electron transfer along the surface and also through the interlayer channels of graphene sheets due to the pillar effect of fullerenol. UV-vis and photoluminescence spectroscopic characterization data reveal excellent interaction between filler and matrix, responsible for electron transfer mechanism. Super capacitance properties of binary nanocomposites in three different electrolytes (acid, neutral and alkaline) were also investigated and the best galvanic charge discharge result of 173 F/g at 2 A/g current density was obtained at 2 wt% loading up to 500th cycle for rFGO in acid electrolyte only. The material was ineffective in the alkaline electrolyte and showed poor results in neutral electrolyte. An attempt has been made to evaluate the structure-property relationship of nanocomposites from their thermal, photophysical, and electrochemical properties.

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Role and effect of electrolytes selection on supercapacitance behaviour of aminated graphenes

Cited by 8 publications

References 43 publications

Investigation of the Role of 3d-4d Elements in a Disordered Double Perovskite toward Efficient Photocatalytic Energy Conversion and Electrochemical Energy-Storage Behaviors

Investigation of the Role of 3d-4d Elements in a Disordered Double Perovskite toward Efficient Photocatalytic Energy Conversion and Electrochemical Energy-Storage Behaviors

Optimization of the Electrochemical Method of Obtaining Graphene Nanoplatelets (GNPs)

Effect of partially reduced fullerenol‐graphene hybrid nanofiller on photophysical and super capacitance properties of fluorescence conducting polymer nanocomposites

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