Rational design and electrochemical validation of reduced graphene oxide (rGO) supported CeO2-Nd2O3/rGO ternary nanocomposite as an efficient material for supercapacitor electrodes
“…The interaction between graphene oxide and cerium oxide under this synthesis condition could promote the growth of cerium oxide particles. Because utilized synthesis conditions of the graphene oxide lead to agglomeration or clustering of particles, it might give the appearance of larger particle sizes 47 . The increased crystallite size enhances the overall surface area and catalytic activity of the nanocomposites, making them more effective in various applications, such as catalysis and antibacterial.…”
This work focuses on the structural, morphological, optical, photocatalytic, antibacterial properties of pure CeO2 nanoparticles (NPs) and graphene oxide (GO) based CeO2 nanocomposites (GO-1/CeO2, GO-5/CeO2, GO-10/CeO2, GO-15/CeO2), synthesized using the sol–gel auto-combustion and subsequent sonication method, respectively. The single-phase cubic structure of CeO2 NPs was confirmed by Rietveld refined XRD, HRTEM, FTIR and Raman spectroscopy. The average crystallite size was calculated using Debye Scherrer formula and found to increase from 20 to 25 nm for CeO2 to GO-15/CeO2 samples, respectively. The related functional groups were observed from Fourier transform infrared (FTIR) spectroscopy, consistent with the outcomes of Raman spectroscopy. The optical band gap of each sample was calculated by using a Tauc plot, which was observed to decrease from 2.8 to 1.68 eV. The valence state of Ce (Ce3+ and Ce4+) was verified using X-ray photoelectron spectroscopy (XPS) for CeO2 and GO-10/CeO2. The poisonous methylene blue (MB) dye was used to evaluate the photocatalytic activity of each sample in direct sunlight. The GO-15/CeO2 nanocomposite showed the highest photocatalytic activity with rate constant (0.01633 min–1), and it degraded the MB dye molecules by 100% within 120 min. The high photocatalytic activity of this material for degrading MB dye establishes it as an outstanding candidate for wastewater treatment. Further, these nanocomposites also demonstrated excellent antimicrobial activity against Pseudomonas aeruginosa PAO1.
“…The interaction between graphene oxide and cerium oxide under this synthesis condition could promote the growth of cerium oxide particles. Because utilized synthesis conditions of the graphene oxide lead to agglomeration or clustering of particles, it might give the appearance of larger particle sizes 47 . The increased crystallite size enhances the overall surface area and catalytic activity of the nanocomposites, making them more effective in various applications, such as catalysis and antibacterial.…”
This work focuses on the structural, morphological, optical, photocatalytic, antibacterial properties of pure CeO2 nanoparticles (NPs) and graphene oxide (GO) based CeO2 nanocomposites (GO-1/CeO2, GO-5/CeO2, GO-10/CeO2, GO-15/CeO2), synthesized using the sol–gel auto-combustion and subsequent sonication method, respectively. The single-phase cubic structure of CeO2 NPs was confirmed by Rietveld refined XRD, HRTEM, FTIR and Raman spectroscopy. The average crystallite size was calculated using Debye Scherrer formula and found to increase from 20 to 25 nm for CeO2 to GO-15/CeO2 samples, respectively. The related functional groups were observed from Fourier transform infrared (FTIR) spectroscopy, consistent with the outcomes of Raman spectroscopy. The optical band gap of each sample was calculated by using a Tauc plot, which was observed to decrease from 2.8 to 1.68 eV. The valence state of Ce (Ce3+ and Ce4+) was verified using X-ray photoelectron spectroscopy (XPS) for CeO2 and GO-10/CeO2. The poisonous methylene blue (MB) dye was used to evaluate the photocatalytic activity of each sample in direct sunlight. The GO-15/CeO2 nanocomposite showed the highest photocatalytic activity with rate constant (0.01633 min–1), and it degraded the MB dye molecules by 100% within 120 min. The high photocatalytic activity of this material for degrading MB dye establishes it as an outstanding candidate for wastewater treatment. Further, these nanocomposites also demonstrated excellent antimicrobial activity against Pseudomonas aeruginosa PAO1.
“…It is obvious that ZnSe-XrGO has comparatively high photocatalytic activities than ZnSe. The reason is that the reduced graphene oxide (rGO) in the nanocomposite has increased the mobility of photo-generated charges [ 35 ], retarded electron-hole pair recombination resulting in high electron density and provide high surface area for interaction with dye [ 27 , 54 , 55 ], Fig. 6 UV-VIS adsorption spectral changes of 10 ppm MV solution as a function of time over (a) ZG1 (b) ZG2 (c) ZG3 under Visible light irradiation.…”
“…Supercapacitors have increased capacitance (F g −1 , F cm −2 ) because their electrodes have a large surface area 6–11 . Conducting polymers, metal oxides, and metal sulfides are acting as the supercapacitor materials 12–15 . The current major problem in the development of pseudocapacitor is to increase their energy density while maintaining their high‐power capability and long cycle life.…”
Section: Introductionmentioning
confidence: 99%
“…[6][7][8][9][10][11] Conducting polymers, metal oxides, and metal sulfides are acting as the supercapacitor materials. [12][13][14][15] The current major problem in the development of pseudocapacitor is to increase their energy density while maintaining their high-power capability and long cycle life. To achieve this goal, recent advancements focused on several electrode materials, particularly metal oxides, metal sulfides, and conducting polymers.…”
Poly (3‐methylthiophene) (P3MT) was modified by nickel oxide (NiO) and nickel sulfide (NiS) nanoparticles to enhance its electrochemical performance. The surface influence, crystalline structure, and electrochemical performance of the P3MT/NiO/NiS material were characterized and compared with that of pristine P3MT. It is found that surface modification can improve the structural stability of P3MT without decreasing its available specific capacitance. The electrochemical properties of synthesized P3MT/NiO/NiS electrode were evaluated using cyclic voltammetry and alternating current impedance techniques in 3 M KOH electrolyte. Specific capacitances of 253, 764, 932, and 1434 F g−1 were obtained for P3MT, P3MT/NiO, P3MT/NiS, and P3MT/NiO/NiS, respectively at 5 A g−1. This improvement is attributed to the synergistic effect of Ni2+ ions in the P3MT/NiO/NiS electrode material. The P3MT/NiO/NiS electrode in KOH has average specific energy and specific power densities of 1032 Wh kg−1 and 6192 W/kg, respectively. Only 2% of the capacitance's initial value is lost after 10,000 cycles. The resulting P3MT/NiO/NiS nanocomposite had very stable and porous layered structures. This work demonstrates that P3MT/NiO/NiS nanomaterials exhibit good structural stability and electrochemical performance, and are good material for supercapacitor applications.Highlights
The P3MT/NiO/NiS nanocomposite is fabricated and characterized as supercapacitor electrode.
The incorporation of NiO/NiS in the poly (3‐methylthiophene) has improved the electrochemical performance.
The P3MT/NiO/NiS electrodes retained 98% of their specific capacitance after 10,000 cycles.
The P3MT/NiO/NiS nanocomposite electrode showed specific capacitance of 1434 F g−1 at 5 A g−1.
The stability of the nanocomposite was enhanced without altering its morphology and chemical structure.
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