Fabrication of CuO-decorated reduced graphene oxide nanosheets for supercapacitor applications

Bu, Ian Y.Y.; Huang, Ray

doi:10.1016/j.ceramint.2016.08.136

Cited by 120 publications

(33 citation statements)

References 35 publications

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“…3 One of the best approaches to meet the power demand is to fabricate advanced nanomaterials with tunable nanopores and nanocavities due to its high specific surface area, excellent physicochemical properties, and improved supercapacitor performance. [4][5][6] The choice of supercapacitor material is mainly works based on the charge-storage mechanism, such as electrical double-layer capacitance (EDLC) and pseudocapacitance. Generally, carbon-based materials are utilized for EDLC, 7 and metal oxides/conducting polymers composite materials 8 are pseudo capacitance materials that perform by fast Faradaic redox reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

et al. 2020

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We demonstrate a simple template-free green method to prepare copper oxide (CuO) nanoporous material using copper acetate as a single precursor with Piper nigrum (Indian black pepper) dried fruit extract as a reducing medium under microwave irradiation. The surface properties and morphology of the obtained CuO material were assessed using powder X-ray diffractometer, X-ray photoelectron spectrometer, field-emission scanning electron microscope with elemental mapping analysis, focused ion beam high-resolution transmission electron microscope, and N 2 adsorption-isotherm techniques. The characterization results reveal that the prepared CuO is a single monoclinic crystalline phase, and nanoporous in morphology with a specific surface area of 81.23 m 2 g −1 and containing pore sizes between 3-8 nm. Nanoporous CuO showed excellent electrochemical energy storage performance with the specific capacitance of 238 Fg −1 at 5 mVs −1 when compared with commercially available CuO (75 Fg −1). Also, nanoporous CuO showed efficient desalting performance in the capacitive deionization system. This eco-friendly synthesis derived nanoporous CuO can be applied as high-performance supercapacitor material for high-energy storage devices and desalination processes.

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Section: Introductionmentioning

confidence: 99%

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

et al. 2020

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“…The CV curves of CuO/SiO 2 :rGO (1:3) nanocomposite are nearly rectangular which clearly indicates that the specific capacitance is dominated by EDLC and less of that of pseudocapacitance (Fig. 9); whereas for CuO, the specific (8) capacitance is attributed to the pseudocapacitive behaviour [16,33]. CV curves of CuO nanostructures show two cathodic peaks (positive current) around + 0.34 V at a scan rate of 100 mV, where the maximum flow of electrons is observed and reduction of Cu + /Cu takes place at + 0.52 V. Beyond this point, the current associated with the reduction decreases due to the slower diffusion of CuO than reduction.…”

Section: Electrochemical Studiesmentioning

confidence: 97%

“…To further improve the performance of the supercapacitor, CuO/SiO 2 is made as composite with grapheme and offers better performance benefitting from both electric double layer capacitance (EDLC) and pseudocapacitance mechanisms. In addition, incorporation of CuO/SiO 2 into graphene layers improves the electrode-electrolyte accessibility and also prevents agglomeration/restacking of graphene layers [6,16,17].…”

Section: Introductionmentioning

confidence: 99%

CuO/SiO2 modified amine functionalized reduced graphene oxide with enhanced photocatalytic and electrochemical properties

et al. 2018

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Graphene, an ideal two dimensional material, has attracted much attention due to its unique structural and physicochemical properties. Herein, we report synthesis of CuO/SiO 2 modified amine functionalized reduced graphene oxide (rGO) and its excellent potentialities in environmental remediation and energy storage application. The structure, purity, functional groups and morphology of as-prepared CuO/SiO 2 :rGO nanocomposites were characterized by XRD, FTIR, FESEM and TEM. The catalytic activity of the CuO/SiO 2 :rGO in different ratios was evaluated by degradation of methylene blue (MB) under visible light condition. The CuO/SiO 2 :rGO (mass ratio 1:3) exhibits high catalytic activity with 99% degradation of 20 ppm MB in 7 min. CuO/SiO 2 :rGO nanocomposites (1:3) also demonstrate good electrochemical performance with specific capacitance of 235 F g −1 , which is about fivefold higher than CuO nanoparticles. The nanocomposite (1:3) also reveals excellent cycling stability at 4 A g −1 for 1000 cycles and the capacitance retention was found to be 95% after 1000 cycles. These results validate that the development of a new class of composite necessitates the proper loading of metal oxide and GO to be used for energy and environmental applications.

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“…Among several transition metal oxides, ZnO and CuO have exhibited a potential for supercapacitor applications . Both CuO and ZnO have an inherent pseudocapacitive property.…”

Section: Introductionmentioning

confidence: 99%

Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites

2019

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Summary Nanocomposites of ZnO/CuO with rGO were synthesized using sonochemical and thermal treatment methods. The formation of ZnO and CuO phases on the rGO sheets and both ZnO/CuO in the ternary component nanocomposites were confirmed from IR spectroscopy and X‐ray photoelectron spectroscopy. The microstructure of the nanocomposites as revealed by TEM and FE‐SEM suggested that CuO was decorated as nano‐rods, whereas ZnO particles retained the spherical shape. In case of ternary nanocomposite, both nano‐rods and spherical particles were agglomerated on the rGO sheets. The pseudocapacitive behavior of ZnO‐rGO nanocomposite corresponded to relatively higher specific capacitance (344.6 F/g) compared with other nanocomposites. The galvanostatic cyclic charge/discharge (GCD) tests also confirmed that ZnO‐rGO nanocomposite could provide the highest specific energy (21.7 Wh/kg) and power density (129.8 kW/kg) at 0.4 A/g compared with CuO‐rGO and ZnO/CuO‐rGO.

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Fabrication of CuO-decorated reduced graphene oxide nanosheets for supercapacitor applications

Cited by 120 publications

References 35 publications

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

CuO/SiO2 modified amine functionalized reduced graphene oxide with enhanced photocatalytic and electrochemical properties

Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites

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