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Journal ArticleDOI: 10.1016/J.JALLCOM.2020.157463

Investigation of a novel (GO@CuO.γ-Al2O3) hybrid nanocomposite for solar energy applications

05 Mar 2021-Journal of Alloys and Compounds (Elsevier)-Vol. 856, pp 157463
Abstract: A novel hybrid nanomaterial (HNM) (GO@CuO.γ-Al2O3) was manufactured where the thermal and electrical performances were comprehensively appraised investigated. The combination nanomaterial (NM) was achieved through the loading of Graphene oxide nanosheet (GO) with other NMs quantum dots (QDs); namely: Copper oxide (CuO) nanorod, and Aluminum oxide (γ-Al2O3) nanoparticles (NPs). X-ray diffraction (XRD), transmission electron microscopy (TEM), Scanning electron microscopy (SEM), and Zeta potential were employed to characterize properties of the fabricated nanomaterials. The results confirmed the formation and loading of NM QDs successfully on the GO surface. Different nanofluids were prepared from mono NMs (GO, CuO, and γ-Al2O3), and hybrid NMs (GO@CuO, GO@γ-Al2O3, and GO@CuO. γ-Al2O3) with water as base fluid, aiming to evaluate the thermal conductivity. Different concentrations of the nanofluids (0.0625, 0.125, and 0.2%) were investigated within a temperature range of 20–50 °C. For (GO@CuO.γ-Al2O3), compared to water, maximum enhancement in thermal conductivity (22.56%) was achieved with 0.2% concentration and 50 °C. These results indicate that GO@CuO.γ-Al2O3 as nanofluid is very favorable for solar collector heaters. The current-voltage (I–V) and photoluminescence (PL) measurements were performed to investigate photocurrent generation and the electron-hole pair recombination. The results showed that GO@CuO nanocomposite has more ability to produce photocurrent rather than the other nanocomposites, where the current of GO@CuO nanocomposites is higher than GO@Al2O3·CuO nanocomposite. GO@CuO nanocomposite has the lowest PL intensity, which shows lower charge carrier recombination and higher light harvesting. The I–V and PL results indicate that GO@CuO nanocomposite is a gifted material for solar cell applications. Consequently, GO@Al2O3·CuO and GO@CuO nanocomposites are very promising candidates with higher performance for solar energy applications.

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Topics: Nanocomposite (55%), Nanomaterials (53%), Nanorod (52%) ... read more
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17 results found


Journal ArticleDOI: 10.1016/J.SEPPUR.2021.118631
Abstract: Copper oxide/zinc oxide as a novel hybrid nanocomposite based on graphene oxide surface have been fabricated successfully to improve the photocurrent and electrochemical properties for copper oxide nanoparticles. Copper sulfate was dropped wised to a hot solution of potassium hydroxide to form copper oxide nanorod quantum dots followed by inserting it into a solution of graphene oxide to fabricate graphene oxide/copper oxide nanocomposite. Zinc oxide nanorods have been added to fabricate graphene oxide/copper oxide/zinc oxide hybrid nanocomposite. The fabricated nanomaterials have been characterized by various tools successfully and the optoelectronic and electrochemical properties were investigated employing absorption, cyclic voltammetry, current-voltage, and photoluminescence measurements. The improving electrical properties and photosensitivity of fabricated graphene oxide/copper oxide/zinc oxide hybrid nanocomposite were observed and the results showed that it has higher efficiency for the degradation of organic pollution compared to copper oxide nanorod and graphene oxide/copper oxide nanocomposite. The results of current-voltage and photoluminescence measurements showed that graphene oxide/copper oxide/zinc oxide has the highest photocurrent and the lowest photoluminescence intensity which indicates the lowest recombination that confirmed the higher performance of the carrier charge separation. Moreover, the simulated efficiency of about 24% is obtained for graphene oxide/copper oxide/zinc oxide heterojunction. Therefore, these results indicate that graphene oxide/copper oxide/zinc oxide hybrid nanocomposite is very promising as a new candidate with higher efficiency for anti-fouling and solar cell applications.

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Topics: Copper oxide (76%), Oxide (71%), Graphene (59%) ... read more

7 Citations


Journal ArticleDOI: 10.1016/J.MTCOMM.2020.101986
Abstract: Investigation of thermophysical properties of reduced graphene oxide-Al2O3 (rGO-Al2O3) nanocomposite based nanofluid along with convective heat transfer study and associated pressure drop has been done in the present work. Formation of the rGO-Al2O3 nanocomposite was confirmed with the help of various characterization techniques like UV/Vis, XRD, FTIR, Raman spectroscopy, TEM, Elemental mapping and XPS analysis. Thermal conductivity at different temperatures of various volume % (0.01−0.1%) of the prepared rGO-Al2O3 nanofluid was measured by dispersing and ultrasonicating the nanocomposite in deionized water. Thermal conductivity increased with increase in temperature as well as concentration of the rGO-Al2O3 nanofluid. These nanofluids exhibited non-Newtonian behavior as found from their rheological study. Different viscosity models also were employed to predict the viscosity at a range of applied shear rate (0-2000 s−1). Convective heat transfer study at a wall condition of constant heat flux was done at different concentration and Reynolds number of the rGO-Al2O3 nanofluid. Maximum value of heat transfer coefficient of 5461.602 W/m2℃ was achieved at the exit of test section by using 0.05 vol.% rGO-Al2O3 nanofluid flowing at Reynolds number of 7510.

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Topics: Nanofluid (66%), Heat transfer coefficient (61%), Convective heat transfer (58%) ... read more

7 Citations


Journal ArticleDOI: 10.1016/J.EST.2021.102526
Abstract: In this piece of work, an attempt to solve the global energy crisis by presenting advanced thermal energy storage technology was experimentally investigated. To enhance the thermal performance of paraffin wax as phase change material (PCM), nanoparticles (NPs) were utilized at 3% wt. concentration in mono and hybrid form: copper oxide (CuO) NPs, cobalt oxide (Co3O4) NPs, and CuO@Co3O4 nanocomposite (NC). All the fabricated materials were detailly characterized via SEM, TEM, XRD, FT-IR, and DSC analyses. Beyond, outdoor experiments, under direct/indirect solar exposure, were conducted to determine the thermal performance of the nano-enhanced PCM specimens compared to pure PCM. For each experiment, direct/indirect solar absorption, four specimens were prepared: pure paraffin wax, nano-CuO-enhanced paraffin wax, nano-Co3O4-enhanced paraffin wax, and nano-CuO@Co3O4-enhanced paraffin wax. As result, all nano-based PCM cases had better performance than pure PCM. Among them, the nano-CuO@Co3O4-enhanced PCM recorded the highest temperature, at noon, with an enhancement ratio of 14.15% compared to that of pure paraffin wax.

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Topics: Paraffin wax (68%), Cobalt oxide (52%)

6 Citations


Journal ArticleDOI: 10.1016/J.COLSURFA.2021.127035
Abstract: In this work, carboxymethylcellulose (CMC) macrostructure has been incorporated with graphene oxide nanosheet (GO) to form a hybrid composite as a modified surface for antifouling membrane and supercapacitor applications. The hybrid nanomaterial (HNM) has been synthesized successfully and characterized via various tools, such as scanning electron microscopy (SEM), ultraviolet-visible spectroscopy (UV-Vis), and X-ray diffraction (XRD). A modified surface of Graphene oxide/ Cellulose (GO@CMC) has been studied by cyclic voltammetry technique for detecting the electrochemical properties, supercapacitor, and energy storage. Also, the optical properties of the modified antifouling surface of the HNM membrane were detected by UV-spectroscopy apparatus for water treatment applications. For proving the easily, the electron transfer of GO@CMC via the photocatalytic process for degradation of organic and inorganic pollutions, such as methylene blue (MB) dye. The cytotoxicity of fabricated HNM has been studied with two cell lines such as Breast Cancer cell line (MDA-MB-231) and the other was Hepatocellular carcinoma cell line (HepG2), the following results have been obtained: - A good electron transfer has been detected with GO@CMC HNM. - Easily the photocatalytic process with organic compounds pollution. - GO@CMC HNM has effects observably on the cell lines of MDA-MB-231 and HepG2. - Results demonstrated that the fabricated HNM is promising electrode material for supercapacitors application and energy storage.

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Topics: Nanosheet (53%), Graphene (51%)

5 Citations


Journal ArticleDOI: 10.1016/J.SOLENER.2021.06.085
A.W. Kandeal1, A.W. Kandeal2, Nagi M. El-Shafai1, Mohamed R. Abdo  +9 moreInstitutions (4)
01 Aug 2021-Solar Energy
Abstract: In this work, the performance of a modified double slope still (MDSSS) was evaluated compared to conventional single slope one (CSS). The modifications depended on different additives, namely: copper chips, copper oxide (CuO) nanoparticles/fluid, and paraffin wax as phase change material (PCM). First, the proposed materials were characterized to determine the thermophysical properties and the best ratios. As resulted, the copper chips, and nano-enhanced materials (water and PCM) had higher thermal conductivity than bulk water, and pure materials, respectively. Beyond the characterization, three cases of MDSSS were investigated compared to CSS: copper chips immersed in CuO/water nanofluid (1.5 wt%) (case I), integrating pure PCM container below the basin containing the previous materials (case II), and using nano-based PCM (15 wt%) instead of the pure PCM (case III). Moreover, the thermo-economic performance was evaluated by determining the efficiencies of the first and second laws of thermodynamics and the freshwater cost. As found, all cases showed good performance improvements, and case III was the best from both production and thermo-economic considerations. For this case, the productivity, energy efficiency, and exergy efficiency were enhanced by 113, 112.5, and 190%, respectively, relative to CSS. In addition, the freshwater production cost was saved by 35.3%.

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Topics: Copper oxide (51%), Nanofluid (51%)

3 Citations


References
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73 results found


Journal ArticleDOI: 10.1002/ADMA.201001068
Yanwu Zhu1, Shanthi Murali1, Weiwei Cai1, Xuesong Li1  +3 moreInstitutions (1)
15 Sep 2010-Advanced Materials
Abstract: There is intense interest in graphene in fields such as physics, chemistry, and materials science, among others. Interest in graphene's exceptional physical properties, chemical tunability, and potential for applications has generated thousands of publications and an accelerating pace of research, making review of such research timely. Here is an overview of the synthesis, properties, and applications of graphene and related materials (primarily, graphite oxide and its colloidal suspensions and materials made from them), from a materials science perspective.

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Topics: Graphene (58%), Graphite oxide (57%)

7,753 Citations


Journal ArticleDOI: 10.1002/ADFM.201501429
Jackie D. Renteria1, S. Ramirez1, Hoda Malekpour1, Beatriz Alonso  +7 moreInstitutions (2)
Abstract: Thermal conductivity of free-standing reduced graphene oxide films subjected to a high-temperature treatment of up to 1000 °C is investigated. It is found that the high-temperature annealing dramatically increases the in-plane thermal conductivity, K, of the films from ≈3 to ≈61 W m−1 K−1 at room temperature. The cross-plane thermal conductivity, K⊥, reveals an interesting opposite trend of decreasing to a very small value of ≈0.09 W m−1 K−1 in the reduced graphene oxide films annealed at 1000 °C. The obtained films demonstrate an exceptionally strong anisotropy of the thermal conductivity, K/K⊥ ≈ 675, which is substantially larger even than in the high-quality graphite. The electrical resistivity of the annealed films reduces to 1–19 Ω □−1. The observed modifications of the in-plane and cross-plane thermal conductivity components resulting in an unusual K/K⊥ anisotropy are explained theoretically. The theoretical analysis suggests that K can reach as high as ≈500 W m−1 K−1 with the increase in the sp2 domain size and further reduction of the oxygen content. The strongly anisotropic heat conduction properties of these films can be useful for applications in thermal management.

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Topics: Thermal conduction (60%), Thermal conductivity (57%), Graphene (53%) ... read more

362 Citations


Open accessJournal ArticleDOI: 10.1016/J.MSSP.2013.05.018
Abstract: Nickel oxide (NiO) nanoparticles were successfully synthesized by the reaction of nickel chloride with hydrazine at room temperature and thermal decomposition of the precursor nickel hydroxide (Ni(OH) 2 ) nanoparticles. The products were characterized by X-ray diffraction, Transmission electron microscopy, Fourier transform infrared spectroscopy, and UV–vis absorption spectroscopy. The result of thermogravimetric analysis showed that the Ni(OH) 2 nanoparticles are calcinated at ∼400 °C. The interactions between NiO nanoparticles and glucose have been studied using UV–vis absorption and fluorescence spectroscopy. The zeta-potential of NiO nanoparticles was used to gain insight about the interaction mode between NiO nanoparticles and glucose.

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Topics: Nickel oxide (60%), Fourier transform infrared spectroscopy (55%), Nickel (54%) ... read more

332 Citations


Journal ArticleDOI: 10.1016/J.ELECTACTA.2004.05.012
Abstract: Nanostructured CuO thin films were prepared by using a spray pyrolysis method, copper acetate as precursor and stainless steel as substrate. The textural and structural properties of the films were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The SEM images revealed thorough coating of the substrate and thickness of 450‐1250 nm; the average particle size as determined from the AFM images ranged from 30 to 160 nm. The XRD patterns revealed the formation of CuO alone and the XPS spectra confirmed the presence of Cu 2+ as the main oxidation state on the surface. The films were tested as electrodes in lithium cells and their electrochemical properties evaluated from galvanostatic and step potential electrochemical spectroscopy (SPES) measurements. The discharge STEP curves exhibited various peaks consistent with the processes CuO , Cu2O , Cu and with decomposition of the electrolyte, a reversible process in the light of the AFM images. The best electrode exhibited capacity values of 625 Ah kg � 1 over more than 100 cycles. This value, which involves a CuO , Cu reversible global reaction, is ca. 50% higher than that reported for bulk CuO. The nanosize of the particles and the good adherence of the active material to the substrate are thought to be the key factors accounting for the enhanced electrochemical activity found. 2004 Elsevier Ltd. All rights reserved.

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Topics: X-ray photoelectron spectroscopy (53%), Scanning electron microscope (52%), Thin film (51%) ... read more

176 Citations


Journal ArticleDOI: 10.1021/JA991098O
Abstract: R-Alumina results from the complete dehydration of several minerals of the form Al2O3‚nH2O. The "transition" aluminas, A-alumina, -alumina, and ‰-alumina are known to have a spinel structure but the possibility that they contain hydrogen (H) has been the subject of debate. We present a series of density- functional theory calculations which, together with available experimental data, show that the spinel aluminas exist over a range of hydrogen content captured by the empirical formula H3mAl2-mO3, with different greek- letter phases corresponding to different distributions of the Aluminum (Al) ions on the two cation sublattices. Calculations of densities and vibrational frequencies of bulk OH bonds are in excellent agreement with available data. The theory reconciles seemingly inconsistent data and reveals a remarkable property of the spinel aluminas: They are "reactive sponges" in that they can store and release water in a reactive way. This chemical activity offers a basis for understanding long-standing puzzles in the behavior of aluminas in catalytic systems.

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Topics: Spinel (52%)

172 Citations