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Ta-jen Huang - One of the best experts on this subject based on the ideXlab platform.
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yttria stabilized zirconia supported Copper Oxide catalyst i effect of oxygen vacancy of support on Copper Oxide reduction
Journal of Catalysis, 1996Co-Authors: Yu-piao Wang, Ta-jen HuangAbstract:Copper Oxide was supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods. The reducibility and characteristics of the supported Copper Oxide catalysts with various Copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively. For CuO/γ–alumina catalyst, only two peaks were found in the TPR patterns. One with lower peak temperature has been attributed to the reduction of highly dispersed Copper ions; the other with higher peak temperature has been ascribed to the reduction of bulk-like Copper Oxide. For CuO/YSZ catalyst, four TPR peaks could be observed. Two TPR peaks with lower peak temperatures (namely, α1and α2) have been attributed to the hydrogen uptake of nested oxygen ions (NOIs) and temptable oxygen ions (TOIs), respectively. These are interface-boundary terminal oxygen ions of the supported Copper Oxide but have different environment and interaction with the surface oxygen vacancies of the YSZ support. The other two TPR peaks of CuO/YSZ catalyst were formed with the same reason as occurring on the CuO/γ–alumina. EPR has confirmed these structures and environments of these supported Copper Oxides. Two reduction mechanisms have been proposed for hydrogen reacting with the NOIs and the TOIs, respectively. The former case has been attributed to the function of oxygen-ionic transport of the YSZ support. The latter case was owing to the oxygen vacancies of YSZ acting as Lewis acid sites. In addition, a small but sharp TPR peak occurring at ca. 657°C was found in the TPR pattern of YSZ support. This peak has been attributed to the hydrogen uptake of surface capping oxygen ions of YSZ support which are coordinated beside the surface oxygen vacancies of YSZ.
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Yttria-Stabilized Zirconia Supported Copper Oxide Catalyst
Journal of Catalysis, 1996Co-Authors: Wei Ping Dow, Yu-piao Wang, Ta-jen HuangAbstract:Copper Oxide was supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods. The reducibility and characteristics of the supported Copper Oxide catalysts with various Copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively. For CuO/γ–alumina catalyst, only two peaks were found in the TPR patterns. One with lower peak temperature has been attributed to the reduction of highly dispersed Copper ions; the other with higher peak temperature has been ascribed to the reduction of bulk-like Copper Oxide. For CuO/YSZ catalyst, four TPR peaks could be observed. Two TPR peaks with lower peak temperatures (namely, α1and α2) have been attributed to the hydrogen uptake of nested oxygen ions (NOIs) and temptable oxygen ions (TOIs), respectively. These are interface-boundary terminal oxygen ions of the supported Copper Oxide but have different environment and interaction with the surface oxygen vacancies of the YSZ support. The other two TPR peaks of CuO/YSZ catalyst were formed with the same reason as occurring on the CuO/γ–alumina. EPR has confirmed these structures and environments of these supported Copper Oxides. Two reduction mechanisms have been proposed for hydrogen reacting with the NOIs and the TOIs, respectively. The former case has been attributed to the function of oxygen-ionic transport of the YSZ support. The latter case was owing to the oxygen vacancies of YSZ acting as Lewis acid sites. In addition, a small but sharp TPR peak occurring at ca. 657°C was found in the TPR pattern of YSZ support. This peak has been attributed to the hydrogen uptake of surface capping oxygen ions of YSZ support which are coordinated beside the surface oxygen vacancies of YSZ.
Yu-piao Wang - One of the best experts on this subject based on the ideXlab platform.
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yttria stabilized zirconia supported Copper Oxide catalyst i effect of oxygen vacancy of support on Copper Oxide reduction
Journal of Catalysis, 1996Co-Authors: Yu-piao Wang, Ta-jen HuangAbstract:Copper Oxide was supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods. The reducibility and characteristics of the supported Copper Oxide catalysts with various Copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively. For CuO/γ–alumina catalyst, only two peaks were found in the TPR patterns. One with lower peak temperature has been attributed to the reduction of highly dispersed Copper ions; the other with higher peak temperature has been ascribed to the reduction of bulk-like Copper Oxide. For CuO/YSZ catalyst, four TPR peaks could be observed. Two TPR peaks with lower peak temperatures (namely, α1and α2) have been attributed to the hydrogen uptake of nested oxygen ions (NOIs) and temptable oxygen ions (TOIs), respectively. These are interface-boundary terminal oxygen ions of the supported Copper Oxide but have different environment and interaction with the surface oxygen vacancies of the YSZ support. The other two TPR peaks of CuO/YSZ catalyst were formed with the same reason as occurring on the CuO/γ–alumina. EPR has confirmed these structures and environments of these supported Copper Oxides. Two reduction mechanisms have been proposed for hydrogen reacting with the NOIs and the TOIs, respectively. The former case has been attributed to the function of oxygen-ionic transport of the YSZ support. The latter case was owing to the oxygen vacancies of YSZ acting as Lewis acid sites. In addition, a small but sharp TPR peak occurring at ca. 657°C was found in the TPR pattern of YSZ support. This peak has been attributed to the hydrogen uptake of surface capping oxygen ions of YSZ support which are coordinated beside the surface oxygen vacancies of YSZ.
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Yttria-Stabilized Zirconia Supported Copper Oxide Catalyst
Journal of Catalysis, 1996Co-Authors: Wei Ping Dow, Yu-piao Wang, Ta-jen HuangAbstract:Copper Oxide was supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods. The reducibility and characteristics of the supported Copper Oxide catalysts with various Copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively. For CuO/γ–alumina catalyst, only two peaks were found in the TPR patterns. One with lower peak temperature has been attributed to the reduction of highly dispersed Copper ions; the other with higher peak temperature has been ascribed to the reduction of bulk-like Copper Oxide. For CuO/YSZ catalyst, four TPR peaks could be observed. Two TPR peaks with lower peak temperatures (namely, α1and α2) have been attributed to the hydrogen uptake of nested oxygen ions (NOIs) and temptable oxygen ions (TOIs), respectively. These are interface-boundary terminal oxygen ions of the supported Copper Oxide but have different environment and interaction with the surface oxygen vacancies of the YSZ support. The other two TPR peaks of CuO/YSZ catalyst were formed with the same reason as occurring on the CuO/γ–alumina. EPR has confirmed these structures and environments of these supported Copper Oxides. Two reduction mechanisms have been proposed for hydrogen reacting with the NOIs and the TOIs, respectively. The former case has been attributed to the function of oxygen-ionic transport of the YSZ support. The latter case was owing to the oxygen vacancies of YSZ acting as Lewis acid sites. In addition, a small but sharp TPR peak occurring at ca. 657°C was found in the TPR pattern of YSZ support. This peak has been attributed to the hydrogen uptake of surface capping oxygen ions of YSZ support which are coordinated beside the surface oxygen vacancies of YSZ.
Wei Ping Dow - One of the best experts on this subject based on the ideXlab platform.
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Yttria-Stabilized Zirconia Supported Copper Oxide Catalyst
Journal of Catalysis, 1996Co-Authors: Wei Ping Dow, Yu-piao Wang, Ta-jen HuangAbstract:Copper Oxide was supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods. The reducibility and characteristics of the supported Copper Oxide catalysts with various Copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively. For CuO/γ–alumina catalyst, only two peaks were found in the TPR patterns. One with lower peak temperature has been attributed to the reduction of highly dispersed Copper ions; the other with higher peak temperature has been ascribed to the reduction of bulk-like Copper Oxide. For CuO/YSZ catalyst, four TPR peaks could be observed. Two TPR peaks with lower peak temperatures (namely, α1and α2) have been attributed to the hydrogen uptake of nested oxygen ions (NOIs) and temptable oxygen ions (TOIs), respectively. These are interface-boundary terminal oxygen ions of the supported Copper Oxide but have different environment and interaction with the surface oxygen vacancies of the YSZ support. The other two TPR peaks of CuO/YSZ catalyst were formed with the same reason as occurring on the CuO/γ–alumina. EPR has confirmed these structures and environments of these supported Copper Oxides. Two reduction mechanisms have been proposed for hydrogen reacting with the NOIs and the TOIs, respectively. The former case has been attributed to the function of oxygen-ionic transport of the YSZ support. The latter case was owing to the oxygen vacancies of YSZ acting as Lewis acid sites. In addition, a small but sharp TPR peak occurring at ca. 657°C was found in the TPR pattern of YSZ support. This peak has been attributed to the hydrogen uptake of surface capping oxygen ions of YSZ support which are coordinated beside the surface oxygen vacancies of YSZ.
Chandrakant D. Lokhande - One of the best experts on this subject based on the ideXlab platform.
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fabrication of Copper Oxide multilayer nanosheets for supercapacitor application
Journal of Alloys and Compounds, 2010Co-Authors: Deepak P Dubal, V. S. Jamdade, Rahul R Salunkhe, Dattatray S. Dhawale, Chandrakant D. LokhandeAbstract:Abstract Copper Oxide multilayer nanosheets thin films have been formed using simple and inexpensive chemical bath deposition (CBD) method. These films were characterized using X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), Fourier transform infrared spectrum (FTIR), optical absorption and wettability test. The XRD pattern revealed that the Copper Oxide films are amorphous. Formation of Copper Oxide compound was confirmed from the FTIR studies. The FESEM images revealed the development of hierarchical multilayer nanosheets which covered the substrate surface. Surface wettability with liquid interface showed hydrophilic nature with water contact angle 53°. The optical absorption showed existence of direct optical band gap of energy 2.18 eV. The supercapacitive properties of Copper Oxide thin film investigated in 1 M Na 2 SO 4 electrolyte showed supercapacitance of 43 F g −1 at scan rate 10 mV s −1 .
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Fabrication of Copper Oxide multilayer nanosheets for supercapacitor application
Journal of Alloys and Compounds, 2010Co-Authors: Deepak P Dubal, V. S. Jamdade, Rahul R Salunkhe, Dattatray S. Dhawale, Chandrakant D. LokhandeAbstract:Copper Oxide multilayer nanosheets thin films have been formed using simple and inexpensive chemical bath deposition (CBD) method. These films were characterized using X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), Fourier transform infrared spectrum (FTIR), optical absorption and wettability test. The XRD pattern revealed that the Copper Oxide films are amorphous. Formation of Copper Oxide compound was confirmed from the FTIR studies. The FESEM images revealed the development of hierarchical multilayer nanosheets which covered the substrate surface. Surface wettability with liquid interface showed hydrophilic nature with water contact angle 53°. The optical absorption showed existence of direct optical band gap of energy 2.18 eV. The supercapacitive properties of Copper Oxide thin film investigated in 1 M Na2SO4 electrolyte showed supercapacitance of 43 F g-1 at scan rate 10 mV s-1. © 2009 Elsevier B.V. All rights reserved.
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electrodeposited porous and amorphous Copper Oxide film for application in supercapacitor
Materials Chemistry and Physics, 2009Co-Authors: V D Patake, Chandrakant D. Lokhande, S S JoshiAbstract:Abstract In present study, the porous amorphous Copper Oxide thin films have been deposited from alkaline sulphate bath. The cathodic electrodeposition method was employed to deposit Copper Oxide film at room temperature on stainless steel substrate. Their structural and surface morphological properties were investigated by means of X-ray diffraction (XRD) and scanning electron micrograph (SEM), respectively. To propose this as a new material for possible application in the supercapacitor, its electrochemical properties have been studied in aqueous 1 M Na 2 SO 4 electrolyte using cyclic voltammetry. The structural analysis from XRD pattern showed the formation of amorphous Copper Oxide film on the substrate. The surface morphological studies from scanning electron micrographs revealed the formation of porous cauliflower-like Copper Oxide film. The cyclic voltammetric curves showed symmetric nature and increase in capacitance with increase in film thickness. The maximum specific capacitance of 36 F g −1 was exhibited for the 0.6959 mg cm −2 film thickness. This shows that low-cost Copper Oxide electrode will be a potential application in supercapacitor.
Vilwanathan Ravikumar - One of the best experts on this subject based on the ideXlab platform.
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Anticancer activity of Ficus religiosa engineered Copper Oxide nanoparticles.
Materials Science and Engineering: C, 2014Co-Authors: Renu Sankar, Kanchi Subramanian Shivashangari, Rajamanickam Maheswari, Selvaraju Karthik, Vilwanathan RavikumarAbstract:Abstract The design, synthesis, characterization and application of biologically synthesized nanomaterials have become a vital branch of nanotechnology. There is a budding need to develop a method for environmentally benign metal nanoparticle synthesis, that do not use toxic chemicals in the synthesis protocols to avoid adverse effects in medical applications. Here, it is a report on an eco-friendly process for rapid synthesis of Copper Oxide nanoparticles using Ficus religiosa leaf extract as reducing and protecting agent. The synthesized Copper Oxide nanoparticles were confirmed by UV–vis spectrophotometer, absorbance peaks at 285 nm. The Copper Oxide nanoparticles were analyzed with field emission-scanning electron microscope (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, dynamic light scattering (DLS) and X-ray diffraction (XRD) spectrum. The FE-SEM and DLS analyses exposed that Copper Oxide nanoparticles are spherical in shape with an average particle size of 577 nm. FT-IR spectral analysis elucidates the occurrence of biomolecules required for the reduction of Copper Oxide ions. Zeta potential studies showed that the surface charge of the formed nanoparticles was highly negative. The XRD pattern revealed that synthesized nanoparticles are crystalline in nature. Further, biological activities of the synthesized nanoparticles were confirmed based on its stable anti-cancer effects. The apoptotic effect of Copper Oxide nanoparticles is mediated by the generation of reactive oxygen species (ROS) involving the disruption of mitochondrial membrane potential (Δψm) in A549 cells. The observed characteristics and results obtained in our in vitro assays suggest that the Copper nanoparticles might be a potential anticancer agent.
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Anticancer activity of Ficus religiosa engineered Copper Oxide nanoparticles
Materials Science and Engineering C, 2014Co-Authors: Renu Sankar, Kanchi Subramanian Shivashangari, Rajamanickam Maheswari, Vilwanathan RavikumarAbstract:The design, synthesis, characterization and application of biologically synthesized nanomaterials have become a vital branch of nanotechnology. There is a budding need to develop a method for environmentally benign metal nanoparticle synthesis, that do not use toxic chemicals in the synthesis protocols to avoid adverse effects in medical applications. Here, it is a report on an eco-friendly process for rapid synthesis of Copper Oxide nanoparticles using Ficus religiosa leaf extract as reducing and protecting agent. The synthesized Copper Oxide nanoparticles were confirmed by UV-vis spectrophotometer, absorbance peaks at 285 nm. The Copper Oxide nanoparticles were analyzed with field emission-scanning electron microscope (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, dynamic light scattering (DLS) and X-ray diffraction (XRD) spectrum. The FE-SEM and DLS analyses exposed that Copper Oxide nanoparticles are spherical in shape with an average particle size of 577 nm. FT-IR spectral analysis elucidates the occurrence of biomolecules required for the reduction of Copper Oxide ions. Zeta potential studies showed that the surface charge of the formed nanoparticles was highly negative. The XRD pattern revealed that synthesized nanoparticles are crystalline in nature. Further, biological activities of the synthesized nanoparticles were confirmed based on its stable anti-cancer effects. The apoptotic effect of Copper Oxide nanoparticles is mediated by the generation of reactive oxygen species (ROS) involving the disruption of mitochondrial membrane potential (Δψm) in A549 cells. The observed characteristics and results obtained in our in vitro assays suggest that the Copper nanoparticles might be a potential anticancer agent. © 2014 Elsevier B.V.