Oxide

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Aicheng Chen - One of the best experts on this subject based on the ideXlab platform.

  • high performance supercapacitor based on tantalum iridium Oxides supported on tungsten Oxide nanoplatelets
    Electrochemistry Communications, 2016
    Co-Authors: Sapanbir S. Thind, Xin Chang, Jordan S. Wentzell, Aicheng Chen
    Abstract:

    Here we report on a novel supercapacitor electrode based on IrO2–Ta2O5 nanoparticles supported on WO3 nanoplatelets. The nanoplatelets were directly grown on a W plate using a facile hydrothermal method, whereas the IrO2–Ta2O5 nanoparticles were formed via a thermal decomposition technique which can be easily scaled up. The structural, morphological, and electrochemical properties of the WO3 nanoplatelets and the formed trimetallic Oxide nanocomposite have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), cyclic voltammetry (CV), and charging/discharging techniques. The fabricated trimetallic Oxide nanocomposite exihibited rectangular cyclic voltamograms even tested at high potential scan rates, a high specific capacitance and high charging/discharging stability, promising utilization in the design of high-performance devices for energy storage.

  • High-performance supercapacitor based on tantalum iridium Oxides supported on tungsten Oxide nanoplatelets
    Elsevier, 2016
    Co-Authors: Sapanbir S. Thind, Xin Chang, Jordan S. Wentzell, Aicheng Chen
    Abstract:

    Here we report on a novel supercapacitor electrode based on IrO2–Ta2O5 nanoparticles supported on WO3 nanoplatelets. The nanoplatelets were directly grown on a W plate using a facile hydrothermal method, whereas the IrO2–Ta2O5 nanoparticles were formed via a thermal decomposition technique which can be easily scaled up. The structural, morphological, and electrochemical properties of the WO3 nanoplatelets and the formed trimetallic Oxide nanocomposite have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), cyclic voltammetry (CV), and charging/discharging techniques. The fabricated trimetallic Oxide nanocomposite exihibited rectangular cyclic voltamograms even tested at high potential scan rates, a high specific capacitance and high charging/discharging stability, promising utilization in the design of high-performance devices for energy storage. Keywords: Energy storage, Supercapacitance, Iridium and tantalum Oxides, Tungsten Oxide nanoplatelet

Regina Palkovits - One of the best experts on this subject based on the ideXlab platform.

  • silver doped cobalt magnesium aluminum mixed metal Oxides as potential catalysts for nitrous Oxide decomposition
    Chemcatchem, 2018
    Co-Authors: Eng Magdalena Jablonska, Lorenzo Buselli, Eng Marek Nocun, Regina Palkovits
    Abstract:

    N2O is a potent greenhouse gas released among others in nitric and adipic acid production as well as from stationary and mobile combustion sources. A catalytic decomposition is highly attractive but requires catalysts active over a broad temperature range and in the presence of inhibiting compounds such as NO and O2. Ag-doped Co-(Mg)-Al-Ox mixed metal Oxides obtained by the coprecipitation of metal nitrate precursors followed by calcination were evaluated as potential catalysts for N2O decomposition (deN2O) also in the presence of NO and/or O2. Ag integration during synthesis proved to be essential for superior catalytic activity. The catalyst with the optimum composition, AgCo3Al-Ox (Co/Al=3:1 mol %, 1.0 wt % Ag), achieved full N2O conversion at 350 and 450 °C under N2O/N2 and N2O/NO/O2/N2 conditions, respectively. Catalyst characterization, with a focus on H2 temperature-programmed reduction and X-ray photoelectron spectroscopy, evidenced that abundant Ag0 on the surface of (1.0–2.8 wt %)AgCo3Al-Ox enhanced the reduction of cobalt spinels to enable the superior catalytic performance.

  • nitrogen Oxide removal over hydrotalcite derived mixed metal Oxides
    Catalysis Science & Technology, 2016
    Co-Authors: Magdalena Jablonska, Regina Palkovits
    Abstract:

    Rigorous regulations of nitrogen Oxide emissions require the development of technologies for their removal from exhaust gases. Implementation of appropriate catalysts can potentially promote NOx (NO, NO2) or N2O removal in shorter reaction time and under milder operation conditions. However, several challenges have to be faced upon trying to address nitrogen Oxide pollution with catalytic systems such as sufficient catalytic performance, suitable operational temperatures and catalyst poisoning. The flexible structure of hydrotalcite-like compounds offers the opportunity to introduce various metals into the materials to provide active and selective catalysts for NOx and N2O removal. This minireview summarizes the abatement of nitrogen Oxides by using hydrotalcite-derived mixed metal Oxides. At first, a brief overview on the general features of hydrotalcite-originated mixed metal Oxides and their applications in catalysis is provided. Later on, the application of mixed metal Oxides as SCR catalysts with both ammonia (NH3-SCR) and hydrocarbons (HC-SCR) as reducing agents is discussed. An overview of the mixed metal Oxides applied as catalysts for NOx storage/reduction (NSR) and further in the simultaneous removal of NOx and soot particles is provided. Additionally, this review discusses mixed metal Oxides as efficient catalysts for catalytic decomposition (deN2O) and selective catalytic reduction of N2O (N2O-SCR). Finally, the remaining challenges and future trends are highlighted.

Sapanbir S. Thind - One of the best experts on this subject based on the ideXlab platform.

  • high performance supercapacitor based on tantalum iridium Oxides supported on tungsten Oxide nanoplatelets
    Electrochemistry Communications, 2016
    Co-Authors: Sapanbir S. Thind, Xin Chang, Jordan S. Wentzell, Aicheng Chen
    Abstract:

    Here we report on a novel supercapacitor electrode based on IrO2–Ta2O5 nanoparticles supported on WO3 nanoplatelets. The nanoplatelets were directly grown on a W plate using a facile hydrothermal method, whereas the IrO2–Ta2O5 nanoparticles were formed via a thermal decomposition technique which can be easily scaled up. The structural, morphological, and electrochemical properties of the WO3 nanoplatelets and the formed trimetallic Oxide nanocomposite have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), cyclic voltammetry (CV), and charging/discharging techniques. The fabricated trimetallic Oxide nanocomposite exihibited rectangular cyclic voltamograms even tested at high potential scan rates, a high specific capacitance and high charging/discharging stability, promising utilization in the design of high-performance devices for energy storage.

  • High-performance supercapacitor based on tantalum iridium Oxides supported on tungsten Oxide nanoplatelets
    Elsevier, 2016
    Co-Authors: Sapanbir S. Thind, Xin Chang, Jordan S. Wentzell, Aicheng Chen
    Abstract:

    Here we report on a novel supercapacitor electrode based on IrO2–Ta2O5 nanoparticles supported on WO3 nanoplatelets. The nanoplatelets were directly grown on a W plate using a facile hydrothermal method, whereas the IrO2–Ta2O5 nanoparticles were formed via a thermal decomposition technique which can be easily scaled up. The structural, morphological, and electrochemical properties of the WO3 nanoplatelets and the formed trimetallic Oxide nanocomposite have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), cyclic voltammetry (CV), and charging/discharging techniques. The fabricated trimetallic Oxide nanocomposite exihibited rectangular cyclic voltamograms even tested at high potential scan rates, a high specific capacitance and high charging/discharging stability, promising utilization in the design of high-performance devices for energy storage. Keywords: Energy storage, Supercapacitance, Iridium and tantalum Oxides, Tungsten Oxide nanoplatelet

Joshua M Pearce - One of the best experts on this subject based on the ideXlab platform.

  • properties of al doped zinc Oxide and in doped zinc Oxide bilayer transparent conducting Oxides for solar cell applications
    Materials Letters, 2018
    Co-Authors: Marikkannan Murugesan, Dinesh Arjunraj, J Mayandi, Vishnukanthan Venkatachalapathy, Joshua M Pearce
    Abstract:

    Abstract Novel aluminum and indium doped zinc Oxide (ZnO) bilayer transparent conducting Oxide thin films was fabricated by simple sol-gel spin coating method and post-annealed at 500 °C for an hour under nitrogen ambient for solar cell applications. The structural, electrical and optical properties of both the as-deposited and annealed bilayer thin films were characterized. X-ray diffraction studies show a hexagonal wurtzite-type structure of ZnO with (0 0 2) orientation, which enhanced with annealing. In atomic force microscopy studies, minimum surface roughness was attained for Al-doped ZnO (AZO)/In-doped ZnO (IZO) bilayer TCO film compared to IZO/AZO bilayer film. The AZO/IZO film sheet resistance improved to 0.057 M ohm/square after post-annealing, while the single layer AZO film sheet resistance degraded upon annealing in nitrogen atmosphere. All the films had an average transmittance in the visible region over 96%.

Vishnukanthan Venkatachalapathy - One of the best experts on this subject based on the ideXlab platform.

  • properties of al doped zinc Oxide and in doped zinc Oxide bilayer transparent conducting Oxides for solar cell applications
    Materials Letters, 2018
    Co-Authors: Marikkannan Murugesan, Dinesh Arjunraj, J Mayandi, Vishnukanthan Venkatachalapathy, Joshua M Pearce
    Abstract:

    Abstract Novel aluminum and indium doped zinc Oxide (ZnO) bilayer transparent conducting Oxide thin films was fabricated by simple sol-gel spin coating method and post-annealed at 500 °C for an hour under nitrogen ambient for solar cell applications. The structural, electrical and optical properties of both the as-deposited and annealed bilayer thin films were characterized. X-ray diffraction studies show a hexagonal wurtzite-type structure of ZnO with (0 0 2) orientation, which enhanced with annealing. In atomic force microscopy studies, minimum surface roughness was attained for Al-doped ZnO (AZO)/In-doped ZnO (IZO) bilayer TCO film compared to IZO/AZO bilayer film. The AZO/IZO film sheet resistance improved to 0.057 M ohm/square after post-annealing, while the single layer AZO film sheet resistance degraded upon annealing in nitrogen atmosphere. All the films had an average transmittance in the visible region over 96%.