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John W Weidner - One of the best experts on this subject based on the ideXlab platform.
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capacitance studies of cobalt Oxide Films formed via electrochemical precipitation
Journal of Power Sources, 2002Co-Authors: Venkat Srinivasan, John W WeidnerAbstract:Abstract Cobalt Oxide Films were prepared by electrochemically precipitating the hydrOxide and heating it in air to form Co3O4. The resulting Oxide Films behave as a capacitor. The materials were studied emphasizing their use as either positive or negative electrodes in devices. The capacitance of the material was estimated at different heating temperatures and insight was gained into the charge storage mechanism. It was seen that the charge storage in cobalt Oxide was similar to that of nickel Oxide, although their capacitances were different. While, the material was shown to be inferior to nickel hydrOxide/Oxide when used as a positive electrode, it was seen to be superior as a negative. An asymmetric capacitor with NiO as a positive electrode and Co3O4 as a negative promises adequate capacitance over a large voltage window.
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studies on the capacitance of nickel Oxide Films effect of heating temperature and electrolyte concentration
Journal of The Electrochemical Society, 2000Co-Authors: Venkat Srinivasan, John W WeidnerAbstract:Nickel Oxide Films were prepared by electrochemically precipitating the hydrOxide and heating it in air to form the Oxide. The resulting Oxide Films behave as a capacitor. The capacitance of the Oxide depends on the heating temperature, showing a maximum at 300 C. The mechanism of charge storage was studied by measuring the capacitance and surface area as a function of heating temperature, and the capacitance in different electrolytes and potential windows. The charge-storage mechanism is believed to be a surface redox reaction involving adsorbed hydroxyl ions.
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studies on the capacitance of nickel Oxide Films effect of heating temperature and electrolyte concentration
Journal of The Electrochemical Society, 2000Co-Authors: Venkat Srinivasan, John W WeidnerAbstract:Nickel Oxide Films were prepared by electrochemically precipitating the hydrOxide and heating it in air to form the Oxide. The resulting Oxide Films behave as a capacitor. The capacitance of the Oxide depends on the heating temperature, showing a maximum at 300°C. The mechanism of charge storage was studied by measuring the capacitance and surface area as a function of heating temperature, and the capacitance in different electrolytes and potential windows. The charge‐storage mechanism is believed to be a surface redox reaction involving adsorbed hydroxyl ions. © 2000 The Electrochemical Society. All rights reserved.
R Kumar - One of the best experts on this subject based on the ideXlab platform.
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electrical and optical properties of tin Oxide and antimony doped tin Oxide Films
Optical Materials, 2004Co-Authors: Garima Jain, R KumarAbstract:Tin Oxide and antimony doped tin Oxide thin Films are prepared by spray pyrolysis technique onto glass substrates. The electrical and optical properties of these Films have been investigated as a function of dopant concentration, which was varied between 0 and 10 mol% of antimony. The transmission and reflection spectra are studied and the quality factor is calculated for these Films. The transmission of undoped tin Oxide Films and of smaller dopant concentration Films is higher in comparison to higher dopant concentration Films, while the lowest resistivity is found to exist for 3 mol% of antimony. The quality factor of antimony doped tin Oxide Films comes out to be highest for 0.5 mol% of dopant concentration.
Bernd Szyszka - One of the best experts on this subject based on the ideXlab platform.
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manufacture of specific structure of aluminum doped zinc Oxide Films by patterning the substrate surface
Applied Physics Letters, 2002Co-Authors: Xin Jiang, C L Jia, Bernd SzyszkaAbstract:(0001)-oriented aluminum-doped zinc Oxide Films were prepared using a magnetron sputtering technique. High-resolution transmission-electron-microscopic images show that the oriented grains nucleate directly on the substrate surface and grow with equal lateral dimensions through the film thickness. A surface-energy-driven self-texture mechanism was proposed on the basis of process modes. A method for manufacturing specific film structure by patterning the substrate surface is tested and discussed.
Cheuk Wan Leung - One of the best experts on this subject based on the ideXlab platform.
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fabrication of hierarchical porous iron Oxide Films utilizing the kirkendall effect
Chemical Communications, 2005Co-Authors: Lizhi Zhang, Zhi Zheng, Jimmy C Yu, Cheuk Wan LeungAbstract:Hierarchical porous iron Oxide Films with different morphologies have for the first time been fabricated through hydrothermal reactions between an iron substrate and iodine powder in water or ethanol, which can be explained by a mechanism analogous to the Kirkendall effect.
Curtis P Berlinguette - One of the best experts on this subject based on the ideXlab platform.
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photodecomposition of metal nitrate and chloride compounds yields amorphous metal Oxide Films
Journal of the American Chemical Society, 2017Co-Authors: Jingfu He, David M Weekes, Wei Cheng, Kevan E Dettelbach, Aoxue Huang, Tengfei Li, Curtis P BerlinguetteAbstract:UV light is found to trigger the decomposition of MClx or M(NO3)x (where M = Fe, Co, Ni, Cu, or Zn) to form uniform, amorphous Films of metal Oxides. This process does not elevate the temperature of the substrate and thus conformal Films can be coated on a range of substrates, including rigid glass and flexible plastic. The formation of the Oxide Films were confirmed by a combination of powder X-ray diffraction, X-ray photoelectron spectroscopy, X-ray fluorescence spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy techniques. Amorphous Oxide Films of iron, nickel and a combination of iron and nickel demonstrated oxygen evolution reaction electrocatalytic activities commensurate with Films of the same compositions prepared by widely used electrodeposition and sputtering methods. These results illuminate a potential route to amorphous Oxides at scale using simple metal precursors without vacuum or heat.
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water oxidation catalysis electrocatalytic response to metal stoichiometry in amorphous metal Oxide Films containing iron cobalt and nickel
Journal of the American Chemical Society, 2013Co-Authors: Rodney D L Smith, Mathieu S Prevot, Randal D Fagan, Simon Trudel, Curtis P BerlinguetteAbstract:Photochemical metal–organic deposition (PMOD) was used to prepare amorphous metal Oxide Films containing specific concentrations of iron, cobalt, and nickel to study how metal composition affects heterogeneous electrocatalytic water oxidation. Characterization of the Films by energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed excellent stoichiometric control of each of the 21 complex metal Oxide Films investigated. In studying the electrochemical oxidation of water catalyzed by the respective Films, it was found that small concentrations of iron produced a significant improvement in Tafel slopes and that cobalt or nickel were critical in lowering the voltage at which catalysis commences. The best catalytic parameters of the series were obtained for the film of composition a-Fe20Ni80. An extrapolation of the electrochemical and XPS data indicates the optimal behavior of this binary film to be a manifestation of iron stabilizing nickel in a higher oxidation level. This work ...
