Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 47 for “"cobalt oxide"”.
-
A study of lithium/cobalt oxide electrochemical cells
… behaviour of high temperature Li-Al/LiCl, KCl/cobalt oxide cells was investigated. Powder X-ray diffraction techniques were used for the qualitative analysis of the phases generated during charge and discharge of the cells.
-
Determination of the synthesis diagram of sodium cobalt oxide and electrochemical study
A complete and uniform synthesis diagram of NaxCoO₂ has been proposed based on forty-one samples synthesized at various temperatures from 450°C to 750°C by solid-state reactions with initial Na:Co ratio ranging from 0.60 to 1.05. Four monophasic domains of' O3, O3', P3' and P2 and four biphasic …
-
Semiconducting tin oxide and cobalt oxide films for future solar energy applications
… to other useful forms of energy. Semiconducting oxide thin films have potential applicability in photovoltaic conversion of solar energy to electrical energy and thermal energy collection or reflection. Pyrolytic thin films of Sn02-x and r. f. sputtered thin films of CoOx were prepared in this …
-
Preferential oxidation of carbon monoxide in hydrogen-rich gases over supported cobalt oxide catalysts
… Co₃O₄/Al2o₃ catalysts give rise to irreducible cobalt aluminate-like species. Under CO oxidation and CO-PROX reaction conditions, such strong interactions in a similar catalyst can have a negative effect on the performance of Co₃O₄ but can keep its chemical phase intact i.e., help prevent the …
-
Supported Cobalt Oxide Catalysts for the Preferential Oxidation of Carbon Monoxide: An in situ Investigation
… and phase stability. CO oxidation over metal oxides such as Co3O4, is believed to proceed via the Mars-van Krevelen mechanism, which depends on the surface of the catalyst being reducible in order to release lattice oxygen species. Generally, strong metal-support interactions (MSIs) or …
-
In Situ Studies of Surface Electric Field on Cobalt Oxide Electrode Surfaces with Second Harmonic Generation (SHG)
Cobalt compounds are proven to be efficient electrochemical (EC) catalysts, and the surface electric field may partly explain the efficiency. Surface electric field indicates electron/hole separation, and accumulation in the space charge layer, which can be probed in situ by electric field-induced …
-
The Incorporation of Graphene to Lithium Cobalt Oxide as a Cathode to Improve the Performance of Lithium Ion Batteries
… investigate the cathode performance of lithium cobalt oxide (LiCoO2) incorporated with graphene powder in lithium ion batteries (LIBs). Graphene powder was incorporated into cathode materials to enhance the performance of LIBs. The other objective was to impede the construction of a solid …
-
The break-in behaviors of the cobalt oxide-molybdena-alumina catalyst and the tungsten oxide on silica catalyst during propylene disproportionation
… studied during propylene disproportionation. A cobalt oxide-molybdena-alumina (CoO-MoO₃—Al₂O₃) catalyst was found to undergo a rapid increase in the catalytic activity during the first 100 seconds of contacting with the reactants and this was the order of magnitude of the mass transport delays. …
-
Catalysis by transition metal compounds
"The catalytic properties of cobalt oxide (CoO) were investigated theoretically. The interactions of atomic hydrogen with small clusters of atoms, representing cobalt oxide surfaces, were calculated using the ab initio Unrestricted Hartree-Fock (UHF) method. The electronic structure of the bulk …
-
Samarium strontium cobalt oxide – samarium doped ceria carbonate (SSC-SDCC) as a new potential composite cathode material for low temperature solid oxide fuel cell
… achieved with other low temperature solid oxide fuel cell (LTSOFC) components. LTSOFC based on SDCC electrolyte display lower of area specific resistance (ASR) with high value of stability and porosity. This study focuses to investigate the correlation of powder composition and calcination …
-
Inverse model systems to investigate metal-support interactions in Fischer-Tropsch catalysis
… will alter the catalytic properties of the cobalt site to which silane is bonded and the adjacent ligand-free sites. The desire is to understand the effects of metal support interactions obtained after reduction of the model system on its performance in FischerTropsch synthesis, which was …
-
Modeling of Electronic and Ionic Transport Resistances Within Lithium-Ion Battery Cathodes
… cathodes at high discharge rates. Lithium cobalt and ruthenium oxides were tested and modeled individually and together in mixed-oxide cathodes to understand how the superior material properties relative to each other can work together to reduce cell resistances while maximizing energy …
-
Sodium chlorate oxygen generation for fuel cell power systems
… Two grams of sodium chlorate with nanoscale cobalt oxide catalyst were loaded into a reaction chamber and heated until decomposition. Afterwards a piston was used to eject the materials from the reaction chamber. This method proved to be safer and more reliable than similar chlorate-based …
-
Ab-initio study of cathode materials for lithium batteries
… upon lithiated α-NaFeO₂ type 3d transition metal oxide structures. It is found that the ligand field stabilization energy (LFSE) is of particular importance in stabilizing the α-NaFeO₂ type layered structure with general formula Li[sub]x MO₂ (0 <[or equal to] x <[or equal to] 1 and M = Co, Fe, Mn, …
-
Virus-enabled synthesis and 2D/3D assembly of nanowire networks
… describe the virus-enabled synthesis of titanium oxide nanowires and their incorporation in layer-by-layer polyelectrolyte assemblies for use in dye sensitized solar cells. In Chapter 3, we describe a two-dimensional network of virus-templated cobalt oxide nanowires integrated into ultrathin …
-
The Design and Optimization of a Lithium-ion Battery Direct Recycling Process
… market in a variety of applications. Lithium cobalt oxide (LiCoO2) is one of the most common cathode materials for LIBs in consumer electronics. The recycling of LIBs is important because cobalt is an expensive element that is dependent on foreign sources for production. Lithium-ion batteries …
-
Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production
… but not eliminated, thus a variety of metal oxide catalysts for oxidation of ammonia to nitrogen oxides have been studied. Cobalt oxide seems to be the most promising alternative for platinum exhibiting a high activity and selectivity towards NO. The aim of this study is to explore the use of …
-
Lithium intercalation reactions with transition metal oxides
… of several lithium transition metal oxide systems has been undertaken with the aim of synthesising an optimised LiM0₂ compound (M = Mn, Co or Co/Ni mixtures) for application as a cathode in rechargeab1e lithium batteries. Attention has been focused on systems which show promise for …
Page 1 of 3