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Showing 1 to 20 of 73 for “"water oxidation"”.
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ELECTROCATALYTIC WATER OXIDATION BY METAL ORGANIC FRAMEWORKS
… SYNTHESIZED AND TESTED AS ELECTROCATALYSTS FOR WATER OXIDATION. AMONG THEM, CO(BTC) SHOWED EXTRAORDINARY ACTIVITY. THE CATALYTIC ONSET OVERPOTENTIAL OF CO(BTC) IS 400 MV AND THE STABILITY OF CO(BTC) LASTS AS LONG AS 75 MIN AT A 0.5 MA/CM2 CURRENT DENSITY UNDER ANODIC POTENTIAL OF 1.1 V. ITS …
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An evaluation of supercritical water oxidation technology
Water exists in a supercritical state above its supercritical temperature, 374.2 °C, and pressure, 22.1 :MPa. When organic waste is placed in a reactor with supercritical water, the vaporization, oxidation, and destruction of the organic compounds is achievable in a short time span, typically less …
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Development Of Ruthenium/terpyridine Complexes For Water Oxidation
… is focused on developing catalysts for water oxidation. In this regard, a series of unsysmmetrical ruthenium complexes of type [Ru(terpy-R)(phen-X)Cl]PF6 where terpy-R= 4'-(4-methylmercaptophenyl)-2,2':6'2"-terpyridine and phen-X=H (1), X= 5-nitro (2), X=5,6-dimethyl (3), and X= …
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Computationally-Derived Design Principles for Water Oxidation Catalysts
The water oxidation reaction can be used to produce renewable solar fuels, but efficient catalysts need to be discovered to enable its use at the industrial scale. The most active known water oxidation catalysts (WOCs) follow a common theme in chemical catalysis, relying on rare metals such as …
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Functionalized Metal-Organic Frameworks for Water Oxidation Catalysis
… utilizing solar energy to drive reactions like water splitting, solar fuels system are able to produce valuable energy resource. Catalysts for water oxidation are the essential component of water splitting cells which have been intensively studied. As a solid state porous crystalline material …
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Catalytic supercritical water oxidation of nitrogen-containing organic compounds
The results of the catalytic oxidation in supercritical water of two non-biodegradable and highly toxic nitrogen-containing organic compounds (DBU and quinoline) are presented. The reactions were studied in a tubular xed-bed reactor over three catalysts: Pt/Al\(_2\)O\(_3\), CuO/Al \(_2\)O\(_3\) and …
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Investigations of the water oxidation complex in PS II
In this thesis an attempt was made to take the water oxidizing complex apart in a controlled way and to reconstitute it to its functional form.
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Theoretical investigation of solar energy conversion and water oxidation catalysis
Solar energy conversion and water oxidation catalysis are two great scientific and engineering challenges that will play pivotal roles in a future sustainable energy economy. In this work, I apply electronic structure theory and molecular dynamics simulation methods to understand some of the …
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Solar Water Oxidation by Composite Cobalt-Based Catalyst/Oxide Semiconductor Photoanodes
Photoelectrochemical (PEC) water splitting is an attractive approach to capturing and storing the earth's abundant solar energy influx. The challenging four-electron water-oxidation half-cell reaction has hindered this technology, giving rise to slow water oxidation kinetics at the photoanode …
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Effect of iron content on electrodeposited Fe-MnOx catalysts for water oxidation
… and known to be efficient catalysts for the water oxidation reaction (WOR). I present the exploration of an optimal method of cathodically electrodepositing MnOx catalysts on an FTO substrate, allowing for quick synthesis and a homogeneous coverage of the substrate. I then study WOR activity …
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Preliminary corrosion studies of candidate materials for supercritical water oxidation reactor systems
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Sciences & Engineering, 1994.
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Understanding the active sites and reaction mechanism of water oxidation on metal oxides
… it to hydrogen using proton exchange membrane water electrolyzers, which are amenable to integration with solar devices due to their high performance under fluctuating power input. Water oxidation to molecular oxygen is the most energy intensive part of the water splitting process, limiting the …
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General reviews of electrochemical and corrosion phenomena under conditions associated with supercritical water oxidation
Supercritical Water Oxidation (SCWO) is a promising technology for destroying highly toxic organic compounds present in aqueous waste streams. Organic wastes that have been identified as possible targets for destruction by SCWO include EPA-regulated organic wastes, organic components of DOE mixed …
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An investigation of corrosion mechanisms of constructional alloys in supercritical water oxidation (SCWO) systems
Supercritical water oxidation (SCWO) is a technology that can effectively destroy aqueous organic waste above the critical point of pure water. These waste feed streams are very aggressive and pose material performance issues. As potential alloys in construction of SCWO systems, nickel-base alloys …
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Spectroscopic Characterization of the Water-Oxidation Intermediates in the Ru-Based Catalysts for Artificial Photosynthesis
… energy by fuel-forming reactions, such as water splitting into hydrogen and oxygen. Ruthenium complexes are among few molecular-defined catalysts capable of water splitting. Insight into the mechanism of their action will help to design future robust and economically feasible catalysts for …
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Characterization of Polynuclear Mixed-Valence Manganese Complexes as Models of the Water Oxidation Site in Photosystem II
… the electronic structure of the manganese water oxidation site of the photosystem II, a number of polynuclear mixed-valence manganese complexes are characterized by means of various physical methods such as electrochemistry, EPR spectroscopy and magnetic susceptibility measurements. …
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Experimental and ab initio investigations into the fundamentals of corrosion, in the context of supercritical water oxidation systems
Supercritical water oxidation (SCWO) is a process which runs at 250 bar and 400- 6000 C to effect rapid and complete destruction of aqueous organics. The SCWO process streams are very corrosive and pose a materials performance challenge to even noble metals and the most advanced alloys. Corrosion …
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Preparation Of Mesoporous Silica Supported Ruthenium Oxides And The Application And Kinetic Study In The Catalysis Of Water Oxidation
<p>Photo-induced water splitting of water into H2 and O2 has been a major focus in the development of clean and renewable energy. The development of viable and efficient catalysts that facilitates O2 production remains the major challenge in the study of the corresponding half-reaction of water …
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Water oxidation catalysis beginning with cobalt polyoxometalates: determining the dominant catalyst under electrocatalytic conditions and investigation of the surface properties of Co3O4 nanoparticles
… for a renewable energy future. Electrocatalytic water splitting can take energy from virtually any power source and split water into oxygen and hydrogen, thereby creating a renewable feedstock of hydrogen. The efficiency of electrocatalytic water splitting is limited by the anodic half reaction, …
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Investigations of Electron Transport Properties in Metal-Organic Frameworks for Catalytic Applications
… of the framework. The catalytic ability toward water oxidation of two MOFs was investigated electrochemically. Initial studies focused on a cobalt-based MOF comprised of 2-pyrimidinolate (pymo) linkers, designated as Co(pymo)2, which was prepared on FTO via drop-casting and used for …
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