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.
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Showing 1 to 20 of 54 for “"porous carbon"”.
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Designer Porous Carbon Electrodes for Redox Flow Batteries
Porous carbon electrodes play an important role in electrochemical systems by providing electrocatalytic sites to facilitate faradaic reactions, distributing reactants and products, and conducting electrons and heat. The microstructure and surface chemistry of such electrodes are of particular …
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Block Copolymer Derived Porous Carbon Fiber for Energy and Environmental Science
… and devices which address resource challenges. Carbon serves as a versatile material for a wide range of applications including purification, separation, and energy storage owing to excellent electrical, physical, and mechanical properties. One-dimensional (1D) carbon fiber in particular is …
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Characterization of nano-scaled metal-hydrides confined in nano-porous carbon frameworks
"Metal hydrides are currently being studied to provide hydrogen for use in fuel cells and for transportation applications. Hydrogen can be stored in chemical compounds at higher density and lower volume than liquid H₂ or compressed gas. Thermodynamic properties of metal hydrides differ between bulk …
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Preparation, characterisation and modification of porous carbon monolithic materials for chromatographic and electrochemical applications
… Within this thesis the preparation of carbon monoliths of varying flow through porosity for potential chromatographic and electrochemical applications is described. Carbon based monoliths can provide excellent chemical and thermal stability, surpassing those of silica. Unlike …
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Porous Carbon Fiber Functionalization and Thermochemical Degradation of Polystyrene-based Plastics for Resource Recovery
… caused by plastic waste accumulation. First, porous carbon fiber (PCF) derived from PAN-based block copolymer was synthesized and functionalized for the extraction of REEs. Second, the thermochemical degradation of PS and PS-based engineering plastic into benzene and alkylbenzene were …
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Low-cost, highly-damped, precision linear motion using porous carbon air bearings and epoxy replication
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Characterization of manganese oxide coated porous carbon aerogel to isolate the effects of electro-less deposition time, li+ -ion exchange, and heat treatment on ion selectivity and specific capacitance
… storage [2]. In this study, the performance of porous carbon aerogel electrodes, in terms of energy storage capacity and ion selectivity, is evaluated by varying fabrication techniques - altering electro-less deposition time of amorphous MnO_2, heat treatment for the purposes of phase …
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Biomass derived carbon for new energy storage technologies
… deals with the production and evaluation of porous carbon materials for energy storage technologies, namely super capacitors and lithium sulfur batteries.
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Ultrasound-assisted synthesis and processing of carbon materials
Part I: Porous carbons are of interest in many applications because of their high surface areas and other physicochemical properties, and much effort has been directed towards developing new methods for controlling the porosity of carbons. Ultrasonic spray pyrolysis (USP) is an aerosol method …
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Micro- and nanostructured materials via ultrasonic spray pyrolysis
… microstructures have been synthesized, such as porous, core- shell, and hierarchical structures. Great emphasis has been put on the use of facile and environmental benign synthetic approaches to produce structured materials in a controllable manner. As a simple and industrially scalable …
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Preparation, Evaluation and Structural Modeling of Carbon-Based Adsorbents Used on Natural Gas Vehicles
Activated carbon adsorbents are widely used in the chemical and environmental industries due to their large surface areas and strong ability to adsorb gases and liquids. In this study, activated carbons are prepared from low cost materials, and their application in natural gas storage is …
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An investigation of nafion electrospray emitter tips
… sulfonic acid ionomer, as an alternative to the porous materials currently used for electrospray emitters. A common, repeatable method of manufacturing Nafion single emitter tips and arrays with different mixture ratios of Nafion and EMI BF₄ is developed and refined. This method utilizes 3D …
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Theoretial studies of carbon-based nanostrutured materials with applications in hydrogen storage
… goal of this work is to search for new stable porous carbon-based materials, which have the ability to accommodate and store hydrogen gas. Theoretical and experimental studies suggest a close relation between the nano-scale structure of the material and its storage capacity. In order to design …
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Improving energy and power densities of three-dimensional next generation secondary battery electrodes
… using either structured current collector or carbon-based additives, e.g. carbon nanotubes, reduced graphene oxides, etc. Majority of these work focus on improving electrical conductivity and thus rate performance of the electrodes. However, this strategy is not panacea, there are various …
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Surface chemistry design and characterization of anion exchange and activated carbon fibers for critical contaminants removal
… The first project is to study activated carbon fiber composites (ACFCs) for removal of NH3 from air. Three series of materials were synthesized and modified, namely Polyvinyl alcohol (PVA) based Chemically Activated Carbon Fibers (CAFs) with optimized activation temperatures, Kynol based …
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Synthesis, Structure and Properties of Various Carbon Nanomaterials
Carbon nanomaterials can have a unique place in the field of nanotechnology thanks to their exceptional electrical, optical, chemical, and mechanical properties, and thus they have become promising for a diverse array of applications. More importantly, the properties of a specific carbon …
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Fabrication of carbon-aerogel electrodes for use in phosphoric acid fuel cells
… was done to determine the ability to fabricate carbon aerogel electrodes for use in a phosphoric acid fuel cell (PAFC). It was found that the use of a 25% solution of the surfactant Cetyltrimethylammonium chloride (CTAC) in water resulted in the creation of micelle within the pores of the …
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Advanced Carbon Materials Based Electrodes for High Performance Symmetric Supercapacitors
… in the final performance of supercapacitors. Carbon, usually used as symmetric supercapacitors electrode materials, exhibit extraordinary stability in harsh electrolyte and electrochemical performance owing to its physical and chemical properties. In addition, porous structure originated from …
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Oxocarbon-derived porous carbonaceous materials for electrocatalysis
… underscores the necessity for advanced carbon materials with specific structural and functional attributes. Porous carbon materials, characterized by their high specific surface area and tunable pore structures, are particularly promising for electrocatalysis. However, the rational …
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