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 22 for “"composite electrodes"”.
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Infiltrated composite electrodes for solid oxide fuel cells
… to minimized resistances from SOFC components (composite electrodes and electrolyte). Stability of the generated power is another important issue. Degradation of SOFCs with time due to microstructural processes or chemical reactions that occur at operating conditions; and due to …
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Microstructure Engineering of All-Solid-State Composite Electrodes
… enhanced safety and higher energy densities. Composite cathodes are pivotal in determining the areal capacity and specific energy of SSBs, making their design, fabrication and characterization an important research direction. This dissertation focuses on electrode microstructure engineering …
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Morphology and mechanical behavior of composite electrodes for Li-ion batteries
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-12-14T18:11:01Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 3 Verma_Ankit.docx: 25902052 bytes, checksum: 29ce28249278f74b2862021866fa71c1 (MD5) Verma_Ankit.pdf: 3510116 bytes, …
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Electrochemical Study of Ceramic (BaTiO3 based)/ Polymer Composite electrodes for Supercapacitor applications
… inclusion into the BaTiO3 system (CBTG) as a composite was studied. The polymer – ceramic three way composite system was studied at varying polymer and the ceramic mixture composition. A novel sandwich type electrochemical cell setup was developed to study the supercapacitor cell. The Nd doped …
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Carbon Paste Macrocycle Doped Composite Electrodes for the Selective Electrochemical Detection of Dopamine
… In this thesis, a number of carbon paste electrodes modified with macrocycles for the electrochemical detection of DA is reported. The different macrocycles employed were based on cyclodextrin derivatives and consist of sulfated β-CD (S-β-CD), carboxymethyl β-CD (CM-β-CD), Ferrocene …
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Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery
… discharge rate limitation within LiFePO4 composite electrode structures have been investigated. It was found that for composite electrodes containing ‘small particles’ of active material solid state processes are not necessarily rate limiting. A simple model has been developed to describe …
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Characterization and modification of carbon composite electrodes towards more affordable biosensing applications and integration into fluidic devices
… measurements with fast response times. Carbon composite electrodes are an attractive option for electrochemical detection due to their low cost, resistance to biological fouling, large electrochemical solvent windows, and ability to be patterned. However, they often suffer from poor …
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Mechanics of lithium-ion battery electrodes
… the strains induced in free-standing battery electrodes (i.e. unconstrained electrodes not adhered to a substrate) due to electrochemical processes. Graphite composite electrodes, similar to commercial battery anodes, were investigated first to garner baseline results. The electrodes were …
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Continuum modeling of electro-chemo-mechanical phenomena in all-solid-state batteries
… features a Lithium-metal anode, a solid-state composite cathode, and a stiff ceramic electrolyte. While an attractive alternative, commercialization of SSBs faces a series of chemo-mechanical issues across its constituents, namely growth induced fracture of solid-state electrolyte (SSE) due to …
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Investigation of flow-limited field-injection electrostatic spraying for nanofabrication and direct-write patterning: Application to dye-sensitized solar cells
… and control of TiO2 nanostructures and composite electrodes using this process, which prove effective in improving DSC performance. In addition, a surface treatment of the DSC electrodes is performed to investigate the relationships between the performance and the morphology and surface …
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Towards a lithium-ion fiber battery
… infiber battery architecture is composed of composite electrodes, which we fabricate and characterize. A model system is tested and a detailed pathway towards the first successful fabrication of a Li-ion fiber battery is given.
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Fundamental understanding and design principles of oxide/metal surfaces for lithium storage
… i.e., rotating disk electrode and Li2O2-filled composite electrodes, to quantify the intrinsic catalytic activity of nonaqueous oxygen reduction (ORR) and oxygen evolution reactions (OER). We found that the Li+-ORR activity is in order of Pd > Pt > Ru ~ Au > C, exhibiting a volcano-type …
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Understanding electronic structure and interfaces of positive electrodes for lithium ion batteries
… to study is electrode/electrolyte interface of electrodes. EEI on the negative electrode, also known as Solid Electrolyte Interphase (SEI) has the well-known structure with organic and inorganic compounds. Although EEI on negative electrodes is well known, it is not the case for positive …
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Investigation and Improvement of SofC Composite Cathodes
… performance, and long term stability of SOFC composite cathodes prepared by infiltration methods. The majority of the work that follows aims to improve the understanding of the processes contributing to cathode deactivation and to propose strategies to lessen the extent of this deactivation. …
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Synthesis and Characterization of Polymer Composite Materials For Lithium Battery Cathodes and Capacitors
… the synthesis and characterization of polymer composite materials used in lithium primary batteries and capacitors. The objective of the first part of the dissertation is to develop cathode materials based on silver vanadium oxide (SVO) coated with polypyrrole (PPy) having lower …
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Three dimensional characterization of failure evolution of tin and silicon in lithium ion battery electrodes
… serve as potential replacements to graphite in composite battery electrodes because of their higher gravimetric capacity when reacted with lithium, thus providing higher energy and power. Sn has a theoretical capacity of 994 mAh/g, which is three times that of graphite, while Si possesses over …
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Tailoring the electrochemical properties of catholytes for solid-state sodium batteries
… resulting from inactive components within the composite electrodes. This dissertation investigates the electrochemical properties of solid electrolytes functioning as catholytes in ASSBs and establishes fundamental design principles for achieving high ionic conductivity, interfacial stability, …
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Molecular design of precise ionic polymer networks for fundamental structure-property-relationships and energy-related applications
… with single-wall carbon nanotube (SWCNT) electrodes, a dopant-free soft actuator was fabricated with bending strain (0.9%) comparable to current state-of-the-art small molecule doped systems. Compared to the traditional salt solution doped ionic polymer-metal composite actuator, prolonged …
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Operando investigations of mechanical changes in lithium-ion batteries
… lithiation and delithiation, degradation of the electrodes, decomposition of the electrolyte, and external cell pressure. The work presented here seeks to describe and understand the interplay between electrochemical cycling and mechanical changes within Li-ion cathodes. Stress, Strain, and …
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Fully Aerosol-Jet Printed Trilayer Electrochemical Actuator
… difficult due to the need to pattern and align electrodes on both sides of the polymer electrolyte while avoiding short circuits between adjacent and opposing electrodes. Existing photolithography-based methods also face challenges in maintaining pattern integrity during the development process, …
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