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Showing 1 to 19 of 19 for “"iridium oxide"”.
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Sputter deposition of Iridium and Iridium Oxide for stimulation electrode coatings
… is excited by the activation of one electrode. Iridium and iridium oxide (Ir and IrOx) are used as thin film coatings of stimulation electrodes. Charge transfer is accomplished by means of redox reactions. The goal of the work was to determine and develop the processes and underlying effects …
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Iridium oxide supported on graphitized carbon for use as reversal tolerant anodes in pem fuel cells
… that among the noble metal electrocatalysts, iridium (Ir) in its oxide form is among the highest for OER activity in acidic media. McCrory et al., (2013) also found that of all their tested metal oxide systems, IrOx was the most stable in acidic solutions. IrOx is an efficient catalyst for the …
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Iridium oxide supported on antimony-doped tin oxide as an electrocatalyst for the oxygen evolution reaction
… oxygen evolution reaction (OER). While both iridium and ruthenium oxides are state-of-the-art OER catalysts in acidic environment, the latter undergoes dissolution under anodic OER conditions much more rapidly than the former, and this makes iridium oxide the most suitable catalytic material …
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Correlative ex-situ analysis and operando ellipsometric investigation during oxygen evolution reaction of mesoporous iridium oxide model catalysts
… studies of a calcination series of mesoporous iridium oxide films (300 °C – 600 °C) was developed and validated in terms of film thickness and porosity as well as electrical and electronic properties using various ex-situ characterization methods such as scanning electron microscopy (SEM), …
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Work Function Study of Iridium Oxide and Molybdenum Using UPS and Simultaneous Fowler-Nordheim I-V Plots with Field Emission Energy Distributions
… and field emission stability for molybdenum and iridium oxide coatings was examined. Single emission tips and flat samples of molybdenum and iridium oxide were prepared for characterization. The flat samples were characterized using X-ray Photoelectron Spectroscopy and X-ray diffraction to …
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Impedance spectroscopy for cellular and biomolecular analysis
… are described and characterised. These are iridium oxide and PPy/PSS (polypyrrole/poly(styrenesulphonate)). Impedance data is analysed in terms of equivalent circuit models. The findings presented suggest that iridium oxide and PPy/PSS could be used as alternative materials to platinum black …
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Studies in process analysis and control in batch reactors
… and disadvantages of the use of thermally grown iridium-oxide electrodes are introduced. Their response was compared to that of standard glass electrodes and found to be faster, more stable at high temperatures and no alkaline error was observed. However, the problem of drift of the signals was …
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Studying the glial cell response to biomaterials and surface topography for improving the neural electrode interface
… electrodes. This lead to pursuing studies with iridium oxide and platinum alloy wires for the glial scar assay. Iridium oxide advantages of lower impedance and higher charge injection capacity would appear to make iridium oxide more favorable for neural electrode fabrication. However, results of …
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Topological Phases in Perovskite Iridates with Strong Spin-Orbit Coupling
… matter physics. The Iridates, which are Iridium-based compounds, have already shown rich physical phenomena and can be a perfect platform to reveal topological phases in materials with strong spin-orbit coupling. This thesis focuses on possible exotic topological phases that stem from the …
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Fabrication, characterisation, and optical applications of electrochemically deposited nanostructured IrOx films
In this work, nanostructured iridium oxide films were fabricated by electrochemical deposition within a template made with polystyrene spheres on gold substrates. SEM pictures show that the nanostructured IrOx films have a very ordered hexagonal structure. To our knowledge, this is the first report …
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Extracellular stimulation of individual electrogenic cells with micro-scaled electrodes
… recordings. Microelectrodes with sputtered iridium oxide films (SIROFs) for improved stimulation capabilities were developed in an iterative process. With low impedance and high charge storage capacity, the rough and porous SIROF electrodes showed electrochemical properties superior to …
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Nanostructures templated on biological scaffolds for light harvesting, energy transfer, charge transfer, and redox reactions
… organisms, which suffer from instability. Metal oxide catalysts, often coupled with pigments, are similar to the reaction centers in natural photosystems and have been shown to photochemically oxidize water. Unfortunately, various approaches involving molecular design of ligands, surface …
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Materials and designs for 3D conformal electronics with capabilities in cardiac mapping and stimulation
… silicon nanomembranes for strain gauges, iridium oxide for pH sensors, gallium nitride and gallium arsenide for optoelectronics, metal thin films for temperature sensing, and nanotextured electrode coatings for characterizing electrical activities. Careful mechanical design and fractal …
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In vitro feasibility testing of floating light-activated minroelectrical stimulators
… injection capacity of titanium nitride (TiN) and iridium oxide (IrOx) as potential contact materials, and measure the transmitted light power through the neural tissue for various implantation depths. The charge injection capacity of TiN electrodes for an extended range of cathodic voltages was …
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Trends in C-H bond dehydrogenation energetics for small molecule conversion
… methanol, methane, and propane with oxide surfaces to reveal trends in adsorption energies, product selectivity, and reaction rates. We achieve this by developing suitable design descriptors by studying the reaction mechanism in situ. We first generated a library of manganese oxide …
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Design of active, stable, and earth-abundant acidic oxygen evolution catalysts
… earth-abundant elements from cobalt and nickel oxides operate in neutral and alkaline pH. These same systems corrode under acidic conditions, which is a regime important for electrolyzers and photoelectrochemical devices as well as for fundamental mechanistic studies. In this thesis, we …
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Biologically inspired materials for electro-responsive coatings and the photo-oxidation of water
… that bind to electrode materials and metal oxides. As in nature, it is observed that the context of a particular peptide dramatically influences its properties. While a peptide sequence may exhibit good adhesion to a particular surface when displayed on yeast, the same peptide may have …
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GREEN ENERGY VIA ELECTROCHEMICAL PROCESSES (GEEP)
… correlation to the PEMWE topic. Electrodeposited Iridium oxide film is characterized by Electrochemical Impedance Spectroscopy, to obtain the proton diffusion coefficient at different overpotential near to the OER. With the aim of verify which is the difference in term of proton diffusion …
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A study of the oxygen electrochemistry of ruthenium and iridium
… of the anodic behaviour of ruthenium and iridium in aqueous solution and particularly of oxygen evolution on these metals. The latter process is of major interest in the large-scale production of hydrogen gas by the electrolysis of water. The presence of low levels of ruthenium trichloride …