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Formation of a Single Pinhole on Self-Assembled Monolayer Modified Nanometer-Sized Gold Electrode and Its Electrochemical BehaviorsLakbub, Jude, Kady, Ismail, Sun, Peng 01 September 2011 (has links)
In this paper, a nanometer-sized gold electrode with an effective radius around several tens of nanometers has been modified with a monolayer of alkanethiols. There are pinholes in the monolayer, and the pinholes can be used as very small electrode. Our evaluation shows that it is possible to have only one pinhole on the monolayer covered electrode. The single pinhole electrode has been used to study the electrochemical behaviors of fast and slow electrochemical reactions. Our results show that the electrochemical response of a slow electrochemical reaction is not a Butler-Volmer response if the electrode is small enough.
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Études des phénomènes de mouillabilité et des cinétiques d’imprégnation des électrodes positives par l’électrolyte : application aux batteries Lithium-Ion / Study of wetting and impregnation phenomena of the positive electrodes by the electrolyte : application to Lithium-Ion batteriesLacassagne, Elodie 16 July 2014 (has links)
Le contact entre l'électrode et l'électrolyte est primordial pour le bon fonctionnement d'une batterie Lithium-Ion. L'imprégnation de l'électrode positive par un électrolyte liquide a toujours été considérée comme totale, cependant les phénomènes ne sont pas exactement connus. Ainsi, ces travaux s'intéressent à l'influence de la composition de l'électrode positive (matière active et agent conducteur) sur cette imprégnation. Après une première étude des propriétés conductrices, électrochimiques et morphologiques d'électrodes présentant des formulations plus ou moins éloignées des formulations industrielles, une méthode utilisant l'équation de Washburn a été développée afin d'étudier l'imprégnation des pores modélisés par un ensemble de tubes capillaires. L'utilisation de l'hexadecane, considéré comme un liquide parfaitement mouillant, a permis de déterminer la taille effective des pores indépendamment de l'électrolyte, et celle-ci a pu être comparée à des résultats obtenus grâce à la méthode de thermoporosimétrie. Puis, les régimes de Washburn obtenus lors de la diffusion de l'électrolyte ont mis en évidence les cinétiques d'ascension. Par la suite, la méthode de Washburn a été utilisée afin de caractériser les propriétés d'imprégnation d'électrodes élaborées avec un nouveau liant et selon un procédé innovant s'affranchissant de l'utilisation de solvant. L'utilisation d'un additif permettant la création de porosité d'une part, et la réticulation du liant d'autre part permettent d'obtenir une imprégnation de l'électrolyte comparable à celle observée pour les électrodes fabriquées par voie solvant / The contact between the electrode and the electrolyte is essential for a Lithium-Ion battery functioning. The impregnation of a positive electrode by the electrolyte has always been considered as total; however the phenomena are not exactly known. Thus, in this work, the influence of the positive electrode composition (active material, conductive agent and binder) on the impregnation has been investigated. After a first study focusing on the conductive, electrochemical and morphological properties of the electrodes, with different types of formulation, a method using Washburn equation has been developed in order to study the impregnation of the electrode’s pores, which were modeled as capillary tubes. With the use of hexadecane, considered as a perfectly wetting liquid, the effective pore size has been determined and then compared to the results given by the thermoporosimetry method. Then, the kinetics of ascension have been identified with the Washburn regimes obtained with the diffusion of the electrolyte in the cathodes. Afterwards, Washburn method has been used in order to characterize the impregnation properties of electrodes elaborated with an innovative process without solvent. Thanks to the use of an additive allowing the creation of porosity in one hand and the reticulation of the binder in the other hand, an impregnation of these new electrode by the electrolyte has been considered as comparable to the one observed for the cathodes made with solvent
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Fundamental Studies on Local Reactions in Bifunctional Air Electrodes / 二機能性空気極における局所反応に関する基礎的研究Ikezawa, Atsunori 26 March 2018 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21121号 / 工博第4485号 / 新制||工||1697(附属図書館) / 京都大学大学院工学研究科物質エネルギー化学専攻 / (主査)教授 安部 武志, 教授 阿部 竜, 教授 作花 哲夫 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
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Fabrication of Chemically Modified Nanometer-sized Gold Electrodes and Their Application in Electrocatalysis at Pt Nanoparticles.Lakbub, Jude 17 December 2011 (has links) (PDF)
Hydrogen evolution via proton reduction occurs at a high rate at the surface of Pt than at Au electrodes. Using cyclic voltammetry, chemically modified nanometer-sized Au electrodes, prepared by the Laser-Assisted Puller Method, were employed to examine current amplification by electrocalysis at Pt nanoparticles adsorbed on the modified Au electrode surfaces. The electrodes were modified with Self-Assembled Monolayers (SAMs) of cysteamine and soaked in Pt colloid solutions overnight. Monitoring the decrements of the characteristic steady-state catalytic current for proton reduction indicated that aggregates of Pt nanoparticles are adsorbed on the cysteamine monolayers and desorb from them particle by particle. The results also indicate that some particles are strongly attached to the modified electrode surface and do not deplete even after thorough rinsing.
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A Study of Reaction Sites in AC Electro-Slag Remelting / Reaction Sites in AC Electro-Slag RemeltingGhosh, Debabrata 09 1900 (has links)
<p> The dominant slag-metal reaction site in AC electro-slag
remelting (ESR) has been directly determined by estimating the rate of
sulphur transfer at the electrode tip/slag and metal pool/slag interfaces.
In this investigation, negligible sulphur transfer has been
assumed at the droplet/slag interface, and the basis for such assumption
is discussed. Using a 5.825" diameter mould and CaF2-CaO slags,
it has been established that the electrode tip/slag interface is the
dominant reaction site. Calculations indicate that the pool sulphur
is close to equilibrium with the slag. The importance of all six
reaction sites in AC ESR are discussed. The results indicate the
importance of the slag/atmosphere interface, especially when using slags
of low lime content. Conventonal overall sulphur balances have
been carried out and the results are in agreement with the rates
obtained at the different interfaces, thus indicating internal consistency
of the results. </p> / Thesis / Master of Engineering (MEngr)
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Investigating Novel Electrode Design Methodologies for Faster Slotting in Silicon Using Die Sink EDMKarim, Mahmud Anjir 21 July 2023 (has links)
No description available.
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Study of the oxygen reduction reaction on platinum with scanning electrochemical microscopy and rotating disk voltammetrySun, Xiaojing 15 December 2007 (has links)
The tip generation/substrate collection mode (TG/SC) of scanning electrochemical microscopy (SECM) was used to study the ORR reactivity on Pt catalysts in sulfuric acid solution. The SECM reactivity image and the photographic image of different single crystalline regions of the etched Pt electrode correlated well. The electron backscatter diffraction (EBSD) image of Pt confirmed the surface single crystalline orientation. The image resolution is improved by employing smaller tip-substrate distance. The kinetics of the ORR on Pt surface was also studied at -15 - 30 C by means of the rotating disk voltammetry techniques. The calculated Tafel slopes for 0.1 m and 0.9 m HClO4 changed with decreasing temperature, indicating lower kinetics at low temperature. Peroxide is produced at potentials below 0 V vs SCE.
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Self-Supporting Tin Oxide/ Graphene Electrode for Lithium Ion BatteriesGildea, Arthur N. January 2013 (has links)
No description available.
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Fluidized Cathodes for Flexible Lithium-Ion BatteriesForeman, Evan January 2017 (has links)
No description available.
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A VALIDATION OF A PROTOTYPE DRY ELECTRODE SYSTEM FOR ELECTROENCEPHALOGRAPHYMonnin, Jason 23 September 2011 (has links)
No description available.
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