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Auswahl der wissenschaftlichen Literatur zum Thema „Nanostrucred composites electrodes“
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Zeitschriftenartikel zum Thema "Nanostrucred composites electrodes"
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Li, Geng. „Electrochemical Sensor under Nanostructured Materials“. Key Engineering Materials 852 (Juli 2020): 70–79. http://dx.doi.org/10.4028/www.scientific.net/kem.852.70.
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In order to study the electrochemical sensor of nanometer mechanism materials to realize the high sensitive detection of different chemical molecules, in this research, the preparation methods of molybdenum dioxide nanomaterials, molybdenum dioxide/metal particles (Au, Pt, Au@Pt) composites and the preparation of molybdenum dioxide nanomaterials, molybdenum dioxide /Au composite nanomaterials, molybdenum dioxide /Pt composite nanomaterials and molybdenum dioxide /Au @Pt composite nanomaterials were introduced. Then the electrochemical behavior of several modified electrodes, electrochemical behavior in catechol system, scanning and pH were applied to the modified electrode. Finally, the electrode p-catechol system was detected by differential pulse voltammetry and the actual samples were analyzed. The results showed that compared with unmodified electrode materials, the electrode modified by molybdenum dioxide nanomaterials, molybdenum dioxide /Au composite nanomaterials, molybdenum dioxide /Pt composite nanomaterials and molybdenum dioxide /Au @Pt composite nanomaterials has better electrocatalytic performance and the detection of catechol has a good effect. Among them, the electrochemical sensor constructed by MoS2-Au@Pt composite has the best detection performance for catechol. The results have a good guiding significance for the performance improvement of electrochemical sensor.
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Song, Yu, Mingyue Zhang, Tianyu Liu, Tianjiao Li, Di Guo und Xiao-Xia Liu. „Cobalt-Containing Nanoporous Nitrogen-Doped Carbon Nanocuboids from Zeolite Imidazole Frameworks for Supercapacitors“. Nanomaterials 9, Nr. 8 (02.08.2019): 1110. http://dx.doi.org/10.3390/nano9081110.
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Pyrolyzing metal–organic frameworks (MOFs) typically yield composites consisting of metal/metal oxide nanoparticles finely dispersed on carbon matrices. The blend of pseudocapacitive metal oxides and conductive metals, as well as highly porous carbon networks, offer unique opportunities to obtain supercapacitor electrodes with mutually high capacitances and excellent rate capabilities. Herein, we demonstrate nitrogen-doped carbon nanocuboid arrays grown on carbon fibers and incorporating cobalt metal and cobalt metal oxides. This composite was synthesized via pyrolysis of a chemical bath deposited MOF, cobalt-containing zeolite imidazole framework (Co–ZIF). The active materials for charge storage are the cobalt oxide and nitrogen-doped carbon. Additionally, the Co metal and the nanoporous carbon network facilitated electron transport and the rich nanopores in each nanocuboid shortened ion diffusion distance. Benefited from these merits, our Co–ZIF-derived electrode delivered an areal capacitance of 1177 mF cm−2 and excellent cycling stability of ~94% capacitance retained after 20,000 continuous charge–discharge cycles. An asymmetric supercapacitor prototype having the Co–ZIF-derived hybrid material (positive electrode) and activated carbon (negative electrode) achieved a maximal volumetric energy density of 1.32 mWh cm−3 and the highest volumetric power density of 376 mW cm−3. This work highlights the promise of metal–metal oxide–carbon nanostructured composites as electrodes in electrochemical energy storage devices.
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Veldevi, T., K. Thileep Kumar, R. A. Kalaivani, S. Raghu und A. M. Shanmugharaj. „Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance“. Asian Journal of Chemistry 31, Nr. 8 (28.06.2019): 1709–18. http://dx.doi.org/10.14233/ajchem.2019.21924.
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Hierarchical nanostructured graphene–manganese dioxide nanowire (G-MnO2-NW) composites have been prepared by hydrothermal synthesis route using water/1-decanol as the medium. Synthesized materials were analyzed using various characterization tools to corroborate their chemical compositions, structure/morphology and surface area. Electrochemical measurements of the synthesized G-MnO2-NW electrode materials delivered the highest specific capacity (255 Fg-1), high rate capability and improved cycling stability at 0.5 Ag–1 in 1M sodium sulfate solution and this fact may be attributed to its high surface area and porosity. Moreover, synthesized G-MnO2-NW electrodes displayed better energy and power density, when compared to the MnO2-NW based electrodes.
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Kalinina, Elena, und Elena Pikalova. „Opportunities, Challenges and Prospects for Electrodeposition of Thin-Film Functional Layers in Solid Oxide Fuel Cell Technology“. Materials 14, Nr. 19 (26.09.2021): 5584. http://dx.doi.org/10.3390/ma14195584.
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Electrolytic deposition (ELD) and electrophoretic deposition (EPD) are relevant methods for creating functional layers of solid oxide fuel cells (SOFCs). This review discusses challenges, new findings and prospects for the implementation of these methods, with the main emphasis placed on the use of the ELD method. Topical issues concerning the formation of highly active SOFC electrodes using ELD, namely, the electrochemical introduction of metal cations into a porous electrode backbone, the formation of composite electrodes, and the electrochemical synthesis of perovskite-like electrode materials are considered. The review presents examples of the ELD formation of the composite electrodes based on porous platinum and silver, which retain high catalytic activity when used in the low-temperature range (400–650 °C). The features of the ELD/EPD co-deposition in the creation of nanostructured electrode layers comprising metal cations, ceramic nanoparticles, and carbon nanotubes, and the use of EPD to create oriented structures are also discussed. A separate subsection is devoted to the electrodeposition of CeO2-based film structures for barrier, protective and catalytic layers using cathodic and anodic ELD, as well as to the main research directions associated with the deposition of the SOFC electrolyte layers using the EPD method.
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Kulandaivalu, Shalini, und Yusran Sulaiman. „Recent Advances in Layer-by-Layer Assembled Conducting Polymer Based Composites for Supercapacitors“. Energies 12, Nr. 11 (01.06.2019): 2107. http://dx.doi.org/10.3390/en12112107.
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Development of well-designed electrodes is the key to achieve high performance supercapacitors. Therefore, as one of the effective methods, a layer-by-layer (LBL) approach is often fruitfully employed for the fabrication of electrode material. Benefiting from a tunable parameter of the LBL approach, this approach has paved a way to design a highly ordered nanostructured electrode material with excellent performance. Conducting polymers (CPs) are the frontrunners in supercapacitors and notably, the LBL assembly of CPs is attracting extensive attention. Therefore, this critical review covers a comprehensive discussion on the research progress of CP-based composites with special importance on the LBL approach predominately for supercapacitors. Following a brief discussion on supercapacitors and CPs, the most up-to-date techniques used in LBL are highlighted.
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Milikic, Jadranka, Nevena Markicevic, Aleksandar Jovic, Radmila Hercigonja und Biljana Sljukic. „Glass-like carbon, pyrolytic graphite or nanostructured carbon for electrochemical sensing of bismuth ion?“ Processing and Application of Ceramics 10, Nr. 2 (2016): 87–95. http://dx.doi.org/10.2298/pac1602087m.
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Different carbon electrodes were explored for application in electroanalysis, namely for sensing of bismuth ion as model analyte. Carbon materials tested included glassy carbon, basal and edge plane pyrolytic graphite, as well as nanostructured carbonized polyaniline prepared in the presence of 3,5-dinitrosalicylic acid. Bismuth ion was chosen as model analyte as protocol for its detection and quantifications is still to be determined. Herein, anodic stripping voltammetry was used with study of effect of several parameters such as scan rate and deposition time. Electrode based on carbonized polyaniline showed the highest activity for bismuth ion sensing in terms of the highest current densities recorded both in a laboratory and in real sample, while basal plane pyrolytic graphite electrode gave the lowest limit of detection.
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Al-Ahmed, Amir. „Electrode Modification for Better Kinetics in all Vanadium Redox Flow Battery (AVRFB): A Short Review“. Advanced Materials Research 1116 (Juli 2015): 229–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1116.229.
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One critical component in a vanadium redox flow battery (VRFB) system is its electrode. The redox reactions between V+2/V+3 and V+4/V+5 take place on electrodes surfaces. Commonly used electrode material is the graphite felts (GFs); this material has good chemical and electrochemical stabilities, conductivity, and suitable surface area, with low price tag. However, its relatively poor kinetics and electrochemical activity often limit the VRFB operation at low current density. Many researchers have attempted to enhance VRFB performance by trying other carbon materials such as, carbon nanotubes, graphene, and composite materials. They also deposited noble metals on to these electrodes as catalysts, which are not very practical due to their high cost and susceptibility to hydrogen/oxygen evolution reactions. Low-cost metal oxides, such as Mn3O4, CeO2 and WO3 were also been explored as catalysts, but their performance is limited by their low conductivity and stability in concentrated sulfuric acid. Significant improvement in electrode performance are reported when different nanostructured metal catalysts were deposited. However, the performance of modified electrodes also depends on the size and uniform distribution of these nanoparticles. In this article, some important developments of this area are reviewed.
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Ho, Mui Yen, Poi Sim Khiew, Dino Isa und Wee Siong Chiu. „Electrochemical studies on nanometal oxide-activated carbon composite electrodes for aqueous supercapacitors“. Functional Materials Letters 07, Nr. 06 (Dezember 2014): 1440012. http://dx.doi.org/10.1142/s1793604714400128.
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In present study, the electrochemical performance of eco-friendly and cost-effective titanium oxide ( TiO 2)-based and zinc oxide-based nanocomposite electrodes were studied in neutral aqueous Na 2 SO 3 electrolyte, respectively. The electrochemical properties of these composite electrodes were studied using cyclic voltammetry (CV), galvanostatic charge–discharge (CD) and electrochemical impedance spectroscopy (EIS). The experimental results reveal that these two nanocomposite electrodes achieve the highest specific capacitance at fairly low oxide loading onto activated carbon (AC) electrodes, respectively. Considerable enhancement of the electrochemical properties of TiO 2/AC and ZnO /AC nanocomposite electrodes is achieved via synergistic effects contributed from the nanostructured metal oxides and the high surface area mesoporous AC. Cations and anions from metal oxides and aqueous electrolyte such as Ti 4+, Zn 2+, Na + and [Formula: see text] can occupy some pores within the high-surface-area AC electrodes, forming the electric double layer at the electrode–electrolyte interface. Additionally, both TiO 2 and ZnO nanoparticles can provide favourable surface adsorption sites for [Formula: see text] anions which subsequently facilitate the faradaic processes for pseudocapacitive effect. These two systems provide the low cost material electrodes and the low environmental impact electrolyte which offer the increased charge storage without compromising charge storage kinetics.
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Kwon, Nam, Divine Mouck-Makanda und Katharina Fromm. „A Review: Carbon Additives in LiMnPO4- and LiCoO2-Based Cathode Composites for Lithium Ion Batteries“. Batteries 4, Nr. 4 (15.10.2018): 50. http://dx.doi.org/10.3390/batteries4040050.
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Carbon plays a critical role in improving the electronic conductivity of cathodes in lithium ion batteries. Particularly, the characteristics of carbon and its composite with electrode material strongly affect battery properties, governed by electron as well as Li+ ion transport. We have reviewed here various types of carbon materials and organic carbon sources in the production of conductive composites of nano-LiMnPO4 and LiCoO2. Various processes of making these composites with carbon or organic carbon sources and their characterization have been reviewed. Finally, the type and amount of carbon and the preparation methods of composites are summarized along with their battery performances and cathode materials. Among the different processes of making a composite, ball milling provided the benefit of dense and homogeneous nanostructured composites, leading to higher tap-density and thus increasing the volumetric energy densities of cathodes.
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Sehrawat, Poonam, Abid Abid, Saikh S. Islam, Alain Mauger und Christian M. Julien. „Nanostructured Graphene Oxide-Based Hybrids as Anodes for Lithium-Ion Batteries“. C 6, Nr. 4 (16.12.2020): 81. http://dx.doi.org/10.3390/c6040081.
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Presently, the negative electrodes of lithium-ion batteries (LIBs) are constituted by carbon-based materials, which exhibit a limited specific capacity 372 mAh g−1 associated with the cycle in the composition between C and LiC6. Therefore, many efforts are currently made towards the technological development of nanostructured graphene materials because of their extraordinary mechanical, electrical, and electrochemical properties. Recent progress on advanced hybrids based on graphene oxide (GO) and reduced graphene oxide (rGO) has demonstrated the synergistic effects between graphene and an electroactive material (silicon, germanium, metal oxides (MOx)) as electrode for electrochemical devices. In this review, attention is focused on advanced materials based on GO and rGO and their composites used as anode materials for lithium-ion batteries.
Dissertationen zum Thema "Nanostrucred composites electrodes"
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Rogier, Clémence. „Vers le développement d’un pseudocondensateur asymétrique avec des électrodes composites à base d’oxydes métalliques (MnO2, MoO3) et de carbones nanostructurés“. Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1098.
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Les supercondensateurs sont des systèmes de stockage de l’énergie destinés à des applications de nécessitant de fortes densité de puissance. Leur densité d’énergie peut être augmentée en développant de nouveaux matériaux d’électrode à forte capacitance. Dans cet objectif ces travaux décrivent le développement de matériaux composites à base de carbones nanostructurés (architectures avec des nanotubes de carbones et/ou de graphène oxydé réduit) et d’oxydes métalliques pseudocapacitifs (MnO2 et MoO3 pour les électrodes positive et négative respectivement). Les oxydes métalliques permettent de générer de fortes capacitances grâce à des réactions redox réversibles sur une large gamme de potentiels. La matrice carbonée nanostructurée induit une porosité et une conductivité des électrodes optimisées et assure le transport des ions et des électrons au sein des matériaux.L’électrode positive MnO2-rGO-CNTs est développée par pulvérisation des nanomatériaux carbonés directement sur le collecteur de courant avec un spray dynamique robotisé puis par croissance électrochimique de l’oxyde. Sa capacitance maximale est de 265 F/g. Dans une approche similaire, l’électrode négative MoO3-CNTs est développée, avec une capacitance maximale de 274 F/g. Les matériaux d’électrodes sont caractérisés par différentes techniques physicochimiques (microscopies, analyses de porosité, DRX, spectroscopies).Ces électrodes sont ensuite associées au sein d’un pseudocondensateur hybride asymétrique utilisant un électrolyte organique (LiTFSI/GBL) avec une tension de fonctionnement de 2V. Les performances de ce système en termes de densités d’énergie et de puissance ainsi que de stabilité électrochimique sont étudiées sur plusieurs milliers de cycles. La densité d’énergie maximale est calculée à 25 Wh/kg pour une densité de puissance de 0,1 kW/kgSupercapacitors are energy storage devices for applications requiring high power densities. By developing new electrode materials with high capacitance energy densities can be enhanced. In that regard this work presents the development of composites materials associating nanostructured carbons (architectures with carbon nanotubes and/or reduced graphene oxide) and pseudocapacitive metal oxides (MnO2 and MoO3 for positive and negative electrodes respectively). Metal oxides generate high capacitances thanks to reversible redox reactions in a wide range of potentials. The nanostructured carbon matrix optimizes porosity and conductivity of the electrodes to ensure good ionic and electronic transport within the materials.First MnO2-rGO-CNTs is developed as a positive electrode using spray gun deposition of carbon nanomaterials before electrochemical growth of the oxide. The interest of these elaboration techniques lies in their easy large-scale implementation. Its maximum capacitance is measured at 265 F/g. In a similar approach MoO3-CNTs is developed as a negative electrode with a maximum capacitance of 274 F/g. The materials are characterized using different physicochemical methods (microscopy, spectroscopy, porosity analysis, XRD).These electrodes are then combined in an asymmetric hybrid pseudocapacitor in an organic electrolyte (LiTFSI/GBL) with an operating voltage window of 2V. The performances of this system in terms of energy and power densities as well as electrochemical stability were studied over several thousand cycles. The maximum energy density was found to be of 25 Wh/kg for a power density of 0.1 kW/kg
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Johns, Phillip A. „Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery“. Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/206161/.
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The factors effecting 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 the rate limitation that occurs in the composite electrode structure due to electrolyte concentration, electrode thickness and lithium ion transference number. The conformal electrodeposition of cathode materials onto 3D current collectors has been achieved with good control of film thickness. The advantage of the 3D current collector configuration over a conventional thin film arrangement has been realised by a 250 times capacity increase for a given footprint area. It was suggested the observed rate performance of half-cell 3D microbatteries, based on a manganese dioxide cathode and a lithium foil anode, was limited by the lithium ion transport distance through the porous 3D structure. The electrodeposition of conformal polymers layers onto 3D substrates was investigated. The use of electrodeposited, electrolyte swollen, poly(acrylonitrile) and poly(aniline) films as polymer electrolytes was demonstrated. A novel method for the determination and differentiation of electronic and ionic resistance in electrodeposited polymer layers has been developed. A ‘working’ cell based on consecutively electrodeposited cathode and polymer electrolyte layers and a ‘soft contact’ liquid anode was presented
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Thaury, Claire. „Optimisation de matériaux composites Si/Intermétallique/Al/C utilisés comme électrode négative dans des accumulateurs Li-ion“. Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1068/document.
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Ce mémoire est consacré à l'étude de matériaux composites innovants du type Si/Intermétallique/Al/C utilisés comme matériaux d'électrodes négatives pour les batteries lithium ion. L'objectif de ces travaux est d'optimiser un matériau de composition 20Ni-48Sn-20Si-3Al-9C ayant été développé auparavant pour obtenir les meilleures performances électrochimiques. Ce matériau se présente sous la forme de nanoparticules de silicium enrobées par une matrice submicrométrique. Plusieurs stratégies ont été mises en œuvre : optimisation des teneurs en carbone et en silicium, influence de l'état de surface du silicium sur les propriétés électrochimiques et remplacement de l'intermétallique Ni3+xSn4 par d'autres alliages : un composé zinc-aluminium Al0, 23Zn0,77 et deux intermétalliques Cu6Sn5 et CoSn. Les composés intermétalliques ont été synthétisés par métallurgie des poudres et les matériaux composites par mécanosynthèse. Les propriétés chimiques et structurales de ces matériaux ont été déterminées par microsonde de Castaing, diffraction des rayons X et microscopies électroniques. Les caractérisations électrochimiques ont été réalisées en demi-cellules (Swagelok et bouton) par cyclage galvanostatique et par voltamétrie cyclique. Ce mémoire détaille l'influence des paramètres étudiés sur les propriétés structurales. Une large étude a notamment été menée sur l'influence des teneurs en carbone et en silicium sur l'obtention d'une matrice homogène, une condition nécessaire pour atteindre de bonnes performances électrochimiques. Le même type d'étude a été mené sur l'influence de l'effet de surface du Si et la nature de l'alliage utilisé. Il a par exemple été montré de meilleurs résultats électrochimiques pour les intermétalliques présentant une réactivité modérée avec le silicium lors du broyage mécanique. Les meilleures performances ont été obtenues pour la composition Ni0.13Sn0.15Si0.26Al0.04C0.42. Ce composite présente une capacité de 650 mAh.g-1 pendant 1000 cycles. L'utilisation d'un silicium carboné en surface améliore la stabilité en cyclage de la SEI même si son utilisation reste à optimiserThis study focuses on the optimization of innovative composite materials Si/Intermetallic/Al/C used as negative electrode in lithium-ion batteries. The aim of this work is optimization of the composition for the material (20Ni-48Sn-20Si-3Al-9C) to improve its electrochemical performances. All materials are made up of silicon nanoparticles embedded in a sub micrometrical matrix. Several issues have been studied in this essay: optimization of the silicon and carbon contents, influence of the silicon surface composition, and substitution of the former intermetallic Ni3+xSn4 by other ones: zinc aluminium compound Al0,23Zn0,77 and two intermetallics Cu6Sn5 et CoSn. Metallic compounds and composites have been synthesised by powder metallurgy and mechanical alloying, respectively. Their chemical and structural properties have been determined by electron probe microanalysis, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Electrochemical characterisations have been carried out by galvanostatic cycling and cyclic voltammetry in coin and Swagelok half cells. This report details the influence of the studied parameters on the structural properties of the composite materials. A large study was devoted to the influence of carbon and silicon contents on the achievement of a homogeneous matrix, which is mandatory to get good electrochemical performances. Influence of the composition of silicon surface and intermetallic on the microstructure and electrochemical properties of the composites was also studied. Thus, we have shown that intermetallics reacting moderately with Si during mechanical alloying have better electrochemical properties. The best electrochemical properties have been obtained for the nominal composition Ni0.13Sn0.15Si0.26Al0.04C0.42. This material provides a reversible capacity of 650 mAh.g-1 during 1000 cycles. The use of carbon coated silicon improves the stability of the SEI during cycling even if this composite still has to be optimized
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Edfouf, Zineb. „Étude de nouveaux matériaux composites de type Si/Sn Ni/Al/C pour électrode négative de batteries lithium ion“. Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00673220.
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Ce mémoire est consacré à l'étude de nouveaux matériaux composites de type Si/Sn-Ni/Al/C pour former des électrodes négatives de batteries lithium ion. La microstructure de ces matériaux se présente sous la forme de nanoparticules de Si enrobées dans une matrice conductrice constituée de carbone et d'un composé intermétallique Ni3,4Sn4. La nanostructure et la composition du matériau composite lui confèrent de très bonnes performances en termes de capacité réversible, de stabilité électrochimique, et de cinétique de réaction. La mécanosynthèse a été choisie comme méthode d'élaboration. Les propriétés structurales et chimiques du composite ont été déterminées par analyses DRX, par microscopies électroniques MET et MEB, par analyses EDX et EFTEM et par spectroscopie Mössbauer de 119Sn. La caractérisation électrochimique a été réalisée par cyclage galvanostatique et par voltamétrie cyclique. La réactivité de ces matériaux envers le lithium a été étudiée par analyses DRX et spectroscopie Mössbauer de 119Sn in-situ. Ce mémoire détaille les résultats structuraux et électrochimiques obtenus pour différents matériaux composites basés sur Ni3,4Sn4 en ajoutant les éléments C, Al et Si. Une étude des mécanismes réactionnels lors du broyage mécanique ainsi que pendant le cyclage électrochimique a été effectuée et le rôle des différents éléments a été mis en évidence. Enfin, une discussion sur l'influence de la microstructure sur les performances électrochimiques des matériaux composites est donnée. Les meilleures performances électrochimiques sont obtenues pour le composite de composition nominale Ni0,14Sn0,17Si0,32Al0,04C0,35. Il présente une capacité réversible de 920 mAh/g avec une très bonne stabilité sur 280 cycles. Le matériau possède une excellente cinétique de délithiation : 90% de la capacité peut être délivrée en moins de 5 minutes. La capacité irréversible (20%) reste toutefois élevée et doit être encore améliorée en stabilisant l'interface solide/électrolyte (SEI)
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Fu, Yan-Hao, und 傅彥澔. „Electrochemical Behavior of Nanostructured Graphene/Manganese Oxide Composite Electrodes Prepared by Electrophoretic Deposition“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74765360594860862392.
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碩士國立高雄應用科技大學
化學工程與材料工程系博碩士班
101
In this study, VGCF (vapor grown carbon fiber) and MCMB (mesocarbon microbeads) were used as raw materials to synthesize the graphene oxide (GO) powder for supercapacitor applications. The porous graphene oxide electrodes were prepared by electrophoretic deposition (EPD). The effects of porous structure and surface area on the capacitive behavior were systematically investigated. X-ray diffraction analysis and transmission electron microscopy observation reveal that the spacing of the graphite layer was increased after chemical oxidation treatment. The specific surface area of synthesized GO powder measured by BET (Brunauer-Emmett-Teller) analyzer was significantly increased compared to that of raw materials. The electrodes were heat-treated at 300℃ in air for 1 h before the electrochemical measurements. Cyclic voltammetry (CV) test was carried out in 1 M Na2SO4 electrolyte solution to diagnose the reversibility of the electrodes. Galvanostatic charge and discharge tests were used to evaluate the specific capacitance value and the cycle-life stability of the electrodes. The results showed that at a discharge current density of 1 A g-1, the specific capacitance values increase up to 88 F g-1 and 43 F g-1 for VGCF and MCMB after oxidation reaction, respectively. The improved capacitive behavior was attributed to the large graphite layer spacing, high specific surface area, and special electrode structure for facilitating the charge storage. GNR (graphene nanoribbon)/MnO2 composite film electrode (36 wt.% MnO2) was fabricated by EPD in the isopropanol solution containing GNR powder and 0.5 mM manganese nitrate. After heat treated at 300℃ for 1 h, the specific capacitance value of GNR/MnO2 electrode could reach as high as 266 F g-1 (discharged at a current density of 1 A g-1). The GNR/MnO2 electrode showed a stable cycle-life performance, the capacitance retention was about 98% after 3000 charge/discharge cycle tests. The improved capacitive behavior of the GNR/MnO2 electrode could be attributed to the manganese oxide nanoparticles that prevent the graphite layers from restacking and inhibit the exfoliation of active materials from the electrode surface. Therefore, the electrochemical properties of GNR/MnO2 composite film electrode were considerably improved.
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Chen, Yi Wen Wang Ben. „Nanotube and nanofiber buckypaper cold cathode illumination experimental investigation /“. 2006. http://etd.lib.fsu.edu/theses/available/etd-07102006-161808.
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Thesis (M.S.)--Florida State University, 2006.Advisor: Ben Wang, Florida State University, College of Engineering, Dept. of Industrial Engineering. Title and description from dissertation home page (viewed Sept. 22, 2006). Document formatted into pages; contains xii, 93 pages. Includes bibliographical references.
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Ou-Yang, Huei, und 歐陽暉. „Characterization of nanostructured iron oxide composite electrode as an anode material for high-capacity Li-ion batteries“. Thesis, 2009. http://ndltd.ncl.edu.tw/handle/20292566236248703085.
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碩士國立高雄應用科技大學
化學工程與材料工程系
97
In this study, the iron oxide (α-Fe2O3) active materials are synthesized by electrochemical deposition and chemical precipitation methods, respectively. In addition, the iron oxide was coated on the surface of carbon fiber (VGCF) to form α-Fe2O3/VGCF composite electrode as an anode material for high-capacity Li-ion batteries. In the first part, the iron oxide film and α-Fe2O3/VGCF composite electrodes are prepared by electrochemical deposition method. The effects of different deposition current densities (0.025 and 0.125 mA cm-2) on the material characteristics and electrochemical performances of iron oxide electrode are investigated. According to the SEM analysis, the iron oxide film deposited at low-current density (0.025 mA cm-2) is rod-like morphology and that deposited at high-current density (0.125 mA cm-2) is sheet-like morphology. During the first charge-discharge process, the reversible capacity of films deposited at 0.025 and 0.125 mA cm−2 are 1390 and 1275 mAh g-1, respectively; At 10 C rate, the reversible capacity are 803 and 797 mAh g-1, respectively. The synthesized anode materials have a higher capacity than the graphite material for lithium storage. The SEM and XRD results indicate that iron oxide films are uniformly coated on the surface of carbon fiber by means of electrochemical deposition process. Compared with iron oxide electrode (deposited at 0.125 mA cm-2), the reversible capacity of α-Fe2O3/VGCF composite electrodes are increased by 17.9 % in first charge-discharge process and 12 % at 10 C rate. The results show that carbon fiber can improve the electrochemical performance of the composite electrodes effectively. In the second part, the iron oxide powder is synthesized by chemical precipitation method and is deposited onto the stainless steel substrate by electrophoretic deposition to form iron oxide film and α-Fe2O3/VGCF composite electrodes. The effects of different precursors [Fe(NH4)2(SO4)2．6H2O and FeCl3．6H2O] on the material characteristics and electrochemical performances of the iron oxide electrode is investigated. According to the SEM analysis, when the precursors are Fe(NH4)2(SO4)2．6H2O and FeCl3．6H2O, the morphologies of resulting iron oxide powder are nanorod and nanoparticles, respectively. The TG-DTA and XRD results indicate that FeOOH is fully converted into α-Fe2O3 when the annealing temperature is elevated to 400℃. During the first charge-discharge process, the reversible capacity of films for Fe(NH4)2(SO4)2．6H2O and FeCl3．6H2O are 1390 and 1275 mAh g-1, respectively; At 10 C rate, the reversible capacity are 713 and 503 mAh g-1, respectively. Compared with iron oxide electrode [Fe(NH4)2(SO4)2．6H2O], the reversible capacity of α-Fe2O3/VGCF composite electrodes are increased by 16.2 % in first charge-discharge process and 11.8 % at 10 C rate.
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Libánský, Milan. „Testování nových elektrodových uspořádání pro monitorování elektrochemicky oxidovatelných biologicky aktivních organických látek“. Doctoral thesis, 2017. http://www.nusl.cz/ntk/nusl-354366.
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Submitted Ph.D. Thesis is focused on the electrochemical characterization and testing of recently developed working electrodes made from pure gold or graphitic carbon particles and electrochemical arrangements. These electrodes are suitable for large screening measurements of various organic compounds. The development of new sensitive voltammetric methods for determination of oxidisable biologically active organic compounds is another aim of this work. To verify its applicability, the array of carbon composite film electrodes integrated in measuring cell system was selected for the development of voltammetric methods for determination of homovanillic acid, vanillylmandelic acid, and indoxyl sulphate. These analytes, which belong to the group of biomarkers of human diseases, were selected for increasing interest in their determination in medical laboratories. Moreover, determination of indoxyl sulphate was coupled to its solid phase extraction from human urine prior to voltammetric determination. Obtained results were compared with measurements of standards with well-established carbon paste electrode. Sputtered (physical vapour deposition method) gold nanostructured film electrodes on treated PTFE substrates and gold nanostructured film electrodes modified with various functional groups on the...
Buchteile zum Thema "Nanostrucred composites electrodes"
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Kučinskis, Gints, Kaspars Kaprāns und Gunārs Bajārs. „Nanostructured materials and their thin films for Li-ion battery electrodes: synthesis, research and performance“. In Nanostructured Composite Materials for Energy Storage and Conversion: collection of articles, 101–23. Latvijas Universitātes Akadēmiskais apgāds, 2019. http://dx.doi.org/10.22364/ncmesc.05.
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2
Dindune, Antonija, Jānis Ronis, Dagnija Valdniece, Antanas Orliukas, Tomas Salkus und Vilma Venckute. „Synthesis and research of electrode and solid electrolyte materials for lithium ion batteries“. In Nanostructured Composite Materials for Energy Storage and Conversion: collection of articles, 25–53. Latvijas Universitātes Akadēmiskais apgāds, 2019. http://dx.doi.org/10.22364/ncmesc.02.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Nanostrucred composites electrodes"
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Liao, G. Y., S. Geier, T. Mahrholz, P. Wierach und M. Wiedemann. „Temperature Influence on Electrical Properties of Carbon Nanotubes Modified Solid Electrolyte-Based Structural Supercapacitor“. In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3908.
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In the present work, we report on structural supercapacitors which are based on NASICON-type solid electrolyte Li1.4Al0.4Ti1.6(PO4)3 (LATP). The nanostructured electrodes incorporate single-wall carbon nanotubes (SWCNTs) mixed with the LATP electrolyte. The complete energy storage devices are manufactured in a sandwich structure consisting of two nanostructured electrode layers which are separated by a pure LATP layer. The as-prepared specimens are embedded in composite materials with Airstone 880/886H epoxy resin as matrix. Their electrical properties are characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). At ambient temperature, the addition of 6.5 wt. % SWCNTs results in a distinct improvement by reducing the total resistance of the embedded devices and enhances the capacitance from 0.025 mF g−1 to 3.160 mF g−1 at a scan rate of 5 mV s−1. Electrical measurements of two types of specimens are then applied under different temperatures from ambient temperature to 80 °C. It is observed that the equivalent series resistance (ESR) of device with SWCNTs decreases greatly and capacitance increases comparing with the device without SWCNTs. As a conclusion, the structural supercapacitors acquire excellent performance through high efficient double layer effects realized by nanostructured electrode/electrolyte interphase (large surface electrode areas).
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Basheer, Rafil, und Nedal Abu-Thabit. „Nanostructured Conductive Composite Filter Electrodes for Water Sterealization by Application of Low Electrical Current“. In 1st International Electronic Conference on Materials. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecm-1-b015.
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3
Couderc, H., Y. Corlu, S. Savoie, M. Frechette und E. David. „Dielectric breakdown of an epoxy/quartz composite and a nanostructured epoxy/quartz/Montmorillonite composite. Influence of electrode geometry“. In 2011 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2011). IEEE, 2011. http://dx.doi.org/10.1109/ceidp.2011.6232760.
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Pint, Cary L. „Capillary Force Guided Nanomanufacturing of Composite Materials for Advanced Battery Applications“. In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71738.
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This paper introduces the use of capillary thermodynamics as a powerful nanomanufacturing tool, and its specific application to infiltrate sulfur into 3-D nanostructured electrodes for advanced lithium-sulfur and/or sodium-sulfur battery development. The capillary effect specifically targets nucleation from the equilibrium vapor pressure of bulk sulfur (gas phase) onto nanoscale surfaces (liquid phase). This leads to condensates that nucleate and grow uniformly over the surface leading to self-limited and conformal composite materials moderated by the chemical potential driving force between the nanoscale nuclei and the bulk sulfur. Our studies show highly consistent and repeatable sulfur loading exceeding 80 wt.% sulfur, fast kinetics that can lead to full infiltration in ∼ 10 minutes, and synergy with pre-formed carbon materials including carbon nanotube arrays, carbon nanotube foams and sponges, and microporous carbons with pore sizes ∼ 0.5 nm. This overcomes challenges of scaling to high areal capacity in lithium-sulfur and sodium-sulfur batteries, and our results emphasize the highest reported areal capacities for solid-processed cathodes to date (> 19 mAh/cm2). This paves the route to batteries with energy density > 500 Wh/kg with reliable manufacturing processes that simultaneously sustain low cost and high throughput.
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Chen, Chien-Yu, Wei-Kai Lee, Yi-Jiun Chen, Chun-Yang Lu, Hoang Yan Lin und Chung-Chih Wu. „Enhancing Optical Out-coupling of Organic Light-Emitting Devices with Nanostructured Composite Electrodes Consisting of Indium Tin Oxide Nanomesh and Conducting Polymer“. In Solid-State and Organic Lighting. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/soled.2015.dw3d.3.
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Raffaelle, R. P., B. Landi, T. Gennett, R. S. Morris, B. Dixon und P. Lamarre. „Fuel Cell Applications of Single Wall Carbon Nanotubes“. In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1708.
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Novel carbon materials with nanometer dimensions are of potentially significant importance for a number of advanced technological applications. Currently, considerable interest exists in the possible applications of single wall carbon nanotubes (SWNTs) to proton exchange membrane (PEM) fuel cells. Proposed uses include as anode materials in both hydrogen and direct methanol fuel cells, solid polymer electrolyte additives, active cathode materials and bipolar plate interconnects. One of the desirable attributes afforded by the use of SWNTs in fuel cell applications stems from a combination of their extremely high electrical conductivity and large aspect ratios which results in a low weight percent for the electrical percolation threshold. This conductivity combined with the outstanding catalytic surface area offered by these nanostructured materials makes them a potentially outstanding active material for PEM electrodes. In addition, the high thermal conductivity, enhanced mechanical properties and corrosion resistance of polymer-SWNT composites may play a large role in developing new fuel cell designs such as thin-film microelectronic fuel cells. We will review the current applications involving SWNTs in PEM fuel cells and report on the recent work in the Nanopower Research Lab at RIT and it partners on utilizing high purity SWNT’s in microelectronic fuel cells.
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Borca-Tasciuc, Theodorian. „Heat Conduction Across Nanoscale Interfaces and Nanomaterials for Thermal Management and Thermoelectric Energy Conversion“. In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31312.
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Nanoscale heat conduction plays a critical role in applications ranging from thermal management of nanodevices to nanostructured thermoelectric materials for solid state refrigeration and power generation. This lecture presents recent investigations in our group. The first part of the lecture demonstrates heat conduction across nanoscale interfaces formed between individual nanoscale heaters and the silicon substrate [1]. A systematic experimental study was performed of thermal transport from individual nanoscale heaters with widths ranging between 77nm-250nm to bulk silicon substrates in the temperature range of 80–300K. The effective substrate thermal conductivity was measured by joule heating thermometry. We report up to two orders of magnitude reductions in the measured effective thermal conductivity of the silicon substrate when the heater widths are smaller than the mean free path of the heat carriers in the substrate, as summarized in Fig. 1. The effective mean free path of the silicon substrate was extracted from the measurements and was found to be comparable with recent molecular dynamics simulations. A proof of concept demonstration of a novel Thermal Interface Material (TIM) is presented next. The high thermal conductivity TIM is based on a highly connected high thermal conductivity nanostructured filler network embedded in a polymer matrix where the contribution of filler-matrix interfaces to thermal resistance is minimized. It was found [2] that the thermal conductivity could be varied from ∼0.2 to 20 W/mK when the volume fraction of metallic nanoparticles was varied from 0–20%. For similar volume fractions and filler composition, microparticle based composites have two orders of magnitude lower thermal conductivities. SEM characterization and thermal transport modeling are employed to support the conclusion that morphological changes in the nano-TIM are responsible for the thermal conductivity reduction. Thermoelectric transport investigations are discussed for a novel class of highly scalable nanostructured bulk chalcogenides developed at Rensselaer Polytechnic Institute [3]. Un-optimized, single-component bulk assemblies of Bi2Te3 and Sb2Te3 single crystal nanoplates show large enhancements (25–60%) in the room temperature thermoelectric figure of merit compared with individual bulk counterparts (Table 1). Nanostructuring was found to lead to strong thermal conductivity reduction without significantly affecting the mobility of the charge carriers, as shown in Table 2. A scanning thermal microprobe technique developed for simultaneous thermal conductivity (κ) and Seebeck coefficient (α) measurements in thermoelectric films is also presented [4]. In this technique, an AC alternative current joule-heated V-shaped microwire that serves as heater, thermometer and voltage electrode, locally heats the thin film when contacted with the surface (Fig. 2). The κ is extracted from the average DC temperature rise thermal resistance of the microprobe and α from the DC Seebeck voltage measured between the probe and unheated regions of the film by modeling the heat transfer in the probe, sample and their contact area, and by calibrations with standard reference samples. Application of the technique on sulfur-doped porous Bi2Te3 and Bi2Se3 films reveals α = −105.4 and 1.96 μV/K, respectively, which are within 2% of the values obtained by independent measurements carried out using microfabricated test structures. The respective κ values are 0.36 and 0.52 W/mK, which are significantly lower than the bulk values due to film porosity, and are consistent with effective media theory. The dominance of air conduction at the probe-sample contact area determines the microscale spatial resolution of the technique and allows probing samples with rough surfaces. Non-contact mode measurement of thermal conductivity was also demonstrated and confirmed by independent characterization [5]. In non-contact mode the technique utilizes ballistic air conduction as the dominant heat transfer mechanism between the thermal probe and the sample and thus eliminates uncertainties due to solid contact and liquid meniscus conduction.
Berichte der Organisationen zum Thema "Nanostrucred composites electrodes"
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Meilin Liu, James Gole. Nanostructured Composite Electrodes for Lithium Batteries (Final Technical Report). US: Georgia Institute of Technology, Dezember 2006. http://dx.doi.org/10.2172/896312.
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