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Showing 1 to 20 of 43 for “"MnO2"”.
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MnO2 Nanoscale Interface Modification
… composite. This work will explore ZnO and MnO2 as interface modifications for use on carbon fibers. When exposed to high temperatures, carbon fibers undergo fiber degradation, leading to the need for low-temperature hydrothermal processes. This work will develop and characterize a nanoscale …
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Synthesis and characterizations of nanostructured MnO2 electrodes for supercapacitors applications
… to develop highly efficient and yet effective MnO2 electrode materials for supercapacitors applications. Most attention had focussed on MnO2 as a candidate for pseudo-capacitor, due to the low cost of the raw material and the fact that manganese is more environmental friendly than any other …
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STUDIES OF 2D LAYERED MnO2 AND MoS2 FOR ANTIBACTERIAL AND ELECTROCHEMICAL APPLICATIONS
… properties of two layered materials, MoS2 and MnO2 for applications such as antibacterial, energy storage and water remediation. Two aspects of the materials were investigated. Firstly, the synthetic parameters were tuned to prepare material with different morphologies and then the effect of …
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Electrochemical properties of crystalline polymorphs of MnO2 in aluminum and zinc metal batteries
<p>The widespread use of non-renewable fossil fuels has led to societal problems like global warming and climate change. Electrochemical energy storage can enable the integration of renewable energy sources that are inherently intermittent (solar, wind, etc.) into the electric grid, though major …
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Superoxide-assisted solid-state synthesis of birnessite type MnO2 materials: physiochemical properties and electrochemical viability
<p>With the reliance on renewable energy resources expected to grow in the near future, the world looks towards advancing electrochemical energy systems that can be scaled up to meet such demands. These systems must adhere to being environmentally friendly, cost-effective, and safe. Abundant earth …
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Block Copolymer-derived Porous Polyimides and Carbon for High-Performance Energy Storage
… fast charging remains a challenge. Conventional MnO2 gravel cathodes suffer from low electrical conductivity and slow ion (de-)insertion, resulting in poor recharging performance. In this dissertation, porous carbon fiber (PCF) supported MnO2 (PCF@MnO2), comprising nanometer-thick MnO2 deposited …
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Synthesis and characterization of high-performance supercapacitor devices based on carbon/MnO2 composite and carbonized iron cations adsorbed onto polyaniline/nickel graphene foam
… foam (C-Fe/PANI/Ni-GF) and birnessite-type MnO2/carbon composite electrode materials were investigated for supercapacitor applications. The C-Fe/PANI/Ni-GF electrode material was directly synthesized on a current collector by pyrolysis of the iron-PANI mixture coated on nickel graphene foam …
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Sorptions- und Redoxprozesse von Arsen an oxidischen Oberflächen : experimentelle Untersuchungen
… wurden Batchversuche mit beiden Arsenspezies und MnO2 bzw. FeOOH unter definierten geochemischen Bedingungen (Probenzusammensetzung, pH-Wert, Sauerstoffeinfluss) durchgeführt. Durch den Einsatz von Elutionsmethoden sowie Feststoffuntersuchungen mit XANES konnte das Sorptions- und Redoxverhalten …
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… were established, both with and without MnO2, to evaluate the redox buffering capacity of MnO2 with view to mitigating the reductive dissolution of iron oxide. This approach aimed to improve the retention of dissolved reactive phosphorus (DRP) on the introduced iron oxide surfaces. It was …
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Nanoarchitectured Energy Storage Devices
… to fabricate highly ordered manganese dioxide (MnO2) nanopillars is introduced. The SNAP method that is further modified to develop carbon nanoarray electrodes is also discussed. Subsequently, a template-free method to develop high aspect ratio copper oxide nanowhiskers on copper substrate is …
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Colorimetric sensor array for identification of fungi & ultrasonic spray synthesis for supercapacitor materials
… is in the synthesis of manganese oxide (MnO2) microspheres. In this case, a mixed solution of potassium permanganate and hydrochloric acid was nebulized into micro-sized droplets, which were then carried by air flow through a furnace tube. Each micro-droplet serves as one micro-reactor …
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Coupling of Oxidation-Reduction Reactions of Chromium, Iron and Manganese: Implications for the Fate and Mobility of Chromium in Aquatic Environments
… of HA.</p><p>Building on previous knowledge of MnO2 as an oxidant for Cr-containing solids, we systematically evaluated the rates and products of the oxidation of Cr(III) in iron oxides by MnO2. We found that Cr(III) dissolution from CrxFe1-x(OH)3 greatly influenced the Cr(VI) production rates. …
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Engineering efficient desalination systems: Materials development and systems analysis in capacitive deionization
… and operational parameters. Firstly, faradaic MnO2 was deposited onto carbon aerogels via cyclic voltammetry (CV) and electroless deposition (ED) at varying deposition times. Deposition techniques and conditions were evaluated according to common CDI performance metrics. SEM imaging and XRD …
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Synthesis And In-Situ Charactorization Of Energy Storage Material
… area graphene with high intrinsic capacitance MnO2 to achieve a better energy performance without scarifying power performance. In this project we will design and fabricate integrated 1-D and 2-D composites at nanoscale for pseudocapacitive positive electrode in asymmetric aqueous …
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Manganese dioxide reduction kinetics by Geobacter sulfurreducens and associated biofilm morphology in a flow-through reactor
… a yield of 3.44x1010 ± 2.54x1010 cells/mmol MnO2 was calculated and a maximum specific growth rate of 0.02 1/hr was estimated. The half saturation constant was fit with the model and determined to be 0.04 mmol MnO2 for the low flow rate. When the experiment was conducted at higher flow rates, …
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Design of electrode for electrochemical energy storage and conversion devices using multiwall carbon nanotubes
… storage and conversion. Inorganic oxides such as MnO2 and RuO2 are incorporated to increase volumetric capacitance in LbLMWNT electrodes using electroless deposition and square wave pulse potential deposition methods. Preliminary results show that we can increase volumetric capacitance of LbLMWNT/ …
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METAL OXIDE-BASED NANOMATERIALS FOR LITHIUM-OXYGEN BATTERIES APPLICATION
… POROUS CO?MN?O NANOCUBES, HIERARCHICAL POROUS D-MNO2 NANOBOXES AND POROUS CO3O4 NANOBOXES HAVE BEEN DEVELOPED AND EMPLOYED AS THE CATHODE CATALYSTS FOR LI-O2 BATTERIES. THE SYNERGISTIC EFFECTS OF LARGE SPECIFIC SURFACE AREA, POROUS OR HOLLOW STRUCTURE, AND HIGH ELECTROCATALYTIC ACTIVITY OF THESE …
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Prototype development and techno-economic analysis of electrochemical energy storage systems
… of a new flow battery chemistry, namely, Zn-MnO2 semi-solid flow battery (SSFB) was evaluated for energy storage applications in the electric power sector. Despite the low energy capacity cost of Zn-MnO2 SSFB, stringent pumping requirements compared to an all-liquid flow battery may limit …
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Nanostructured Metal Oxide Coatings for Electrochemical Energy Conversion and Storage Electrodes
… electrodes. The morphology and quantity of MnO2 electrodeposits was controlled by adjusting the density of graphene foliates on a novel graphenated carbon nanotube (g-CNT) scaffold. This control enabled the nanocomposite supercapacitor electrode to reach a capacitance of 640 F/g, under MnO2 …
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Mangano oksidu praturtintų PMN-PT keramikų gamyba ir dielektrinis charakterizavimas /
… The PMN-10PT ceramic samples with addition of MnO2 (0.5 and 1.0 mol%) were prepared by the mechanochemical synthesis and sintering at 1473 K for 2 h. The samples were single-phase perovskites with a relative density above 95 % and grain sizes in the 3-5 micron range. The addition of Mn …
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