2172 research outputs found
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Effects of Inorganic Additives on Properties of Polybenzimidazole Electrolyte Membranes for Medium Temperature Fuel Cells
Get PDF豊橋技術科学大学博士(工学)doctoral thesi
Bioavailable phosphorus in runoff suspended sediment in rivers flowing through contrasting land uses
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Design and control of a regenerative brake mechanism with a spiral spring
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Integration of Process Analysis and Decision-Making Tools for the Sustainability Improvements in Raw Rubber Manufacture
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Characterization of vacuum‐annealed TiNb2O7 as high potential anode material for lithium‐ion battery
Get PDFElectrochemical properties of mixed titanium‐niobium oxide TiNb2O7 (TNO) synthesized via vacuum annealing as high potential anode material for lithium‐ion batteries were investigated. Crystal structure, size, and morphology are nearly independent of the annealing atmosphere for starting materials but the color of vacuum‐annealed TNO (TNO‐V) is dark blue while white for the air‐annealed one (TNO‐A). X‐ray photoelectron spectroscopy analysis also indicated that Ti4+ and Nb5+ in TNO are partially reduced into Ti3+ and Nb4+ due to the introduction of oxygen vacancy. Electronic conductivity for TNO‐V was around 10−3 S cm−1 at room temperature and much higher than that for TNO‐A (=10−11 S cm−1). In electrochemical testing, both TNO‐A and TNO‐V electrodes showed reversible capacity of 260‐270 mAh g−1 at low current density of 0.5 mA cm−2, while at higher current density of 5.0 mA cm−2, TNO‐V electrode retained higher reversible capacity of 140 mAh g−1 than that for TNO‐A electrode (=80 mAh g−1). The enhancement of intrinsic electronic conductivity greatly contributes to improve the rate performance of TNO.journal articl
Li+ Insertion/Extraction Properties for TiNb2O7 Single Particle Characterized by a Particle-Current Collector Integrated Microelectrode
Get PDFIn this study, we evaluate the electrochemical properties of TiNb2O7 (TNO) single particle using a particle-current collector integrated microelectrode, in which TNO single particle with the size of approximately 10 μm was bonded on the tip of a tungsten microelectrode by platinum deposition using a focused ion beam process unit (FIB). Cyclic voltammogram of TNO single particle showed the reversible redox peaks at around 1.6−1.7 V vs. Li/Li+. Anodic peak current is higher than cathodic one at a fixed scan rate, indicating faster reaction during Li+ extraction (i.e. discharge) than Li+ insertion (i.e. charge) of TNO particle. This tendency was also confirmed in C-rate dependence of charge and discharge capacities. From the results for galvanostatic intermittent titration testing (GITT), we confirmed that at the equilibrium potential vs. Li/Li+ below 1.5 V, apparent chemical diffusion coefficient of Li+ in TNO at Li+ extraction process is much larger than at Li+ insertion process. Furthermore, the capacity retention of TNO single particle tested at current of 10C after 2000 cycles was above 99%, indicating excellent intrinsic stability of TNO single particle for Li+ insertion and extraction reaction.journal articl
“The Hilltop Hotel”, Designed by W.M.Vories (1) -Impressions from Various Writers-
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Interaction Design of Sociable Driving Agents as an Effective In-vehicle Interface
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Synthesis of Functional Core-Corona Polymer Microsphere and Its Application to Asymmetric Organocatalysis
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Reaction modeling for oxidation of aluminum with CO2 and H2O in gas phase
Get PDFA detailed chemical kinetic model for aluminum oxidation in gas phase has been investigated. Quantum chemical calculations were performed for obtaining structures of intermediates and transition states on the reaction pathways.
Intermediates were searched at the B3LYP/6 311G(d,p) level, and structures and energies were optimized by using CBS QB3 method. Rate coefficients of each reaction paths based on VTST or RRKM theory were also calculated for constructing the detail ed chemical kinetic model. Kinetic calculation s with only CO2 or H2O as an oxidizer were carried out by using this model under isobaric and isothermal conditions . Comparison of chemical composition s of kinetic calculation s with that of chemical equilibrium calculations shows the valid range of this model. Al2O ( with CO2 as an oxidizer), AlOH and Al2O2H2 (with H2O as an oxidizer) are metastable less than 2000 K though Al8O12 as critical nuclei of aluminum oxide in this model forms more than 2000 K. This model is reasonable although there is still room of improvement.12th Asia-Pacific Conference on Combustion,
Fukuoka International Congress Center, Fukuoka, Japan
1st -5th July 2019.conference pape