A5071736692- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Porphyrin and Phthalocyanine Chemistry
- Ionic liquids properties and applications
- Quantum Dots Synthesis And Properties
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Photochromic and Fluorescence Chemistry
- Polyoxometalates: Synthesis and Applications
- Analytical Chemistry and Sensors
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Machine Learning in Materials Science
- Chalcogenide Semiconductor Thin Films
- Transition Metal Oxide Nanomaterials
- Ammonia Synthesis and Nitrogen Reduction
- Electron and X-Ray Spectroscopy Techniques
- Photochemistry and Electron Transfer Studies
- Polymer Nanocomposite Synthesis and Irradiation
- Molecular Junctions and Nanostructures
- Hydrogen Storage and Materials
Toyota Central Research and Development Laboratories (Japan)
2010-2022
Toyota Research Institute
2014-2019
Ann Arbor Center for Independent Living
2018
Toyota Motor Corporation (Switzerland)
2006-2017
Kyushu University
2010-2011
University of Notre Dame
2006-2008
Alliance University
2008
University of Tsukuba
2008
National Institute for Interdisciplinary Science and Technology
2008
Ingenierie des Materiaux polymeres
1999
Different-sized CdSe quantum dots have been assembled on TiO2 films composed of particle and nanotube morphologies using a bifunctional linker molecule. Upon band-gap excitation, inject electrons into nanoparticles nanotubes, thus enabling the generation photocurrent in photoelectrochemical solar cell. The results presented this study highlight two major findings: (i) ability to tune response photoconversion efficiency via size control (ii) improvement by facilitating charge transport...
Portable power sources and grid-scale storage both require batteries combining high energy density low cost. Zinc metal battery systems are attractive due to the cost of zinc its charge-storage capacity. However, under repeated plating stripping, anodes undergo a well-known problem, dendrite formation, causing internal shorting. Here we show backside-plating configuration that enables long-term cycling without We demonstrate 800 stable cycles nickel-zinc with good rate (20 mA cm(-2), 20 C...
A new gas-utilizing battery using mixed gas of O(2) and CO(2) was developed proved its very high discharge capacity. The capacity reached three times as much that a non-aqueous Li-air (O(2)) battery. unique point the is expected to be rapid consumption superoxide anion radical by well slow filling property Li(2)CO(3) in cathode.
The influence of single-walled carbon nanotube (SWCNT) architectures for facilitating charge transport in mesoscopic semiconductor films has been probed using a TiO2/Ru(II) trisbipyridyl complex system. Both transient absorption and emission measurements indicate that the SWCNT network film no noticeable on injection process from excited Ru(II) into TiO2 particles. However, it plays an important role improving separation, as rate back electron transfer between oxidized sensitizer (Ru(III))...
It is widely acknowledged that Li2CO3 and LiOH as side-products in the operation of a Li–air cell should be completely removed cycling to avoid cumulative negative effect on performance. However, understanding their electrochemical decomposition limited. We report mechanistic analysis intrinsic barrier electrochemically decompose LiOH. Our first-principles study reveals rate-limited by extraction Li+, whereas chemical release anions barrierless once applied voltage overcomes energy penalty...
A redox-active supercooled liquid is obtained by forming a "solvate ionic liquid" from mixture of stabilized organic radical and specific Li salt stabilizing the further below their melting points. As catholyte, addition an appropriate amount water helps to enhance electrochemical advantage while maintaining its nature shows high energy density 200 W h L(-1) with reversible charge/discharge.
The conduction of the bivalent magnesium cation, Mg(2+), in an inorganic solid state material, Mg(BH4)(NH2), has been demonstrated. This material exhibited a high ionic conductivity 10(-6) S cm(-1) at 150 °C, and its electrochemical window was estimated to be approximately 3 V using cyclic voltammetry.
We propose a catalytic cycle using the iodine-dimethylsulfoxide (I2-DMSO) complex for realization of secondary Mg-O2 batteries. have demonstrated that battery incorporating an I2-DMSO electrolyte showed evidence being rechargeable.
Liquid electrolytes for rechargeable Li-air batteries were chosen from viewpoints of the electrochemical stability against O2 radical, O2−. Mulliken atomic charges electrolyte solvents and their reversibility O2/O2− redox couple first examined. In carbonate-based electrolytes, localization positive charge in molecules was confirmed, resulting low radical. The must be decomposed by nucleophilic On other hand, nitrile-based piperidinium-based provided high radical because all cations either...
TiO2 and Ag@TiO2 core shell nanoparticles have been modified with a carbocyanine dye (IR-125) to extend the photoresponse in near-infrared. Upon binding molecules TiO2, we observe sharp decrease fluorescence yield. The electron injection into was found dominate deactivation of excited singlet state. rate constant for charge process as determined from decay is ∼1011 s-1. In case Ag@TiO2, electrons injected layer are quickly transferred Ag core. metal did not alter forward charge-transfer...
The addition of potassium superoxide (KO2) into the electrolyte for Li-air battery was proved to be an effective screening method examine stability solvents against anion radicals (O2•−). It also confirmed that coupled compound between Li+ and O2•−, namely LiO2•, highly reactive many decompose themselves. Specific ionic liquid dimethylsulfoxide, selected by KO2 test, actually performed stable operation battery.
Nonaqueous Mg-O2 batteries are suitable only as primary cells because MgO precipitates formed during discharging not decomposed electrochemically at ambient temperatures. To address this problem, the present study examined ability of 2,2,6,6-tetramethylpiperidine-oxyl (TEMPO)-anion complex to catalyze decomposition MgO. It was determined that capable chemically decomposing 60 °C. A catalytic cycle for realization a rechargeable electrode designed by combining via TEMPO-anion and TEMPO-redox...
Cycling stability at high capacities and water-tolerance are two key properties for the operation of high-capacity lithium (Li) metal–air batteries.
A novel indirect charging system that uses a redox mediator was demonstrated for Li-O2 batteries. 4-Methoxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl (MeO-TEMPO) applied as to enable the oxidation of Li2O2, even though Li2O2 is electrochemically isolated. This promotes without parasitic reactions attributed electrochemical and reduces time.
A solution of water in ionic liquid was tested as a practical electrolyte for Li–air batteries. Li metal deposition and stripping were repeatedly performed with an acceptable polarization voltage (<±250 mV) even under 1 vol % the electrolyte. Such advantageous performance explained by XPS surface analysis on after cycling thermodynamic state bulk Remarkably, chemical species (LiF LiOH) forming at Li/electrolyte interface did not evolve through addition water, suggesting that exist free...
Excited-state properties of the croconate dyes were investigated with an aim to utilize them as light harvesting assemblies in infrared (IR) region (λmax ∼ 865 nm and M−1 c−1 = (1.4−4.2) × 105 s−1). The excited singlet monomeric dye quickly deactivates (lifetime 4−7 ps) without undergoing intersystem crossing generate triplet. triplet excited-state produced via triplet–triplet energy transfer method show relatively long life 7.2 µs). molecules when deposited thin film on optically...
Precise knowledge of the discharge and charge reactions within Li-O2 batteries is an important aspect developing highly efficient, rechargeable cells. We describe analytical method capable determining quantity Li2O2 in cathode on basis reaction with oxoammonium salt.