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101.
Atsuo Yamada 《Molecules (Basel, Switzerland)》2021,26(17)
High-voltage generation (over 4 V versus Li+/Li) of polyanion-positive electrode materials is usually achieved by Ni3+/Ni2+, Co3+/Co2+, or V4+/V3+ redox couples, all of which, however, encounter cost and toxicity issues. In this short review, our recent efforts to utilize alternative abundant and less toxic Fe3+/Fe2+ and Cr4+/Cr3+ redox couples are summarized. Most successful examples are alluaudite Na2Fe2(SO4)3 (3.8 V versus sodium and hence 4.1 V versus lithium) and β1-Na3Al2(PO4)2F3-type Na3Cr2(PO4)2F3 (4.7 V versus sodium and hence 5.0 V versus lithium), where maximizing ΔG by edge-sharing Fe3+-Fe3+ Coulombic repulsion and the use of the 3d2/3d3 configuration of Cr4+/Cr3+ are essential for each case. Possible exploration of new high-voltage cathode materials is also discussed. 相似文献
102.
Elemental and chemical state depth analysis by combined use of a polycapillary and a thin wire in a synchrotron X‐ray microprobe
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Atsuo Iida 《X射线光谱测定》2017,46(4):225-228
A simple method is proposed to improve the depth resolution of a conventional X‐ray confocal microscopy system by adding a thin wire close to the sample surface and upstream of the polycapillary in the exit channel. A depth resolution of around 10 μm is easily obtained. The detection efficiency is improved by a factor of two to three times, compared with the thin wire technique previously proposed. It is also shown that not only the elemental distribution but also the X‐ray absorption near‐edge structure (XANES) spectrum from locations below the sample surface can be obtained. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
103.
Qifeng Zheng Shota Miura Kasumi Miyazaki Seongjae Ko Eriko Watanabe Masaki Okoshi Chien‐Pin Chou Yoshifumi Nishimura Hiromi Nakai Takeshi Kamiya Tsunetoshi Honda Jun Akikusa Yuki Yamada Atsuo Yamada 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(40):14340-14345
Aqueous Na‐ or K‐ion batteries could virtually eliminate the safety and cost concerns raised from Li‐ion batteries, but their widespread applications have generally suffered from narrow electrochemical potential window (ca. 1.23 V) of aqueous electrolytes that leads to low energy density. Herein, by exploring optimized eutectic systems of Na and K salts with asymmetric imide anions, we discovered, for the first time, room‐temperature hydrate melts for Na and K systems, which are the second and third alkali metal hydrate melts reported since the first discovery of Li hydrate melt by our group in 2016. The newly discovered Na‐ and K‐ hydrate melts could significantly extend the potential window up to 2.7 and 2.5 V (at Pt electrode), respectively, owing to the merit that almost all water molecules participate in the Na+ or K+ hydration shells. As a proof‐of‐concept, a prototype Na3V2(PO4)2F3|NaTi2(PO4)3 aqueous Na‐ion full‐cell with the Na‐hydrate‐melt electrolyte delivers an average discharge voltage of 1.75 V, that is among the highest value ever reported for all aqueous Na‐ion batteries. 相似文献
104.
Asahi Tomitaka Atsuo Hirukawa Shin Morishita 《Journal of magnetism and magnetic materials》2009,321(10):1482-1484
Magnetic nanoparticles for thermotherapy must be biocompatible and possess high thermal efficiency as heating elements. The biocompatibility of Fe3O4 (20-30 nm), ZnFe2O4 (15-30 nm) and NiFe2O4 (20-30 nm) nanoparticles was studied using a cytotoxicity colony formation assay and a cell viability assay. The Fe3O4 sample was found to be biocompatible on HeLa cells. While ZnFe2O4 and NiFe2O4 were non-toxic at low concentrations, HeLa cells exhibited cytotoxic effects when exposed to concentrations of 100 μg/ml nanoparticles. 相似文献
105.
Mutsumi Sano Sunao Takahashi Tetsuro Mochizuki Atsuo Watanabe Masaki Oura Hideo Kitamura 《Journal of synchrotron radiation》2008,15(1):1-7
The thermal contact conductance (TCC) of a real front‐end component at SPring‐8 has been quantitatively estimated by comparing the results of experiments with those of finite‐element analyses. In this paper one of the methods of predicting the TCC of a real instrument is presented. A metal filter assembly, which is an indirect‐cooling instrument, was selected for the estimation of the TCC. The temperature of the metal filter assembly for the maximum heat load of synchrotron radiation was calculated from the TCC that is expected under normal conditions. This study contributes towards the ongoing research program being conducted to investigate the real thermal limitation of all front‐end high‐heat‐load components. 相似文献
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Solvable vertex models in statistical mechanics give rise to soliton cellular automata at q=0 in a ferromagnetic regime. By means of the crystal base theory we study a class of such automata associated with non-exceptional quantum affine algebras U′ $_q$ ( $\widehat {\mathfrak{g}}$ $_n$ ). Let B $_l$ be the crystal of the U′ $_q$ ( $\widehat {\mathfrak{g}}$ $_n$ )-module corresponding to the l-fold symmetric fusion of the vector representation. For any crystal of the form B = $B_{l_1 }$ ? ...? $B_{l_N }$ , we prove that the combinatorial R matrix B $_M$ ?B $\widetilde \to$ B?B $_M$ is factorized into a product of Weyl group operators in a certain domain if M is sufficiently large. It implies the factorization of certain transfer matrix at q=0, hence the time evolution in the associated cellular automata. The result generalizes the ball-moving algorithm in the box-ball systems. 相似文献
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