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991.
Yusuke Ishizaka Natsumi Arai Dr. Kazuhiro Matsumoto Dr. Hiroki Nagashima Dr. Katsuhiko Takeuchi Dr. Norihisa Fukaya Dr. Hiroyuki Yasuda Dr. Kazuhiko Sato Dr. Jun-Chul Choi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(47):12069-12077
Recent advances in surface organometallic chemistry have enabled the detailed characterization of the surface species in single-site heterogeneous catalysts. However, the selective formation of bis-grafted surface species remains challenging because of the heterogeneity of the supporting surface. Herein, we introduce a metal complex bearing bidentate disilicate ligands, −OSi(OtBu)2OSi(OtBu)2O−, as a molecular precursor, which has a silicate framework adjacent to the metal (Pt) center. The grafting of the precursors on silica supports (MCM-41 and CARiACT Q10) proceeded through a substitution reaction on the silicon atoms of the disilicate ligand, which was verified by the detection of isobutene and tBuOH as the elimination products, to selectively yield bis-grafted surface species. The chemical structure of the surface species was characterized by solid-state NMR, and the chemical shift values of the ancillary ligands and 195Pt nuclei suggested that the bidentate coordination sphere was maintained following grafting. 相似文献
992.
Dr. Ze-Xing Cai Dr. Jongbeom Na Prof. Jianjian Lin Prof. Abdulmohsen Ali Alshehri Prof. Khalid Ahmed Alzahrani Prof. Yousef Gamaan Alghamdi Hyunsoo Lim Dr. Jie Zheng Dr. Wei Xia Prof. Zhong-Li Wang Prof. Yusuke Yamauchi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(28):6195-6204
Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for establishing a sustainable and environmentally friendly energy system, but it is still a challenging issue. Herein, hierarchical tubular-structured CoS2-MoS2/C as efficient electrocatalysts are fabricated through a unique metal–organic framework (MOF) mediated self-sacrificial templating. Core–shell structured MoO3@ZIF-67 nanorods are used both as a precursor and a sacrificial template to form the one-dimensional tubular heterostructure where vertically aligned two-dimensional CoS2-MoS2 nanosheets are formed on the MOF-derived carbon tube. Trace amounts of noble metals (Pd, Rh, and Ru) are successfully introduced to enhance the electrocatalytic property of the CoS2-MoS2/C nanocomposites. The as-synthesized hierarchical tubular heterostructures exhibit excellent HER catalytic performance owing to the merits of the hierarchical hollow architecture with abundantly exposed edges and the uniformly dispersed active sites. Impressively, the optimal Pd-CoS2-MoS2/C-600 catalyst delivers a current density of 10 mA cm−2 at a low overpotential of 144 mV and a small Tafel slope of 59.9 mV/dec in 0.5 m H2SO4. Overall, this MOF-mediated strategy can be extended to the rational design and synthesis of other hollow heterogeneous catalysts for scalable hydrogen generation. 相似文献
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Yusuke Hashimoto Munetaka Taguchi Shun Fukami Hiroki Momono Tomohiro Matsushita Hiroyuki Matsuda Fumihiko Matsui Hiroshi Daimon 《Surface and interface analysis : SIA》2019,51(1):115-119
Fe 2p core-level photoelectron spectra of magnetite were measured using soft X-ray and hard X-ray, and its emission angle dependence was investigated. The photoelectron diffraction pattern from different atomic sites differs because the atomic arrangement surrounding each site is different. By selecting the forward-focusing-peak (FFP) directions characteristic to each atomic site and measuring the kinetic energy dependence of the FFP intensities at the Fe 2p core-level range, we succeed in detecting the variation of the peak intensity of Fe 2p core-level spectra at different emission directions. This result, consistent with recent results, suggests that the lower-binding-energy peak of the Fe 2p core-level spectrum may be assigned as the B site component. 相似文献
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997.
Kenji Kinashi Yusuke Miyashita Kenji Ishida Yasukiyo Ueda 《Journal of Physical Organic Chemistry》2012,25(5):427-430
A composite film containing photochromic spiropyran dye 1 and BaFCl:Eu was developed for X‐ray dose measurement at a level of a few dozen gray (Gy). The reflectance intensity at selected wavelength, obtained from X‐radiation, can be satisfactorily related to the absorbed dose in the range of 0?30 Gy. The composite film shows significant color change in the visible region, and the sensitivity of the composite to the absorbed dose was achieved based on the high molar extinction coefficient of the photomerocyanine form of dye 1. For practical application, the photoinduced blue area indicates an X‐radiated area, and the initial pale pink area indicates an unexposed area. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
998.
Bo Huang Hirokazu Kobayashi Tomokazu Yamamoto Takaaki Toriyama Syo Matsumura Yoshihide Nishida Katsutoshi Sato Katsutoshi Nagaoka Masaaki Haneda Wei Xie Yusuke Nanba Michihisa Koyama Fenglong Wang Shogo Kawaguchi Yoshiki Kubota Hiroshi Kitagawa 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(8)
999.
Kozawa Takahiro Kondo Akira Fukuyama Kayo Naito Makio Koga Hideyuki Shimo Yusuke Saito Toshiya Iba Hideki Inda Yasushi Oono Tomomi Katoh Takashi Nakajima Kousuke 《Journal of Solid State Electrochemistry》2019,23(4):1297-1302
Journal of Solid State Electrochemistry - All-solid-state Li batteries are suitable for the application of 5 V-class cathode materials that can provide high energy densities. However, it is hard to... 相似文献
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