記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/adma.201603131

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/adma.201602450

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/nl1029336

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.2357547

出版者・発行元：Nano Energy  

Local surface plasmon resonance (LSPR) is introduced into traditional photocatalytic systems, which has become a research focus. However, there is still a huge gap in the research of LSPR effect, especially the requirement of ideal plasma carrier has not been fully elaborated and planned. Here, a single crystal Cu<inf>2</inf>O nanoreactor (Cu<inf>2</inf>O-V) was synthesized with surface modified silver nanoparticles as an optical antenna for CO<inf>2</inf> conversion. The precisely designed Cu<inf>2</inf>O single crystal structure has a highly ordered atomic arrangement and fewer grain boundary defects, which provides a high-speed electron transport path and greatly improves the stability of Cu⁺. Meanwhile, the vesicle structure and thin shell array formation of Cu<inf>2</inf>O-V form a "double light trap", showing prominent LSPR amplification effect. This allows the catalyst to be uniformly immersed in the local electromagnetic field, further increasing the rate of carrier generation and transfer. Finally, under the synergistic action of “double light trap” and LSPR, Ag<inf>5 %</inf>-Cu<inf>2</inf>O-V shows first-class performance and excellent stability. A small amount of C<inf>2</inf>H<inf>4</inf> was also detected. This study reveals the effect of a single crystal Cu<inf>2</inf>O catalyst characterized by a high-speed electron transport channel and vesicle array structure combined with LSPR on the photoreactivity.

DOI： 10.1016/j.nanoen.2025.110930

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出版者・発行元：Current Applied Physics  

Understanding the ultra-fast dynamics of ferroelectric materials is essential for advancing the development of next-generation high speed electronic and photonic devices. Here, the ultrafast piezoelectric response of cobalt-substituted BiFeO<inf>3</inf> (BiFe<inf>1-x</inf>Co<inf>x</inf>O<inf>3</inf>) with x = 0.15, consisting of morphotropic phase boundary of monoclinic M<inf>C</inf> and M<inf>A</inf> –type phases is investigated. The real-time piezoelectric response in (001)-oriented BiFe<inf>0.85</inf>Co<inf>0.15</inf>O<inf>3</inf> (BFCO) epitaxial thin film was monitored using the time-resolved X-ray microdiffraction technique under an applied electric field with pulse widths 70 ns and 100 ns. The BFCO thin film yielded a high piezoelectric strain of approximately 0.53 % along [001] direction, with a giant c/a ratio (∼1.26) at an electric field of 1.3 MV/cm and a pulse width of 100 ns, with a piezoelectric coefficient (d<inf>33</inf>) of 40 pm/V. This finding is an important step towards the development of a high performance lead-free piezoelectric material for ultrafast operations in advanced technological applications.

DOI： 10.1016/j.cap.2024.11.012

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出版者・発行元：Industrial and Engineering Chemistry Research  

Catalytic dehydration of bioethanol using tungsten polyoxometalate (POM) clusters is a viable method for the sustainable production of ethylene, a valuable industrial chemical. The reaction process of ethanol dehydration on mesoporous-silica-SBA-15 (SBA-15)-supported heteropolyacids (HPAs) involves complex parallel-consecutive pathways, which differ from those involved in pure HPAs systems. Notably, the reaction progresses from the formation of diethyl ether at lower temperatures to the complete generation of ethylene at higher temperatures. To conserve energy, achieving high selectivity for ethylene at lower temperatures is crucial. In this study, we impregnated 12-tungstophosphoric acid into an SBA-15 catalyst, followed by microwave-assisted heating to obtain a catalyst that facilitates the dehydration of ethanol to ethylene. Experimental findings revealed that this catalytic technique achieves a reaction at lower temperatures than conventional thermal catalysis, exhibiting conversion rates and selectivity values exceeding 99%. Additionally, the influence of the substrate on the entire reaction process was elucidated by clarifying the reaction pathways using theoretical calculations.

DOI： 10.1021/acs.iecr.4c04420

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出版者・発行元：Journal of Physical Chemistry C  

Microwave heating is an effective method for efficiently heating a target material, allowing the chemical reaction processes to proceed quickly. In catalytic reactions under microwave irradiation, it is essential to understand the relationship between the structure and physical properties of the material to be used as a catalyst and microwave heating. In this study, we focused on tungsten oxides, which absorb microwaves and convert them into heat, and we compared the microwave heating properties of tungsten oxides with different structures. The heating properties of tungsten oxides under microwave irradiation are highly dependent on their morphologies. WO<inf>3</inf> nanoflakes with a monoclinic phase structure have a more rapidly heated surface than tungsten oxides with other morphologies. The heating characteristics of each tungsten oxide were consistent with the dielectric loss factor obtained by the perturbation method. Finite element analysis was used to gain a better understanding of the thermal distribution of materials during microwave irradiation.

DOI： 10.1021/acs.jpcc.4c02936

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出版者・発行元：Physical Review B  

Perovskites with Bi or Pb on the A site host a number of interesting and yet to be understood phenomena such as negative thermal expansion in BiNiO3. We employ hard x-ray photoemission spectroscopy of Ni 2p core level as well as valence band to probe the electronic structure of BiNiO3 and PbNiO3. The experimental results supported by theoretical calculations using dynamical mean-field theory reveal essentially identical electronic structure of the Ni-O subsystem typical of Ni2+ charge-transfer insulators. The two materials are distinguished by filling of the Bi(Pb)-O antibonding states in the vicinity of the Fermi level, which is responsible for the Bi disproportionation in BiNiO3 at ambient pressure and absence of similar behavior in PbNiO3. The present experiments provide evidence for this conclusion by revealing the presence/absence of Bi/Pb 6s states at the top of the valence band in the two materials.

DOI： 10.1103/PhysRevB.109.205131

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出版者・発行元：Journal of the Taiwan Institute of Chemical Engineers  

Microwave-assisted catalytic reactions have been investigated for energy-efficient chemical processes. However, catalysts with comparatively high heating properties, activities, and economics have been developed with limited success. In this study, we investigated the catalytic properties of Ce addition to LaNiO<inf>3</inf> catalyst, which has high CO oxidation activity and high microwave heating properties. Ce-added catalysts exhibited high heating properties under microwave heating. Increasing the Ce content in the catalyst enhanced the dielectric loss factor, the ability to absorb microwaves and convert them to heat, and improved the microwave heating properties of the catalyst. The catalytic activity toward CO oxidation over Ce-added catalysts decreased in the order of La<inf>0.8</inf>Ce<inf>0.2</inf>NiO<inf>3</inf> > La<inf>0.9</inf>Ce<inf>0.1</inf>NiO<inf>3</inf> > LaNiO<inf>3</inf> at all oxygen partial pressures when compared to the same microwave power. To clarify the role of Ce addition, temperature programmed reduction (TPR) by H<inf>2</inf> <inf>,</inf> CO, and XAFS measurements were performed. TPR results suggested that Ce promotes oxygen mobility and then affects both CO oxidation and microwave heating properties.

DOI： 10.1016/j.jtice.2023.105041

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7181937

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   出版者・発行元：Wiley  

CeO<inf>2</inf> and CeO<inf>2</inf>-based materials are widely used as catalysts and catalyst supports for a variety of chemical reactions. The ability to form oxygen vacancies plays an important role in the catalytic activities in these materials. Therefore, revealing the reduction mechanism for CeO<inf>2</inf> is crucial to understanding the catalytic activities. In this study, shape-controlled CeO<inf>2</inf> nanoparticles are fabricated and the distribution of surface oxygen vacancies on the (100) and (111) surfaces is systematically studied using scanning transmission electron microscopy and electron energy-loss spectroscopy and the response to H<inf>2</inf> reduction treatment. It is successfully demonstrated that both catalytic activities and the ability to form oxygen vacancies are strongly dependent on the type of lattice planes. Moreover, the present results provide important insights into the reduction mechanism for CeO<inf>2</inf>, in which bulk oxygen instead of the widely believed surface capping oxygen makes no small contribution to the initial reduction step.

DOI： 10.1002/admi.202201954

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CiNii Research

出版者・発行元：Catalysis Today  

ABO<inf>3</inf>-type perovskite oxides containing transition metals at the B site are effective catalysts for oxidation reactions. In this study, LaNiO<inf>3</inf> was prepared by the hydrolysis-precipitation method, and LaNiO<inf>3</inf> was modified with Mn by the impregnation method. LaNiO<inf>3</inf> showed higher CO oxidation activity than LaCoO<inf>3</inf>, LaMnO<inf>3</inf>, and LaFeO<inf>3</inf>. The high activity of LaNiO<inf>3</inf> was attributed to the reactivity of the lattice oxygen in LaNiO<inf>3</inf>, as confirmed by temperature-programmed reduction by H<inf>2</inf> (H<inf>2</inf>-TPR) and CO-TPR studies. The Mn-modified LaNiO<inf>3</inf> exhibited higher activity for benzene oxidation than LaNiO<inf>3</inf>. The CO oxidation properties of the Mn-modified LaNiO<inf>3</inf> catalysts correlated with their H<inf>2</inf>-reduction properties, whereas benzene oxidation properties were improved by the increasing amount of Mn on the catalyst surface.

DOI： 10.1016/j.cattod.2022.07.002

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出版者・発行元：ACS Catalysis  

The photocatalytic oxidation of benzene to phenol driven by visible light (λ > 420 nm) at room temperature and under ambient pressure is a promising process. In particular, the application of heterogeneous catalysts to benzene photooxidation, where the catalyst and product are easily separated, facilitates the construction of practical processes. Here, we report that a Pt-loaded 1D monoclinic WO<inf>3</inf>nanorod (Pt/m-WNR) exhibited higher activities than other Pt/WO<inf>3</inf>catalysts with different crystal structures and morphologies in water under ambient conditions and visible light. Pt/m-WNR showed high stability in repeated reactions. Furthermore, other typical photocatalysts (TiO<inf>2</inf>, Bi<inf>2</inf>WO<inf>6</inf>, Bi<inf>2</inf>MoO<inf>6</inf>, BiOBr, and C<inf>3</inf>N<inf>4</inf>) showed negligible phenol formation using Pt as a cocatalyst. Both experimental results and density functional theory calculations show that the specific performance of Pt/m-WNR is due to the efficient reduction of O<inf>2</inf>to produce hydroxyl radicals via H<inf>2</inf>O<inf>2</inf>as an intermediate. Notably, m-WNR shows much higher phenol formation than h-WNR, although h-WNR has a higher surface area. The higher activity of m-WNR may be due to its lower work function to provide electrons for O<inf>2</inf>reduction. A lower work function will favorably form a higher Schottky barrier with Pt nanoparticles to suppress the recombination of photogenerated charge carriers. The effect of the Schottky barrier is further confirmed by different activities using various metal particles as cocatalysts.

DOI： 10.1021/acscatal.2c03832

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出版者・発行元：Industrial and Engineering Chemistry Research  

Catalytic CO oxidation processes under dilute oxygen conditions are key industrial and environmental processes. CeO<inf>2</inf>-supported Pd and Pd-Cu catalysts (Pd/CeO<inf>2</inf>and Pd-Cu/CeO<inf>2</inf>) were prepared by impregnation, and the effect of Cu addition on the catalytic properties of CO oxidation was investigated under CO/O<inf>2</inf>stoichiometric conditions. The activity of Pd/CeO<inf>2</inf>was superior to that of Pd/TiO<inf>2</inf>and Pd/Al<inf>2</inf>O<inf>3</inf>at low temperatures. The Cu addition to Pd/CeO<inf>2</inf>with a Cu/Pd molar ratio of approximately 1-5 enhanced the CO oxidation activity. Small PdO particles were distributed over the CeO<inf>2</inf>surfaces, and Cu addition decreased the size of the Pd particles on the CeO<inf>2</inf>and increased the fraction of highly reactive Pd sites. As the Cu/Pd mole fraction in the Pd-Cu/CeO<inf>2</inf>catalyst increased to 10, the PdO on CeO<inf>2</inf>agglomerated significantly, and the CO oxidation activity decreased.

DOI： 10.1021/acs.iecr.2c02199

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記述言語：英語   出版者・発行元：Science  

A goal in the characterization of supported metal catalysts is to achieve particle-by-particle analysis of the charge state strongly correlated with the catalytic activity. Here, we demonstrate the direct identification of the charge state of individual platinum nanoparticles (NPs) supported on titanium dioxide using ultrahigh sensitivity and precision electron holography. Sophisticated phase-shift analysis for the part of the NPs protruding into the vacuum visualized slight potential changes around individual platinum NPs. The analysis revealed the number (only one to six electrons) and sense (positive or negative) of the charge per platinum NP. The underlying mechanism of platinum charging is explained by the work function differences between platinum and titanium dioxide (depending on the orientation relationship and lattice distortion) and by first-principles calculations in terms of the charge transfer processes.

DOI： 10.1126/science.abq5868

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PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7181932

出版者・発行元：Journal of Environmental Chemical Engineering  

Microwave-assisted process has been demonstrated to have immense potential for promoting chemical reactions and reducing energy consumption. In this study, catalytic oxidation of benzene was carried out over Co-Cu-Mn mixed oxides (CoxMn1-xCuOy) under microwave irradiation. The spinel-type mixed oxides were mainly formed for the Co-Cu-Mn mixed oxides with different Co/Mn ratios. The substitution of Mn sites by Co was confirmed by Fourier and Wavelet transformed extended x-ray absorption fine structure spectra. As the Co/Mn ratio increased, the heating characteristics of the catalysts under microwave irradiation monotonically improved. The benzene oxidation activity increased on the Co/Mn ratio of 2/3 due to the enhanced specific surface area, benzene adsorption properties, and lattice-oxygen reactivity. Microwave inducing significantly lowered the reaction temperature required for benzene oxidation. Co0.4Mn0.6CuOy completely oxidized benzene at a relatively low microwave power compared to pristine Cu-Mn oxides. The Co-Cu-Mn oxides showed high activity and stability for benzene oxidation even under humid conditions. Combining pre-adsorption and thermal oxidation processes on Co0.4Mn0.6CuOy improved the low concentration of benzene oxidation efficiency by rapid microwave heating. The compound of Co0.4Mn0.6CuOy and Co0.8Mn0.2CuOy mixed at 3:1 showed even higher activity than Co0.4Mn0.6CuOy.

DOI： 10.1016/j.jece.2022.108212

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7181931

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7179521

記述言語：英語   出版者・発行元：Journal of Hazardous Materials  

Microwave-assisted heterogeneous catalytic oxidation of benzene was investigated over Cu-Mn spinel oxides. The spinel oxides were synthesized by a coprecipitation method from metal nitrate hydrolysis in a solution using tetramethylammonium hydroxide (TMAH) as a precipitation reagent. The catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption fine structure, scanning electron microscopy, transmission electron microscope and H<inf>2</inf>-temperature-programmed reduction studies. Microwave absorption by the Cu-Mn spinel oxide is mainly driven by dielectric losses (dielectric heating). Cu-Mn spinel oxide with a Cu/Mn ratio of 1 exhibited superior activity to single oxides under microwave heating, demonstrating lower apparent activation energy than that obtained under conventional heating. Microwave irradiation lowered the reaction temperature required for benzene oxidation compared with conventional heating. Transient tests were used to investigate the reactivity of oxygen species in the catalytic reaction, and the high reactivity of Cu-Mn spinel oxides was related to the high reactivity of lattice oxygen on the catalyst surface. The reactivity of the oxygen species was enhanced under microwave heating, leading to an enhanced benzene oxidation reaction. The combination of adsorption and catalytic oxidation processes using Cu-Mn spinel oxides and zeolites efficiently decomposed benzene at low concentrations.

DOI： 10.1016/j.jhazmat.2021.127523

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PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7179520

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7179519

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7161519

記述言語：英語   出版者・発行元：Nano Letters  

Understanding the nature of the interaction between a metal and support, which is known as the metal–support interaction, in supported metal catalysts is crucial to design catalysts with desired properties. Here, we have developed model Pt/TiO<inf>2</inf> catalysts based on the deposition of colloidal Pt nanoparticles and studied their atomic and electronic structures before and after a postdeposition treatment that induces catalytic activity using aberration-corrected scanning transmission electron microscopy, electron energy loss spectroscopy, and first-principles calculations. Direct contact between Pt nanoparticles and TiO<inf>2</inf> is realized after the postdeposition treatment, which is accompanied by the formation of a Ti³⁺ state on the TiO<inf>2</inf> surface close to the Pt nanoparticles and a Pt^δ+ state on the Pt nanoparticles. The origin of these two states and their effect on the catalytic properties are discussed. These findings pave the way for a comprehensive understanding of metal–support interactions in supported metal catalysts.

DOI： 10.1021/acs.nanolett.1c03485

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PubMed

出版者・発行元：Chemistry of Materials  

The B-site-ordered double-perovskite Pb2NiMoO6 was prepared at high pressure and high temperature. The structural analysis of synchrotron powder X-ray diffraction data shows that Pb2NiMoO6 crystallizes into monoclinic symmetry with the space group Pc (no. 7), where the Ni and Mo ions are ordered in a rock-salt-type manner. The magnetic and specific heat characterizations reveal unusual two-step antiferromagnetic (AFM) transitions at 18 and 26 K for Pb2NiMoO6. The X-ray absorption spectra at the Ni-L2,3 edge and the Mo-L3 edge and the high-resolution partial fluorescence yield at the Pb-L3 edge indicate Pb2+2Ni2+Mo6+O6 valence states. Although in A2NiMoO6 (A = Sr2+, Pb2+, and Ba2+), the size of the A cation increases gradually from Sr2+ (1.44 Å) to Pb2+ (1.49 Å) to Ba2+ (1.61 Å), Pb2NiMoO6 exhibits much lower symmetry structure and AFM transition temperature, TN, compared with Sr2NiMoO6 (I4/m, TN = 81 K) and Ba2NiMoO6 (Fm3¯ m, TN = 64 K), which is attributed to the large distortion of NiO6 and MoO6 octahedra induced by the lone pair electron effect of Pb2+ with a 6s2 electronic configuration. Moreover, symmetry-breaking phase transition from a high-temperature centrosymmetric, cubic Fm3¯ m phase to a low-temperature non-centrosymmetric, monoclinic Pc phase was observed at 393-413 K in Pb2NiMoO6.

DOI： 10.1021/acs.chemmater.1c02826

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出版者・発行元：Chemical Engineering Journal  

The synthesis of phenol by one-pot oxidation of benzene with dioxygen (O<inf>2</inf>) is a significant conceptual and practical challenge because benzene has low reactivity to O<inf>2</inf> at room temperature and ambient pressure. Furthermore, phenol is more reactive than benzene and is easily overoxidized, so complete oxidation is more likely to proceed in the benzene oxidation reaction, which generally results in lower phenol yield and selectivity. Herein, we report that a heteropolyacid H<inf>3</inf>PW<inf>12</inf>O<inf>40</inf> functions as a photocatalyst for benzene oxidation reaction in an aqueous acetonitrile solution using O<inf>2</inf> in high phenol yield (23–41%) and selectivity (80–90%). The addition of acetonitrile to the reaction solution significantly inhibited the complexation between phenol and H<inf>3</inf>PW<inf>12</inf>O<inf>40</inf>, preventing phenol overoxidation. Furthermore, no decomposition of H<inf>3</inf>PW<inf>12</inf>O<inf>40</inf> during the reaction was evidenced by UV–VIS spectra. This photocatalyst can be used repeatedly with only a slight decrease in the rate of phenol formation. For the mechanistic study, the initial rates, which depended on the reaction conditions, were investigated in detail. The benzene oxidation under anaerobic conditions was also conducted as a control experiment. A color change of reaction solution from colorless to blue has confirmed the reduction of H<inf>3</inf>PW<inf>12</inf>O<inf>40</inf> during the catalytic process and the formation of reduced H<inf>3</inf>PW<inf>12</inf>O<inf>40</inf> detected in the UV–VIS spectra. A kinetic isotope effect (KIE), k<inf>H</inf>/k<inf>D</inf> = 1.15, is found for the oxidation of benzene/benzene‑d<inf>6</inf>, indicating electron transfer is the principal C−H bond activation process in the mechanism. We identified hydrogen peroxide as an intermediate and found that phenol was generated in both the photocatalytic reduction and reoxidation process in our system.

DOI： 10.1016/j.cej.2021.131369

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： https://hdl.handle.net/2324/7181923

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/d1tc01711j

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41467-021-22064-9

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acsami.0c18482

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.cej.2020.126220

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Modifying photocatalyst with defects offers effective pathway to tailor light absorption properties, but may result in more sluggish kinetics. Therefore, enhanced light absorption often could not guarantee increased activity. Here, we report a dual defect strategy to extend light absorption with minimal loss in charge dynamics. Fine-tuned amount of dual defect, i.e., nitrogen defects and single-site copper, is simultaneously generated in polymer carbon nitride(PCN) through in-situ vapor diffusion method. Surface nitrogen defect extends the light absorption to long-wavelength via sub-band absorption. The interaction between nitrogen and single-site copper at certain concentration retains the charge dynamics by making the photogenerated electrons more delocalized through the newly-formed copper-nitrogen bonds. As a result, champion modified PCN exhibits robust hydrogen production activity, roughly 4.5-fold greater than the pristine counterpart in both visible and full light ranges. More intriguingly, this synergism provides PCN with efficient visible light activity even in faint tailing optical absorption region(>450 nm).

DOI： 10.1016/j.apcatb.2020.119099

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.chemmater.0c00444

記述言語：英語   掲載種別：研究論文（学術雑誌）  

ϵ-Fe2O3, a metastable phase of iron oxide, is widely known as a roomerature multiferroic material or as a superhard magnet. Element substitution into ϵ-Fe2O3 has been reported in the literature; however, the substituted ions have a strong site preference depending on their ionic radii and valence. In this study, in order to characterize the crystal structure and magnetic properties of ϵ-Fe2O3 in the Fe2+/Fe3+ coexisting states, Li+ was electrochemically inserted into ϵ-Fe2O3 to reduce Fe3+. The discharge and charge of Li+ into/from ϵ-Fe2O3 revealed that Li+ insertion was successful. X-ray magnetic circular dichroism results indicated that the reduced Fe did not exhibit site preference. Increasing the Li+ content in ϵ-Fe2O3 resulted in decreased saturation magnetization and irregular variation of the coercive field. We present a comprehensive discussion of how magnetic properties are modified with increasing Li+ content using transmission electron microscopy images and considering the Li+ diffusion coefficient. The results suggest that inserting Li+ into crystalline ϵ-Fe2O3 is a useful tool for characterizing crystal structure, lithiation limit, and magnetic properties in the coexistence of Fe2+/Fe3+.

DOI： 10.1021/acs.inorgchem.9b03302

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jacs.9b10336

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Pt/TiO2 microspheres with sea-urchin like structures were prepared by sequential processes including the preparation of TiO2 by a hydrothermal method and the preheating of the TiO2, the deposition of Pt nanoparticles on the TiO2 surface, followed by post heating in O2/N2 and H2. The TiO2 and Pt/TiO2 catalysts were characterized by XRD, Raman, SEM, TEM and N2 adsorption studies. The average diameter of TiO2 microspheres was about 250 nm. The TiO2 microspheres were composed of TiO2 nanoparticles with the size of 20−30 nm. Pt particles with the size of 3 nm were highly dispersed on the TiO2 microsphere by liquid phase adsorption of colloidal Pt particles. The heating of TiO2 at 300 °C before and after the Pt deposition did not change the size of TiO2 microsphere and reduced the surface area from 238 to 137 m2 g-1. The Pt/TiO2 microsphere exhibited higher catalytic activity for benzene oxidation than Pt/TiO2 P25 under normal outer heating, whereas pristine TiO2 exhibited almost no activity. Activated carbon was used as a catalyst with a mixture of Pt/TiO2 microspheres when performing the catalytic reaction under microwave heating. The mixture of Pt/TiO2 and activated carbon showed higher benzene oxidation activity under microwave irradiation than under normal external heating. The mixture was applied to benzene adsorption-catalytic oxidation combined processes.

DOI： 10.1016/j.cattod.2020.05.021

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10563-019-09268-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.cattod.2018.07.055

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.nanolett.8b04765

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11356-019-04264-5

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.chemmater.8b04266

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c8nr08372j

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DOI： 10.1063/1.5024710

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DOI： 10.1039/c7dt03244g

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DOI： 10.1002/adma.201703435

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DOI： 10.1021/jacs.7b01851

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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