A5104652076- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Catalysis and Oxidation Reactions
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Zeolite Catalysis and Synthesis
- Layered Double Hydroxides Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Metal-Organic Frameworks: Synthesis and Applications
- Oxidative Organic Chemistry Reactions
- Axial and Atropisomeric Chirality Synthesis
- Synthetic Organic Chemistry Methods
- Copper-based nanomaterials and applications
- TiO2 Photocatalysis and Solar Cells
- ZnO doping and properties
- Catalytic Alkyne Reactions
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Iron oxide chemistry and applications
- Cyclization and Aryne Chemistry
- CO2 Reduction Techniques and Catalysts
- Organophosphorus compounds synthesis
- Chemical synthesis and alkaloids
Tohoku University
2024
University of Electro-Communications
2017-2022
Shimane University
2019
Kyoto University
2016-2017
Chiba University
2012-2016
Graduate School USA
2014-2015
Osaka University
1995-1996
Ube (Japan)
1993
Single-atom electrocatalysts (SAEs) can realize the target of low-cost by maximum atomic efficiency. However, they usually suffer performance decay due to high energy states, especially in a harsh acidic water splitting environment. Here, we conceive and double protecting strategy that ensures robust on Ir SAEs dispersing atoms in/onto Fe nanoparticles embedding IrFe into nitrogen-doped carbon nanotubes (Ir-SA@Fe@NCNT). When Ir-SA@Fe@NCNT acts as bifunctional electrocatalyst at ultralow...
Abstract Single-atom catalysts (SACs) with nitrogen-coordinated nonprecious metal sites have exhibited inimitable advantages in electrocatalysis. However, a large room for improving their activity and durability remains. Herein, we construct atomically dispersed Fe N-doped carbon supports by secondary-atom-doped strategy. Upon the secondary doping, density coordination environment of active can be efficiently tuned, enabling simultaneous improvement number reactivity site. Besides, structure...
Simultaneous improvements in oxygen reduction reaction (ORR) activity and long-term durability of Pt-based cathode catalysts are indispensable for the development next-generation polymer electrolyte fuel cells but still a major dilemma. We present robust octahedral core–shell PtNix/C electrocatalyst with high ORR performance (mass surface specific 6.8–16.9 20.3–24.0 times larger than those Pt/C, respectively) (negligible loss after 10000 accelerated test (ADT) cycles). The key factors...
The combination of n-type TiO<sub>2</sub> and p-type BiOCl photooxidizing water photoreducing the formed O<sub>2</sub> back to water, respectively, in acidic solution enabled a sustainable photofuel cell utilizing natural light.
We have succeeded in simultaneous operando time-resolved quick X-ray absorption fine structure (QXAFS)–X-ray diffraction (XRD) measurements at each acquisition time of 20 ms for a Pt/C cathode catalyst polymer electrolyte fuel cell (PEFC), while measuring the current/charge PEFC during transient voltage cyclic processes (0.4 VRHE → 1.4 0.4 VRHE) under H2(anode)–N2(cathode). The rate constants Pt–O bond formation/dissociation, Pt charging/discharging, Pt–Pt dissociation/reformation, and...
A gold-catalyzed cascade reaction of skipped diynes (1,4-diynes) and pyrroles has been developed. This proceeds by the consecutive regioselective hydroarylation two alkynes with a pyrrole, followed 7-endo-dig cyclization to give 1,6-dihydrocyclohepta[b]pyrroles in good yields. The direct synthesis cyclohepta[b]indoles using indole nucleophiles also reported.
It is hard to directly visualize spectroscopic and atomic-nanoscopic information on the degraded Pt/C cathode layer inside polymer electrolyte fuel cell (PEFC). However, it mandatory understand preferential area, sequence, relationship of degradations Pt nanoparticles carbon support in by observing catalyst for development next-generation PEFC catalysts. Here, spectroscopic, chemical, morphological visualization degradation electrocatalysts was performed successfully a same-view combination...
A total synthesis of (+)-conolidine has been achieved via the gold(I)-catalyzed cascade cyclization a conjugated enyne. Remarkably, this strategy allowed for simultaneous formation indole ring and ethylidene-substituted piperidine moiety under homogeneous gold catalysis in an enantioselective manner (88–91% ee).
We present evidence for long-range interfacial geometric interactions at metal–support interfaces by a combination of atomic scale and <italic>in situ</italic> characterizations.
Aldol reactions (self- and cross-aldol condensations) for conjugated enone synthesis were efficiently performed on large-sized Cs+ single sites (1 wt %) confined in β-zeolite channels toluene, which showed the highest level of catalytic aldol condensation activity among reported zeolite catalysts. In general, C-C bond can proceed by acids (e.g., H+), bases OH-), enolate species, acidic or basic solid However, site/β sample without significant acid-base property unprecedented, efficient,...
A photofuel cell comprising two photocatalysts TiO2 and Ag-TiO2 is demonstrated. The open circuit voltage, short current, maximum electric power of the PFC were 1.59 V, 74 μA, 14 μW, respectively. electron flow was rectified due to Schottky barrier between Ag nanoparticles.
A method enabling the accurate and precise correlation between structures properties is critical to development of efficient electrocatalysts. To this end, we developed an integrated single-electrode (ISM) that intimately couples electrochemical rotating disk electrodes, in situ/operando X-ray absorption fine structures, aberration-corrected transmission electron microscopy on identical electrodes. This all-in-one allows for one-to-one, situ/operando, atomic-scale electrocatalysts with their...
The well-known cumene process via an explosive hydroperoxide intermediate in liquid phase currently employed for phenol production is energy-intensive and not environmentally friendly. Therefore, there a demand alternative single-step gas-phase catalysis process. According to the conventional concept, selective oxidation reactions are promoted by redox catalysts acid–base catalysts. In general, alkali alkaline earth metal ions cannot activate each of benzene, O2, N2O when they adsorb...
We report the transformation of Cs+ ions with an inactive noble gas electronic structure to active single sites chemically confined in Y zeolite pores (Cs+/Y), which provides unprecedented catalysis for oxidative cyanation (ammoxidation) Csp3–H bonds O2 and NH3, although general, alkali alkaline earth metal without a moderate redox property cannot activate bonds. The Cs+/Y catalyst was proved be highly efficient synthesis aromatic nitriles yields >90% selective ammoxidation toluene its...
The design and synthesis of nanoscale zinc oxides (ZnOs) their applications to photocatalysis are widely explored. However, the photocatalytic controls needed appropriate crystalline faces promoter sites for each catalytic reaction step using ZnO have been rarely reported. This study optimized hydrogen purification preferential oxidation (PROX) CO impurities among disk-like, spheroidal, rod-like promoted by adsorbed Cu ions. Four key factors were examined: (1) diffusion length surface...
The doubly beneficial contribution of a nanoscale fabricated carbon surface and devised strong Pt-carbon interface to remarkable improvements Pt/carbon fuel cell electrodes was evidenced be crucial clue for rational design next-generation less-Pt/C electrodes. Real-world morphology metal-carbon interfaces are complex interrelated hard control at statistical level. Herein, we plasma-devised nanoneedles-glassy (GC) from well-defined flat GC as model supports, on which Pt nanoparticles were...