A5056890919- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- Electrochemical Analysis and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Copper-based nanomaterials and applications
- Gas Sensing Nanomaterials and Sensors
- Metal-Catalyzed Oxygenation Mechanisms
- Fuel Cells and Related Materials
- Metal complexes synthesis and properties
- Transition Metal Oxide Nanomaterials
- CO2 Reduction Techniques and Catalysts
- Porphyrin and Phthalocyanine Chemistry
- Ionic liquids properties and applications
- Crystallography and molecular interactions
- Carbon dioxide utilization in catalysis
- Iron oxide chemistry and applications
- Chalcogenide Semiconductor Thin Films
- Electrochemical sensors and biosensors
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Arsenic contamination and mitigation
- Inorganic and Organometallic Chemistry
- Semiconductor materials and devices
Niigata University
2019-2025
Engineering (Italy)
2019
Niigata Institute of Technology
2019
Faculty (United Kingdom)
2019
Yale University
2016
Kyushu University
2016
The unprecedentedly low overpotential of 32 mV for oxygen evolution was attained by forming a unique motif NiS x nanowires stuffed into C 3 N 4 scabbards. With this system, electrocatalytic water splitting demonstrated at the lowest overall 72 mV.
Achieving a future sustainable carbon-neutral society requires efficient systems for water splitting to produce H 2 as alternatives fossil fuel. Prominent development of Ni-based oxygen-evolving electrocatalysts are reviewed.
The critical bottleneck for water splitting, which is important sustainable production of hydrogen, has remained in sluggish oxygen evolving reaction (OER) requiring insufficiently low overpotentials, η. We report a facile and versatile method the preparation loading-controllable metal oxide films adhered rigidly on electrode substrates, enabling effectual material hunting superior OER anodes. This allows us to discover ternary FeNiWOx film nickel foam (NF), attaining lowest overpotentials...
Abstract Artificial photosynthesis has attracted great attention as a viable way of converting and storing solar energy into chemical fuels. One the primary challenges in developing an efficient artificial photosynthetic system is to facilitate sluggish kinetics water oxidation. Molecular oxidation catalysts (WOCs) that are based on transition metals offer advantages catalytic activity tuning by rational ligand design mechanistic investigations mechanism through experimental theoretical...
A μ-oxido-bridged triruthenium complex (<bold>RuT2+</bold>), formed by air oxidation of a previously reported monoruthenium water-oxidation catalyst (WOC), serves as an efficient photochemical WOC with the turnover frequency (TOF) and number (TON) 0.90 s<sup>−1</sup> 610, respectively.
[Ru(Rtpy)(bpy)(H2O)]2+ (1R; bpy = 2,2′-bipyridine, and Rtpy 2,2′:6′,2″-terpyridine derivatives) complexes with a variety of 4′-substituent groups on were synthesized characterized to reveal the effects substituents their structures, physicochemical properties, catalytic activities for water oxidation. The geometric structures 1R are not considerably influenced by electron-donating ability Rtpy. Similar multistep proton-coupled electron transfer reactions observed 1R, redox potentials each...
A rigidly adhered nitrogen-doped BiVO4 photoanode with a narrow band gap energy (Eg = 2.35 eV) for water oxidation was developed to attain the IPCE value of 35.1% at 440 nm which is among highest reported values. This electrode provides very stable photocurrent density 3.3 mA cm–2 1.23 V vs RHE long term (at least 13.4 h) under visible light irradiation (100 mW cm–2).
Nickel-based materials are promising electrocatalysts for an alkaline oxygen evolution reaction (OER), which is indispensable developing water-splitting systems to produce hydrogen as a carbon-neutral fuel. Different NiOx films adhered rigidly on nickel foam (NF) and fluorine-doped tin oxide substrates were prepared via mixed metal-imidazole casting method from precursor solutions containing Ni salts with four different counter anions of SO42–, NO3–, Cl–, CH3COO– (Ac) in...
A photovoltaic (PV) device of double-junction GaAs/GaAs was customized to match up with the current density–voltage property an efficient electrolyzer a FeNiWOx/nickel foam (NF) anode and Pt/NF cathode. The customization PV resulted in perfect matching factor (MF = 99%) performances between for solar water splitting PV-electrolyzer (PVE) system. Efficient stable (one-month) high solar-to-hydrogen efficiency (STH) 13.9% demonstrated under 1 sun irradiation conditions. STH value is comparable...
Facile and scalable fabrication of α-Fe2O3 photoanodes using a precursor solution containing FeIII ions 1-ethylimidazole (EIm) in methanol was demonstrated to afford rigidly adhered film with controllable thickness on fluorine-doped tin oxide (FTO) substrate. EIm ligation the brought about high crystallinity three-dimensionally well-interconnected nanoparticles upon sintering. This is responsible for 13.6 times higher photocurrent density (at 1.23 V vs reference hydrogen electrode (RHE))...
A nitrogen-doped CuWO 4 (N-CuWO ) photoanode for photoelectrochemical (PEC) water oxidation was synthesized by a mixed metal-imidazole casting (MiMIC) method with 1-butylimidazole (BIm). The N-CuWO electrode attained PEC at...
Oxygen-evolution-reaction (OER) and oxygen-reduction-reaction (ORR) catalysts on a gas-diffusion carbon paper (CP) electrode have been explored as current hot topic. Low-cost earth-abundant FeNi (oxy)hydroxides the potential to be best-performing OER catalyst families. Here, we report Fe-rich FeNi-layered double-hydroxide (LDH) nanoflakes (Fe/Ni = 1:1.5 mol/mol) with sheet dimension of 10–20 nm bearing an increased number OER-active sites. An aqueous dispersion solution Prussian blue analog...
A unique transformation of WO3 nanowires (NW-WO3) into hexagonal prisms (HP-WO3) was demonstrated by tuning the temperature (N2H4)WO3 precursor suspension prepared from tungstic acid and hydrazine as a structure-directing agent. The preparation at 20 °C followed calcination 550 produced NW-WO3 nanocrystals (ca. <100 nm width, 3-5 μm length) with anisotropic growth monoclinic crystals to (002) (200) planes polycrystalline character randomly oriented crystallites in lateral face nanowires. 45...
A high performance for PEC water oxidation results from the formation of a p–n junction at interface between CoPi and α-Fe 2 O 3 , which is first observed among hitherto-reported /CoPi-based electrodes.
An anisotropically crystallized CuBi 2 O 4 (CuBi ( w )) film adhering rigidly on a fluorine doped tin oxide (FTO) electrode was prepared by mixed metal-imidazole casting (MiMIC) method using 1-methylimidazole (MeIm).
Nanorod architecture of a N2-intercalated WO3 photoanode has been developed by emphasizing the dual role N2H4, which functioned simultaneously as structure-directing agent and nitrogen source for in situ N2 intercalation. The N content WO3–N2H4 increased with increase calcination temperature from 350 to 420 °C thereafter decreased up 550 °C. This is different monotonously WO3–NH3. X-ray diffraction data indicated that phase-pure monoclinic crystals are formed over WO3–N2H4, contrast mixed...
A dinuclear Ru complex, proximal,proximal-[Ru2L(C8Otpy)2(OH)(OH2)]3+ (C8Otpy = 4′-octyloxy-2,2'; 6′,2″-terpyridine) (1) with long alkoxyl chains, was synthesized to be immobilized on a carbon paper (CP) electrode via hydrophobic interactions between the chains and CP surface. The 1/CP demonstrated efficient electrocatalytic water oxidation low overpotential (ηonset) of 0.26 V (based onset potential for oxidation) in an aqueous medium at pH 7.0, which is compared advantageously those...
A Pt cathode (Pt( w -MeIm)) prepared by a mixed metal-imidazole casting (MiMIC) method showed remarkably superior hydrogen evolution reaction (HER) performance compared to the without imidazole / o -MeIm)), and common Pt-based benchmark cathodes of Pt/C or plate.
A new mononuclear Ru aquo complex [Ru(C8Otpy)(H2dcbpy)(OH2)]2+ with 4,4'-dicarboxy-2,2'-bipyridine (H2dcbpy) and 4'-octyloxy-2,2':6',2''-terpyridine (C8Otpy) ligands was synthesized to investigate electrocatalytic water oxidation by the immobilized on a mesoporous indium-doped tin oxide (meso-ITO) electrode using multi-potential-step chronocoulospectrometric (MPSCCS) technique. UV-visible absorption spectroscopic data indicated that [Ru(C8Otpy)(dcbpy)(OH2)] (RuOH2) is deprotonated...
A non-heme Fe complex with a tetradentate dicarboxamide N4 in-plane ligand works efficiently and selectively for the electrocatalytic CO2-to-CO conversion in homogeneous DMF solution. The was immobilized on nitrogen-doped graphene (N-G) to achieve neutral aqueous NaHCO3 solutions, affording CO Faradaic efficiency of 90%, current density 6 mA cm–2, turnover frequency 2.1 s–1, at an overpotential 0.47 V, which is among those hitherto-reported efficient selective complexes electrocatalysts.