A5052719274- Electrocatalysts for Energy Conversion
- Advancements in Solid Oxide Fuel Cells
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- Ammonia Synthesis and Nitrogen Reduction
- Electronic and Structural Properties of Oxides
- Nanomaterials for catalytic reactions
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Catalysts for Methane Reforming
- Gas Sensing Nanomaterials and Sensors
- Catalysis and Oxidation Reactions
- Advanced Photocatalysis Techniques
- Semiconductor materials and devices
- Catalysis and Hydrodesulfurization Studies
- Magnetic and transport properties of perovskites and related materials
- Polyoxometalates: Synthesis and Applications
- CO2 Reduction Techniques and Catalysts
- Transition Metal Oxide Nanomaterials
- Electrical and Thermal Properties of Materials
- High-Temperature Coating Behaviors
- Chemical Synthesis and Characterization
- Hydrogen Storage and Materials
- Carbon dioxide utilization in catalysis
Kyoto University
2003-2021
Graduate School USA
2016
Panasonic (Japan)
2011-2012
Takeda (Japan)
2011
University of Yamanashi
2011
In recent years, solid oxide fuel cells fueled with ammonia have been attracting intensive attention. this work, was supplied to the Ni/yttria-stabilized zirconia (YSZ) cermet anode at 600 and 700 °C, change of electrochemical performance microstructure under open-circuit state studied in detail. The influence exposure on Ni also investigated by using Ni/YSZ powder film deposited a YSZ disk. obtained results demonstrated that partially nitrided an atmosphere, which considerably roughened...
Abstract Ammonia decomposition has attracted the interest of many researchers as a promising process for on‐site generation H 2 . In this study, Ni catalysts supported on various rare‐earth oxides were prepared by impregnation method and employed ammonia decomposition. The Ni/Y O 3 catalyst exhibited best performance among samples investigated. reaction kinetics study indicated that most oxide supports effective alleviation hydrogen inhibition phenomenon in reaction. desorption behavior...
The electrochemical oxidation of ammonia over Pt electrode in alkaline aqueous solutions was studied by situ attenuated total reflection infrared (ATR-IR) spectroscopy. In 0.1 M NH3-1 KOH, the band ascribable to HNH bending mode adsorbed NH3 confirmed at 1662-1674 cm(-1) potential range 0.1-1.1 V. intensity this decreased continuously with a rise potential, indicating oxidative consumption ammonia. response behavior, 1269 appeared alternatively above 0.2 V, and its reached local maximal...
Abstract Several solid oxide fuel cell (SOFC) systems can be considered for the NH 3 utilization. In this study, catalytic activity and long‐term stability of decomposition reactor with Ni/Y 2 O ‐based catalysts autothermal cracker Co–Ce–Zr composite catalyst were investigated. Moreover, combined SOFC stack their performances compared to those fueled H /N . The power output each was over 200 W. it demonstrated that direct ‐fueled stable 1,000 h at 770 °C without significant degradation.
The recent development of anion exchange membranes (AEMs) has increased the potential membrane fuel cells (AEMFCs). Although highly active electrocatalysts for specific reactions have been successfully developed by placing most importance on species, only a few studies focused OHad (hydroxyl adsorbed species), which is known to be common reactive species in alkaline environments. In this study, oxophilic CeO2 was selected as surface modifier Pt electrode. We first applied situ attenuated...
In this study, Ni/BaCe0.75Y0.25O3−δ (Ni/BCY25) was investigated as an anode for direct ammonia-fueled solid oxide fuel cells. The catalytic activity of Ni/BCY25 ammonia decomposition found to be remarkably higher than Ni/8 mol % Y2O3–ZrO2 and Ni/Ce0.90Gd0.10O1.95. poisoning effect water hydrogen on reaction over evaluated. addition, electrolyte-supported SOFC employing BaCe0.90Y0.10O3−δ (BCY10) electrolyte fabricated, its electrochemical performance at 550–650 °C with supply gases. content...
Co, Ni, and Fe-added Mo nitrides for ammonia decomposition facilitated the recombinative desorption of N atoms from active components.
The recent development of anion exchange membranes (AEMs) has increased the potential and importance ammonia as a fuel for membrane cells (AEMFCs). Although electrocatalysts oxidation using Pt-based alloy catalysts have been developed recently, no obvious activity enhancement was reported. In this paper, electrocatalytic rare earth oxide (RO: CeO2, Y2O3, La2O3, Sm2O3) modified Pt reaction investigated in alkaline aqueous solutions. enhanced accordance with amount OHad species on electrode...
Abstract Recently, the promising prospect of ammonia as a hydrogen carrier for solid oxide fuel cells (SOFCs) has attracted significant interests. In this work, effects temperature, content, and total flow rate anode gas on performance Ni/yttria‐stabilized zirconia (Ni/YSZ) ammonia‐fueled SOFCs were investigated. Based obtained results, utilization route Ni/YSZ was discussed; results electrochemical experiments related with catalytic decomposition bahavior over Ni/YSZ. Moreover, activity...
The stability of poly(arylene ether sulfone ketone) (SPESK) multiblock copolymer membranes having highly sulfonated hydrophilic blocks was tested in an operating fuel cell. electrochemical properties and drain water were monitored during the test, followed by post-test analyses membrane. During a 2000-h cell operation test at 80 °C 53% RH (relative humidity) with constant current density (0.2 A cm(-2)), voltage showed minor losses, slight increases resistance. In water, anions such as...
The addition of Sr/Ba species enhanced ammonia conversion Ni/Y<sub>2</sub>O<sub>3</sub> since these additives promoted nitrogen desorption from Ni metal.
In this study the electrochemical performances of Ni–YSZ anode in humidified H2, NH3 and CH4 fuels were compared under almost same partial pressure oxygen at 500–800°C. The cell performance was significantly affected by fuel species operating temperature. single exhibited higher wet as with that CH4, which caused difference catalytic activity for hydrogen production CH4. Thus, it clarified is a preferable rather than direct use SOFCs. Furthermore, kinetics on ammonia decomposition over...
The performance of nickel–based anode materials for solid oxide fuel cells (SOFCs) could be deteriorated by redox treatments accompanied with the microstructural change. In this study, Ni–yttria-stabilized zirconia (Ni–YSZ) was subjected to thermal cycles (thermal–redox cycles: repetition oxidation in cooling and reduction heating processes). change anodes quantified focused ion beam–scanning electron microscopy. decrement active triple phase boundary (TPB) length caused sintering...
In this study, the heteropolyacids of H3+xPVxMO12-xO40 (x = 0, 2, and 3) were applied as redox mediators for oxygen reduction reaction in polymer electrolyte fuel cells, which cathode is free from usage noble metals such Pt/C. system, electrochemical heteropolyacid over carbon subsequent reoxidation partially reduced by exposure to dissolved regenerator are important processes continuous power generation. Thus, properties catholytes containing these investigated detail. The substitution...
We present the difference between adsorbed intermediates on Pt and those Pd during 2-propanol oxidation in alkaline media.
Recently, the strong chemical interaction between Ni and GDC (Gd2O3−CeO2) was reported for cermet anode of Ni−GDC in solid oxide fuel cells (SOFCs);1 CeO2 species migrated on surface after exposure to reducing atmosphere. This modification nickel affected catalytic properties carbon deposition CO adsorption. Generally, such a is promoted by oxidation-reduction (redox) treatment. In this study, then, influence redox treatment electrochemical Ni–GDC cermets investigated detail establish new...