Toshiaki Matsui

Nickel–yttria-stabilized zirconia (Ni–YSZ) cermet is a conventional anode for use in solid oxide fuel cells, and its composition and microstructure are carefully controlled to achieve high performance and long-term stability. In this study, the performance stability of the electrolyte-supported cell was examined at by feeding humidified fuel, . The influence of the cermet composition on degradation was also studied. The degradation behavior was significantly dependent on the fuel humidity and ce

The electrochemical oxidation of ammonia over Pt electrode in alkaline aqueous solutions was studied by in situ attenuated total reflection infrared (ATR-IR) spectroscopy. In 0.1 M NH3-1 M KOH, the band ascribable to the HNH bending mode of adsorbed NH3 was confirmed at 1662-1674 cm(-1) in the potential range of 0.1-1.1 V. The intensity of this band decreased continuously with a rise in potential, indicating the oxidative consumption of adsorbed ammonia. In response to this behavior, the band at

The proton-conductive electrolytes based on composites with various molar ratios were synthesized, and their structural and electrochemical properties were investigated at intermediate temperatures. The interfacial chemical reaction between and took place during the heat-treatment at 220°C, resulting in the formation of phase for the composition at . The resulting composites showed high proton conductivity with no conductivity jump inherent in , and the maximum conductivity achieved was at 272°C

The relation between the performance of direct ammonia-fueled SOFCs and the ammonia decomposition behavior over an anode was studied under various ammonia supply conditions.