Award winner

Mr. KINO Yuki, Physical Science and Engineering Program, Department of Engineering
Mr. KOKETSU Daiki, Program of Materials Function and Design, Department of Engineering
Mr. KITO Kaito, Program of Materials Function and Design, Department of Engineering

（HOSHI Laboratory）

　

The 4th Asian Symposium on Electrochemical Impedance Spectroscopy (AEIS2024)
Poster Award

(AEIS2024)

Award-winning research

Mr. KINO "3D Impedance Analysis on Dissolution Behavior of Stainless Steel Covered with Oxide Thin Film in PEFC Simulated Environment"

Stainless steel is expected as a separator material for fuel cell stack components to reduce the cost of fuel cell vehicles. However, a surface treatment that provides both high corrosion resistance and low contact resistance is required from the viewpoint of the fuel cell operating environment and component bonding. In this study, a new surface treatment method using an oxide thin film on stainless steel separators was developed, and 3D impedance and contact resistance measurements revealed that stainless steel with an oxide thin film exhibits high corrosion resistance and low contact resistance.

Mr. KOKETSU "3D Impedance Measurement to Monitor Etching Rate on Metal-assisted Chemical Etching of Silicon Electrode with Deposited Silver Particles"

Silicon nanowires (SiNW), which is fabricated by metal-assisted chemical etching (MACE) on silicon with deposited silver (Ag) particles, are nano-silicon structures that are expected to be used in devices such as solar cells and lithium-ion batteries. However, the formation process of SiNW and the etching rate of MACE have not been clarified. In this study, we focused on electrochemical reactions in MACE and successfully monitored the etching rate by 3D impedance spectroscopy.

Mr. KITO "Impedance Analysis on Dissolution Behavior of Copper Tubes with Carbon Film"

Copper tube is widely used for heat-exchanger in air-conditioning system because of its high thermal conductivity. As the carbon film formed on the inner surface of the tube during manufacturing process may cause pitting corrosion, it is required to evaluate the amount of carbon film (residual carbon) adhered to the manufactured copper tube. In this study, the dissolution behavior of copper tube with carbon film was investigated by an electrochemical impedance spectroscopy to establish an evaluation method for residual carbon.

Mr. KOKETSU Daiki

I'm honored to receive this award at an international conference that presented a significant challenge for me. I'm deeply grateful for this valuable opportunity despite being only in my first year of the master's course. I would like to express my sincere gratitude to Associate Professor Yoshinao Hoshi for his generous guidance, as well as to Associate Professor Shinya Kato and all the members of our laboratory who have supported my research activities. I will continue to dedicate myself even more diligently to my research efforts.

Mr. KITO Kaito

I'm very honored to receive such a prestigious award. I would like to take this opportunity to thank my supervisor, Associate Professor Hoshi, my collaborators, and the members of my laboratory. Encouraged by this award, I will continue to make efforts in my research activities.