Kyushu University · Engineering
Professor Kohei Ito's research lab specializes in advanced energy conversion and spintronic devices, focusing on optimizing energy efficiency in electrochemical systems and next-generation magnetic memory technologies. The lab investigates fundamental mechanisms in polymer electrolyte membrane water electrolysis, particularly hydrogen gas crossover and bubble dynamics, to enhance current efficiency through tailored surface wettability. Concurrently, the lab explores spintronic phenomena such as spin transfer torque switching with precessional motion, aiming to drastically reduce energy consumption in magnetic memory devices. These interdisciplinary efforts bridge materials science, nanomagnetism, and electrochemical engineering to develop sustainable and high-performance energy and information technologies.
Figures are computed from collected data and may differ slightly.
The authors have performed micromagnetic simulations of spin transfer torque (STT) switching, combined with precessional motion induced by a pulsed or static hard axis field. They have found a significant reduction in the current required for STT switching in the presence of precessional motion. In particular, the switching current can be reduced below the zero-temperature threshold current at dc, when the hard axis field exceeds a fourth of the free layer coercivity. The simulations indicate th
Hydrogen gas crossover, which reduces current efficiency, is critical issue in high pressure PEMWE (Polymer Electrolyte Membrane Water Electrolysis). This study proposes controlled wettability current collector, which enhances the detachment of hydrogen gas bubble from the current collector and decreases the crossover. A high pressure operation of a PEMWE cell with visualization clarified that the wettability impacts on the bubble dynamics and changes the current efficiency. Among the current co
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