1. Core Technology R&D Center NSK Ltd Kanagawa Japan
2. Department of Mechanical Engineering Fukuoka University Fukuoka Japan
3. Department of Mechanical Engineering Kyushu University Fukuoka Japan
4. International Institute for Carbon‐Neutral Energy Research (I2CNER) Kyushu University Fukuoka Japan
5. AIST‐Kyushu University Hydrogen Materials Laboratory (HydroMate) Fukuoka Japan