[1] Kobe Univ, Fac Maritime Sci, Dept Maritime Transportat Syst, Kobe, Hyogo 6580022, Japan
[2] Natl Inst Adv Ind Sci & Technol, Adv Fuel Cell Res Grp, Res Inst Ubiquitos Energy Devices, Ikeda, Osaka 5638577, Japan
[3] Univ Hyogo, Grad Sch Engn, Dept Mat Sci & Chem, Himeji, Hyogo 6712101, Japan