1. Department of Energy Conversion Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
2. Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan
3. Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China
4. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
5. Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan