1. Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
2. Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
3. Department of Chemistry, School of Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
4. Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
5. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
6. JEOL Ltd., Akishima, Tokyo 196-8558, Japan