1. Energy Process Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
2. Hydrogen Energy Research Center, Guangzhou Power Supply Bureau, Guangdong Power Grid Company Limited, Guangzhou, Guangdong 510620, China
3. Materials for Energy Conversion and Storage, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
4. Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology (QST), 1-1-1 Kouto, Sayo-cho,
Sayo-gun, 679-5148 Hyogo, Japan