1. Fuel Cell Cutting‐edge Research Center (FC‐Cubic) Tokyo, 135‐0064 Japan
2. Research Institute for Energy Conservation (iECO), Department of Energy and EnvironmentThe National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki, 305‐8568 Japan
3. Toyota Central R&D Labs., Inc. Nagakute Aichi, 480‐1192 Japan