1. International Institute for Carbon-Neutral Energy Research (I2CNER) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
2. Research Center for Sustainable Energy and Environmental Engineering Faculty of Engineering University of Miyazaki 1-1 Gakuenkibanadai Nishi 889-2192 Miyazaki Japan
3. Institute of Energy- and Climate Research IEK-1 Forschungszentrum Jülich GmbH 52425 Jülich Germany