1. Institute of Photoelectronic Thin Film Devices and Technology Solar Energy Research Center Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology Renewable Energy Conversion and Storage Center Nankai University Tianjin 300350 China
2. School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
3. Department of Interface Science Fritz-Haber-Institut der Max-Planck-Gesellschaft 14195 Berlin Germany
4. Institute of Electrochemistry University of Alicante 03080 Alicante Spain
5. State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China