1. Guangdong-Hong Kong Joint Laboratory for Water Security Engineering Research Center of Ministry of Education on Groundwater Pollution Control and Remediation Center for Water Research Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai Zhuhai 519087 P. R. China
2. Fachgebiet Angewandte Nanophysik Institut für Physik & IMN MacroNano Technische Universität Ilmenau 98693 Ilmenau Germany
3. Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 P. R. China
4. Fundamentals of Energy Materials Institute of Physics Technische Universität Ilmenau 98693 Ilmenau Germany
5. Department of Chemistry, Catalysts and Electrocatalysts group Technical University of Darmstadt 64287 Darmstadt Germany
6. Department of Chemistry Ernst-Berl-Institut für Technische und Makromolekulare Chemie Technical University of Darmstadt 64287 Darmstadt Germany