1. Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, P. R. China
2. Faculty of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
3. SDU-ANU Joint Science College, Shandong University, Weihai 264209, P. R. China
4. Materials Simulation and Modelling, Department of Applied Physics, and Center for Computational Energy Research, Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands