1. College of Physics Qingdao University Qingdao 266071 P. R. China
2. Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) KAUST Solar Centre Thuwal 23955‐6900 Saudi Arabia
3. Department of Chemistry College of Science Hebei Agricultural University Baoding 071001 P. R. China
4. Centre for Clean Energy Technology School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney Broadway Sydney NSW 2007 Australia
5. Department of Chemical Engineering School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China
6. State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 P. R. China
7. School of Chemistry Xi'an Key Laboratory of Sustainable Energy Materials Chemistry MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 P. R. China