1. Key Laboratory of Applied Chemistry in Hebei Province Yanshan University Qinhuangdao 066004 China
2. Institute of High Energy Physics Chinese Academy of Sciences 19B Yuquan Road, Shijingshan District Beijing P. R. China
3. Canadian Light Source 44 Innovation Boulevard Saskatoon SK S7N 2V3 Canada
4. Institute of Sustainable Energy Shanghai University Shanghai 200444 P. R. China
5. Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China
6. Department of Physics and Engineering Physics University of Saskatchewan Saskatoon SK S7N 5B2 Canada