1. College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao Shandong 260042 P. R. China
2. Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Shandong Energy Institute Qingdao 266101 P. R. China
3. Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming Yunnan 650000 P. R. China
4. State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou 310027 China
5. Prof. H. Li, College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao 266061 P. R. China
6. School of Energy and Power Engineering Chongqing University Chongqing 400044 P. R. China