1. School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
2. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China
3. Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan 250013 China
4. Shandong Institutes of Industrial Technology Jinan 250102 China
5. University of Chinese Academy of Sciences Beijing 100049 China