GU Quan1**, WANG Zhi-Qiang2, ZHANG Hang1, ZHAI Quan-Guo1, CAO Rui1, GAO Sheng-Li1**
1. School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China; 2. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China