1. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering and Ningxia Key Laboratory for Photovoltaic Materials, Ningxia University, Yinchuan, Ningxia 750021, China
2. Department of Chemistry, University of California, Riverside, California 92521, United States
3. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China