1. Department of Mathematics and Physics Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery Luoyang Institute of Science and Technology Luoyang 471023 P. R. China
2. Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery Material Science and Engineering School Luoyang Institute of Science and Technology Luoyang 471023 P. R. China
3. College of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang 471023 P. R. China