1. Middle School Senior Teacher, Xishui No.1 Middle School, Hubei 438200, China.
2. Ph.D. Candidate, College of Energy Science and Engineering, Central South Univ., 932 Lushan South Rd., Changsha 410083, China (corresponding author).
3. Professor, College of Energy Science and Engineering, Central South Univ., 932 Lushan South Rd., Changsha 410083, China.