1. College of Chemistry and Chemical Engineering, Institute for Sustainable Energy and Resources, Qingdao University, Qingdao 266071, Shandong, P. R. China
2. Liaoning Bora Bioenergy Co. Ltd, Panjin 124000, Liaoning, P. R. China
3. College of Physics, Qingdao University, Qingdao 266071, Shandong, P. R. China