1. Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao 266101 P. R. China
2. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100190 P. R. China
3. College of Materials Science and EngineeringQingdao University of Science and Technology Qingdao 266042 P. R. China
4. College of Chemistry and Molecular EngineeringQingdao University of Science and Technology Qingdao 266042 P. R. China
5. Key Laboratory for Renewable EnergyInstitute of PhysicsChinese Academy of Sciences Beijing 100190 P. R. China