1. Nanomaterials & System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju National University, Jeju 63243, Republic of Korea
2. Advanced Technology Institute, Department of Electrical and Electronics Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, England, Guildford GU2 7XH, United Kingdom
3. R&D Center for Energy New Industry, Jeju National University, Jeju 63243, Republic of Korea