1. Multidisciplinary Core Institute for Future EnergiesIncheon National University 119 Academy Rd., Yeonsu Incheon 22012 Republic of Korea
2. Department of Electrical EngineeringIncheon National University 119 Academy Rd., Yeonsu Incheon 22012 Republic of Korea
3. Department of Mechanical EngineeringIncheon National University 119 Academy Rd., Yeonsu Incheon 22012 Republic of Korea
4. School of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA 30332 USA