[1] Kyung Hee Univ, Dept Chem Engn, FCC, Yongin 446701, Gyeonggi Do, South Korea
[2] Incheon Natl Univ, Dept Phys, Inchon 406772, South Korea
[3] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea
[4] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, Gyungbuk, South Korea