1. Carbon Resources Institute; Korea Research Institute of Chemical Technology (KRICT); 141 Gajeong-ro, Yuseong-gu Daejeon 34114 South Korea
2. School of Materials Science and Engineering; Gwangju Institute of Science and Technology (GIST); 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 South Korea
3. Division of Electron Microscopic Research Group; Korea Basic Science Institute (KBSI); 169-148 Gwahak-ro, Yuseong-gu Daejeon 34133 South Korea
4. Department of Chemical Engineering; Pohang University of Science and Technology (POSTECH); 77 Cheongam-Ro, Nam-gu Pohang 37673 South Korea