1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
2. Hydrogen Research Department, Korea Institute of Energy Research (KIER), Daejeon 34129, Republic of Korea
3. Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea