1. Hydrogen Energy Materials Research Team, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
2. Department of Measurement Science, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
3. Department of Material Science and Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea