1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, United States
2. Joint Center for Energy Storage Research, Lemont, Illinois 60439, United States
3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
4. Department of Physics, Faculty of Science, National University of Singapore, S12 Science Drive 3, 117551 Singapore