Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by King Abdullah University of Science and Technology (KAUST), and part of this work was supported by Saudi Arabia Basic Industries Corporation (SABIC) grant RGC/3/2470-01. The work at U Nebraska was partly supported by the U. S. Department of Energy through grant #DE-FG02-07ER15842. This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility under Contract No. DE-AC02-06CH11357. DFT calculations (ZH, DL, and TSR) were performed at the UCF Advanced Research Computing Center and partially supported by NSF grant CHE-1310327. We thank Sampyo Hong for fruitful discussions.