1. Department of Materials Science and Engineering, University of California, Irvine, CA 92697, USA.
2. Department of Chemistry, University of California, Irvine, CA 92697, USA.
3. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.
4. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
5. Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, China.
6. Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai 200240, China.