1. School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332 USA
2. Sila Nanotechnologies, Inc.; Atlanta GA 30332 USA
3. School of Metallurgy and Environment; Central South University; Changsha 410083 P. R. China
4. Department of Inorganic Chemistry; Dresden University of Technology; Bergstr. 66 Dresden 01069 Germany
5. Center for Energy Convergence; Korea Institute of Science and Technology; Cheongryang Seoul 130-650 South Korea
6. Electrochemistry Branch; Army Research Laboratory; Adelphi MD 20783 USA