1. Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States
2. Center for Memory and Recording Research, University of California, San Diego, La Jolla, California 92093, United States
3. Center for Energy Research, University of California, San Diego, La Jolla, California 92093, United States
4. School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
5. Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
6. Sustainable Power and Energy Center (SPEC), University of California, San Diego, La Jolla, California 92093, United States
7. Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093, United States