1. Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Stanford, California 94305, United States
2. Department of Material Science & Engineering, Stanford University, 440 Escondido Mall, Stanford, California 94305, United States
3. SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, California 94305, United States
4. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
6. Hewlett-Packard Laboratories, 1501 Page Mill Road, Palo Alto, California 94304, United States