1. Center for Combustion Energy, Tsinghua University, Beijing 100084, China
2. School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
4. SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
5. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6315, United States