1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong, China
2. Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong, China
3. The Energy Institute, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong, China