1. Ability R&D Energy Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong 999077, People’s Republic of China
2. Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
3. Department of Physics, College of Science, City University of Hong Kong, Hong Kong 999077, People’s Republic of China
4. Institute of Textile and Clothing, The Hong Kong Polytechnic University, Hong Kong, China
5. Department of Chemistry, College of Science, City University of Hong Kong, Hong Kong 999077, People’s Republic of China
6. Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Hong Kong 999077, People’s Republic of China