1. Department of Building and Real Estate Research Institute for Sustainable Urban Development (RISUD) & Research Institute for Smart Energy (RISE) The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China
2. Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong 999077 P. R. China
3. School of Energy and Environment City University of Hong Kong Kowloon Hong Kong 999077 P. R. China
4. National Synchrotron Radiation Research Center Hsinchu Taiwan 300 China