1. Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong P.R. China
2. Center of Nanomaterials for Renewable Energy (CNRE) State Key Lab of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P.R. China
3. School of Automotive and Traffic Engineering Jiangsu University of Technology Changzhou 213001 P.R. China