1. Smart Energy Research Center School of Materials and Energy Guangdong University of Technology Guangzhou 510006 P. R. China
2. Department of Mechanical Engineering University of South Carolina Columbia SC 29208 USA
3. State Key Laboratory of Power Systems Department of Thermal Engineering Tsinghua University Beijing 100084 P. R. China
4. School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 P. R. China
5. Department of Building and Real Estate The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong P. R. China