1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore
2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, 174 Shazheng Main Street, Shapingba, Chongqing, 400044, China
3. NUS (Suzhou) Research Institute, No. 377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China
4. College of Engineering and Technology, Northeast Forestry University, Harbin, 150040, China