1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117574, Singapore
2. MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
3. NUS Research Institute, No. 16 South Huashan Road, Liangjiang New Area, Chongqing 401123, China