1. Department of Materials Science and Engineering National University of Singapore Singapore 117574 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. National University of Singapore Suzhou Research Institute No. 377 Linquan Street, Suzhou Industrial Park Suzhou Jiangsu China