1. Principles of low-grade heat harvesting / Wei Li, Shiren Wang -- 2. Stretchable thermoelectric materials/devices for low-grade thermal energy harvesting / Tingting Sun, Lianjun Wang, Wan Jiang -- 3. Wearable power generation via thermoelectric textile / Yuanyuan Zheng, Chunhong Lu, Minzhi Du, Jilong Wang, Kun Zhang -- 4. Thermoelectric ionogel for low-grade heat harvesting / Wei Li, Santiago Garcia, Shiren Wang -- 5. Osmotic heat engines for low-grade thermal energy harvesting / Wei Li, Yuchen Liu, Shiren Wang -- 6. Liquid-based electrochemical systems for the conversion of heat to electricity / Shien-Ping Feng, Meng Ni, Chun Cheng, Sijia Wang -- 7. Liquid-state thermocells for low-grade heat harvesting / Jiangjiang Duan, Boyang Yu, Xinyan Zhuang, Hui Wang, Jun Zhou -- 8. Bimetallic thermally-regenerative ammonia batteries / Hua Tian, Weiguang Wang, Xiuping Zhu, Gequn Shu -- 9. Irom perchlorate electrolytes and nanocarbon electrodes related to the redox reaction / Ju Hyeon Kim, Tae June Kang -- 10. Thermal energy harvesting using thermomagnetic effect / Ravi Anant Kishore -- 11. Salt hydrate-based composite materials for thermochemical energy storage / Ruby-Jean Clark, Mohammed Farid.